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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2016	Apr. 25, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Entity Registrant Name	U.S. Silica Holdings, Inc.
Entity Central Index Key	0001524741
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		63,501,408

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 463,395	$ 277,077
Short-term investments	6,840	21,849
Accounts receivable, net	59,078	58,706
Inventories, net	67,091	65,004
Prepaid expenses and other current assets	10,375	9,921
Income tax deposits	939	6,583
Total current assets	607,718	439,140
Property, plant and mine development, net	553,005	561,196
Goodwill	68,647	68,647
Trade names	14,474	14,474
Customer relationships, net	6,329	6,453
Other assets	18,127	18,709
Total assets	1,268,300	1,108,619
Current Liabilities:
Accounts payable	45,394	49,631
Dividends payable	3,339	3,453
Accrued liabilities	11,547	11,708
Accrued interest	57	58
Current portion of long-term debt	3,333	3,330
Current portion of deferred revenue	7,216	15,738
Total current liabilities	70,886	83,918
Long-term debt	487,540	488,375
Deferred revenue	66,948	59,676
Deferred revenue	60,600	55,893
Deferred income taxes, net	9,770	19,513
Other long-term obligations	17,563	17,077
Total liabilities	713,307	724,452
Stockholders’ Equity:
Preferred Stock, Value, Outstanding	0	0
Common stock	639	539
Additional paid-in capital	379,336	194,670
Retained earnings	207,040	220,974
Treasury stock, at cost	(13,323)	(15,845)
Accumulated other comprehensive loss	(18,699)	(16,171)
Total stockholders’ equity	554,993	384,167
Total liabilities and stockholders’ equity	$ 1,268,300	$ 1,108,619

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Sales	$ 122,510	$ 203,958
Cost of goods sold (excluding depreciation, depletion and amortization)	106,751	138,653
Operating expenses
Selling, general and administrative	15,503	26,961
Depreciation, depletion and amortization	14,556	13,243
Total operating expenses	30,059	40,204
Operating income (loss)	(14,300)	25,101
Other income (expense)
Interest expense	(6,643)	(6,836)
Other income, net, including interest income	1,790	11
Total other (expenses) income	(4,853)	(6,825)
Income (loss) before income taxes	(19,153)	18,276
Income tax benefit (expense)	8,493	(3,453)
Net income (loss)	$ (10,660)	$ 14,823
Earnings (loss) per share:
Basic (in usd per share)	$ (0.20)	$ 0.28
Diluted (in usd per share)	$ (0.20)	$ 0.28
Weighted Average Number of Shares Outstanding, Basic	54,470	53,416
Weighted Average Number of Shares Outstanding, Diluted	54,470	53,869
Common stock cash dividend declared, per share	$ 0.0625	$ 0.13

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (10,660)	$ 14,823
Other comprehensive income (loss):
Unrealized gain on derivatives (net of tax of $21and $2 for the three months ended March 31, 2016 and 2015, respectively)	35	3
Unrealized gain (loss) on investments (net of tax of $(3) and $22 for the three months ended March 31, 2016 and 2015, respectively)	(5)	35
Pension and other post-retirement benefits liability adjustment (net of tax of $(1,541) and $(235) for the three months ended March 31, 2016 and 2015, respectively)	(2,558)	(379)
Comprehensive income (loss)	$ (13,188)	$ 14,482

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on derivatives, tax	$ 21	$ 2
Unrealized gain (loss) on investments, tax	(3)	22
Pension and other post-retirement benefits liability adjustment, tax	$ (1,541)	$ (235)

Condensed Consolidated Statements of Stockholders' Equity - 3 months ended Mar. 31, 2016 - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance at December 31, 2015 at Dec. 31, 2015	$ 384,167	$ 539	$ (15,845)	$ 194,670	$ 220,974	$ (16,171)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(10,660)				(10,660)
Issuance of common stock (common stock offering at $20 per share, net of issuance costs of $13,798)	186,202	100		186,102
Unrealized gain on derivatives, net of tax	35					35
Unrealized loss on short-term investments, net of tax	(5)					(5)
Pension and post-retirement liability, net of tax	(2,558)					(2,558)
Cash dividend declared ($0.0625 per share)	(3,274)				(3,274)
Equity-based compensation	1,906			1,906
Net tax effect	(343)			(343)
Proceeds from options exercised	22		37	(15)
Shares withheld for employee taxes related to vested restricted stock and stock units	(499)		1,416	(1,915)
Issuance of restricted stock	0		1,069	(1,069)
Balance at March 31, 2016 at Mar. 31, 2016	$ 554,993	$ 639	$ (13,323)	$ 379,336	$ 207,040	$ (18,699)

Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) $ in Thousands	Mar. 22, 2016 $ / shares
Statement of Stockholders' Equity [Abstract]
Sale of Stock, Price Per Share	$ 20

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net income (loss)	$ (10,660)	$ 14,823
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	14,556	13,243
Debt issuance amortization	348	352
Original issue discount amortization	96	96
Deferred income taxes	(8,563)	(3,101)
Deferred revenue	(1,250)	(5,498)
Gain (loss) on disposal of property, plant and equipment	8	(32)
Equity-based compensation	1,906	2,090
Excess tax benefit from equity-based compensation	0	(6)
Bad debt provision net of recoveries	150	3,183
Other	653	(552)
Changes in operating assets and liabilities:
Accounts receivable	(522)	21,343
Inventories	(2,087)	1,677
Prepaid expenses and other current assets	(454)	(1,512)
Income taxes	5,644	5,742
Accounts payable and accrued liabilities	(4,398)	(33,071)
Accrued interest	(1)	0
Liability for pension and other post-retirement benefits	820	1,007
Net cash provided by (used in) operating activities	(3,754)	19,784
Investing activities:
Capital expenditures	(6,068)	(13,377)
Maturities of short-term investments	15,020	0
Proceeds from sale of property, plant and equipment	58	72
Net cash provided by (used in) investing activities	9,010	(13,305)
Financing activities:
Dividends paid	(3,388)	(6,758)
Repurchase of common stock	0	(15,255)
Proceeds from Issuance of Common Stock	200,000	0
Payments of Stock Issuance Costs	(13,798)	0
Proceeds from options exercised	22	43
Excess tax benefit from equity-based compensation	0	6
Tax payments related to shares withheld for vested restricted stock	(499)	(443)
Repayment of long-term debt	(1,275)	(1,275)
Payments of Financing Costs	0	(64)
Net cash provided by (used in) financing activities	181,062	(23,746)
Net increase (decrease) in cash and cash equivalents	186,318	(17,267)
Cash and cash equivalents, beginning of period	277,077	263,066
Cash and cash equivalents, end of period	463,395	245,799
Cash paid (received) during the period for:
Interest	5,298	5,529
Taxes, net of refunds	$ (5,574)	$ 805

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	NOTE A—SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation and Consolidation The accompanying Condensed Consolidated Financial Statements (the “Financial Statements”) of U.S. Silica Holdings, Inc. (“Holdings,” and together with its subsidiaries “we,” “us” or the “Company”) included in this Quarterly Report on Form 10-Q, have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X issued by the U.S. Securities and Exchange Commission (“SEC”). They do not contain certain information included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2015; therefore, the interim Condensed Consolidated Financial Statements should be read in conjunction with that Annual Report on Form 10-K. In the opinion of management, all adjustments necessary for a fair presentation of the Financial Statements have been included. Such adjustments are of a normal, recurring nature. We have reclassified certain immaterial amounts in the prior years’ operating activities section of the consolidated statement of cash flows to conform to the current year presentation. These reclassifications had no effect on previously reported net cash flows from operations. In order to make this report easier to read, we refer throughout to (i) our Condensed Consolidated Balance Sheets as our “Balance Sheets,” (ii) our Condensed Consolidated Statements of Operations as our “Income Statements,” and (iii) our Condensed Consolidated Statements of Cash Flows as our “Cash Flows.” Unaudited Interim Financial Statements The accompanying Balance Sheet as of March 31, 2016; the Income Statements, Condensed Consolidated Statements of Comprehensive Income and Cash Flows for the three months ended March 31, 2016 and 2015; the Condensed Consolidated Statements of Stockholders' Equity for the three months ended March 31, 2016; and other information disclosed in the related notes are unaudited. The Balance Sheet as of December 31, 2015 was derived from our audited consolidated financial statements as included in our 2015 Annual Report. Use of Estimates and Assumptions The preparation of the Financial Statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the related disclosure of contingent assets and liabilities at the date of the Financial Statements and the reported amounts of revenues and expenses during the reporting period. The more significant areas requiring the use of management estimates and assumptions relate to mineral reserves that are the basis for future cash flow estimates utilized in impairment calculations and units-of-production amortization calculations; environmental, reclamation and closure obligations; estimates of recoverable minerals; estimates of allowance for doubtful accounts; estimates of fair value for certain reporting units and asset impairments (including impairments of goodwill and other long-lived assets); write-downs of inventory to net realizable value; equity-based compensation expense; post-employment, post-retirement and other employee benefit liabilities; valuation allowances for deferred tax assets; reserves for contingencies and litigation; and the fair value and accounting treatment of financial instruments including derivative instruments. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Accordingly, actual results may differ significantly from these estimates under different assumptions or conditions. Recently Issued Accounting Pronouncements In March 2016, the Financial Accounting Standards Board ("FASB") issued an Accounting Standards Update, Improvements to Employee Share-Based Payment Accounting, which simplifies the income tax consequences, accounting for forfeitures and classification on the Statements of Cash Flows. This Update is effective for public entities for financial statements issued for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years; early application is permitted. We are currently evaluating the effect that the new guidance will have on our financial statements and related disclosures. In February 2016, the FASB issued an Accounting Standards Update, Leases, which supersedes the existing lease guidance and requires all leases with a term greater than 12 months to be recognized on the balance sheet as assets and obligations. This Update is effective for public entities for financial statements issued for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years; early application is permitted. This standard mandates a modified retrospective transition method. We are currently evaluating the effect that the new guidance will have on our financial statements and related disclosures. On July 22, 2015, the FASB issued Accounting Standards Update, Simplifying the Measurement of Inventory. The new standard requires an entity to measure most inventory at the lower of cost and net realizable value, thereby simplifying the current guidance under which an entity must measure inventory at the lower of cost or market. The new standard will not apply to inventories that are measured using either the last-in, first-out (LIFO) method or the retail inventory method. This Update is effective for public entities for financial statements issued for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years; early application is permitted. We have elected to adopt the standard early effective January 1, 2016 prospectively and have measured our inventory at the lower of cost and net realizable value on our Balance Sheet as of March 31, 2016.

Capital Structure and Accumulated Comprehensive Income

3 Months Ended

Mar. 31, 2016

Equity [Abstract]

Capital Structure and Accumulated Comprehensive Income

NOTE B—CAPITAL STRUCTURE AND ACCUMULATED COMPREHENSIVE INCOME

Common Stock

Our Amended and Restated Certificate of Incorporation authorizes up to 500,000,000 shares of common stock, par value of $0.01. Subject to the rights of holders of any series of preferred stock, all of the voting power of the stockholders of Holdings shall be vested in the holders of the common stock.

In March 2016, we completed a public offering of 10,000,000 shares of our common stock for total cash proceeds of approximately $186.2 million net of underwriting discounts and offering costs. There were 63,481,699 shares of common stock issued and outstanding at March 31, 2016. As of March 31, 2015, there were 53,374,963 shares issued and outstanding.

During the three months ended March 31, 2016, our Board of Directors declared quarterly cash dividends as follows:



Dividends per Common Share		Declaration Date	Record Date	Payable Date
$	0.06	February 22, 2016	March 15, 2016	April 5, 2016

All dividends were paid as scheduled.

Any determination to pay dividends and other distributions in cash, stock, or property by Holdings in the future will be at the discretion of our Board of Directors and will be dependent on then-existing conditions, including our business conditions, our financial condition, results of operations, liquidity, capital requirements, contractual restrictions including restrictive covenants contained in our debt agreements, and other factors. Additionally, because we are a holding company, our ability to pay dividends on our common stock may be limited by restrictions on the ability of our subsidiaries to pay dividends or make distributions to us, including restrictions under the terms of the agreements governing our indebtedness.

Preferred Stock

Our Amended and Restated Certificate of Incorporation authorizes our Board of Directors to issue up to 10,000,000 shares, in the aggregate, of preferred stock, par value of $0.01 in one or more series, to fix the powers, preferences and other rights of such series, and any qualifications, limitations or restrictions thereof, including the dividend rate, conversion rights, voting rights, redemption rights and liquidation preference, and to fix the number of shares to be included in any such series, without any further vote or action by our stockholders.

There were no shares of preferred stock issued or outstanding at either March 31, 2016 or December 31, 2015. At present, we have no plans to issue any preferred stock.

Employee Stock Awards

We grant stock options, restricted stock, restricted stock units and performance share units to our employees and directors under the Amended and Restated U.S. Silica Holdings, Inc. 2011 Incentive Compensation Plan. The weighted-average stock awards (in thousands) that are antidilutive and are therefore excluded from the calculation of our diluted earnings per common share are:



	Three Months Ended March 31,
	2016	2015
Weighted-average outstanding stock options excluded	1,306	306
Weighted-average outstanding restricted stock awards excluded	367	27

Share Repurchase Program

We are authorized by our Board of Directors to repurchase shares of our outstanding common stock from time to time on the open market or in privately negotiated transactions. As of March 31, 2016, we are authorized to repurchase up to $50 million of our common stock through December 11, 2016. Stock repurchases, if any, will be funded using our available liquidity. The timing and amount of stock repurchases will depend on a variety of factors, including the market conditions as well as corporate and regulatory considerations. Under our share repurchase program, as of March 31, 2016, we have repurchased 706,093 shares of our common stock at an average price of $23.83 and are authorized to repurchase up to an additional $33.2 million of our common stock.

Accumulated Other Comprehensive Income

Accumulated other comprehensive income (loss) consists of fair value adjustments associated with cash flow hedges and accumulated adjustments for net experience losses and prior service cost related to employee benefit plans. The following table presents the changes in accumulated other comprehensive income by component during the three months ended March 31, 2016:



	For the Three Months Ended March 31, 2016
	Unrealized gain/(loss) on cash flow hedges			Unrealized gain/(loss) on short-term investments			Pension and other post-retirement benefits liability			Total
Beginning Balance	$	(81	)	$	6		$	(16,096	)	$	(16,171	)
Other comprehensive income (loss) before reclassifications	—			(5		)	(2,947		)	(2,952		)
Amounts reclassed from accumulated other comprehensive income	35			—			389			424
Ending Balance	$	(46	)	$	1		$	(18,654	)	$	(18,699	)

Amounts reclassified from accumulated other comprehensive income (loss) related to cash flow hedges category are included in interest expense in our Income Statements and amounts reclassified related to pension and other post-retirement benefits liability category are included in the computation of net periodic pension costs, respectively, at before tax amounts.

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

+ Details

Accounts Receivable

3 Months Ended

Mar. 31, 2016

Receivables [Abstract]

Accounts Receivable

NOTE C—ACCOUNTS RECEIVABLE

At March 31, 2016 and December 31, 2015, accounts receivable (in thousands) consisted of the following:



	March 31, 2016			December 31, 2015
Trade receivables	$	65,279		$	64,821
Less: Allowance for doubtful accounts	(7,503		)	(7,686		)
Net trade receivables	57,776			57,135
Other receivables	1,302			1,571
Total accounts receivable	$	59,078		$	58,706

Changes in our allowance for doubtful accounts (in thousands) during the three months ended March 31, 2016 are as follows:



	March 31, 2016
Beginning balance	$	7,686
Bad debt provision net of recoveries	150
Write-offs	(333		)
Ending balance	$	7,503

Inventories

3 Months Ended

Mar. 31, 2016

Inventory Disclosure [Abstract]

Inventories

NOTE D—INVENTORIES

At March 31, 2016 and December 31, 2015, inventories (in thousands) consisted of the following:



	March 31, 2016		December 31, 2015
Supplies	$	18,114	$	18,029
Raw materials and work in process	16,493		18,113
Finished goods	32,484		28,862
Total inventories	$	67,091	$	65,004

Property, Plant and Mine Development

3 Months Ended

Mar. 31, 2016

Property, Plant and Equipment [Abstract]

Property, Plant and Mine Development

NOTE E—PROPERTY, PLANT AND MINE DEVELOPMENT

At March 31, 2016 and December 31, 2015, property, plant and mine development (in thousands) consisted of the following:



	March 31, 2016			December 31, 2015
Mining property and mine development	$	222,427		$	222,439
Asset retirement cost	9,887			9,889
Land	30,322			30,322
Land improvements	37,972			37,791
Buildings	51,280			51,280
Machinery and equipment	368,353			360,817
Furniture and fixtures	1,917			1,917
Construction-in-progress	53,867			56,130
	776,025			770,585
Accumulated depletion, depreciation and amortization	(223,020		)	(209,389		)
Total property, plant and mine development, net	$	553,005		$	561,196

The amount of interest costs capitalized in property, plant and equipment was $90 and $42 for the three months ended March 31, 2016 and 2015 respectively.

Debt

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Debt

NOTE F—DEBT

At March 31, 2016 and December 31, 2015, debt (in thousands) consisted of the following:



	March 31, 2016			December 31, 2015
Senior secured credit facility:
Revolver expiring July 23, 2018 (5% at March 31, 2016 and December 31, 2015)	$	—		$	—
Term loan facility—final maturity July 23, 2020 (4 - 4.5% at March 31, 2016 and December 31, 2015)	498,000			499,275
Less: Unamortized original issue discount	(1,602		)	(1,696		)
Less: Unamortized debt issuance cost	(5,525		)	(5,874		)
Total debt	490,873			491,705
Less: current portion	(3,333		)	(3,330		)
Total long-term portion of debt	$	487,540		$	488,375

Revolving Line-of-Credit

We have a $50 million revolving line-of-credit (the “Revolver”), with zero drawn and $3.3 million allocated for letters of credit as of March 31, 2016, leaving $46.7 million available under the Revolver.

Debt Maturities

At March 31, 2016, contractual maturities of long-term debt (in thousands) are as follows:



2016	$	3,825
2017	5,100
2018	5,100
2019	5,100
2020	478,875
Thereafter	—
	$	498,000

Our senior secured credit facility is secured by substantially all of our assets and a pledge of the equity interests in certain of our subsidiaries. The facility contains covenants that, among other things, govern our ability to create, incur or assume indebtedness and liens, to make acquisitions or investments, to pay dividends and to sell assets. The facility also requires us to maintain a consolidated total net leverage ratio of no more than 3.75:1.00 as of the last day of any fiscal quarter whenever usage of the Revolver (other than certain undrawn letters of credit) exceeds 25% of the Revolver commitment. As of March 31, 2016, we are in compliance with all covenants in accordance with our senior secured credit facility.

Asset Retirement Obligations

3 Months Ended

Mar. 31, 2016

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations

NOTE G—ASSET RETIREMENT OBLIGATIONS

Mine reclamation costs, or future remediation costs for inactive mines, are accrued based on management’s best estimate at the end of each period of the costs expected to be incurred at a site. Such cost estimates include, where applicable, ongoing care, maintenance and monitoring costs. Changes in estimates at inactive mines are reflected in earnings in the period an estimate is revised.

As of March 31, 2016, we had a liability of $12.5 million in other long-term obligations related to our asset retirement obligation. Changes in the asset retirement obligation (in thousands) during the three months ended March 31, 2016 are as follows:



	March 31, 2016
Beginning balance	$	12,254
Payments	—
Accretion	240
Additions and revisions of prior estimates	—
Ending balance	$	12,494

Fair Value Accounting

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Accounting

NOTE H—FAIR VALUE ACCOUNTING

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

Level 1—Quoted prices in active markets for identical assets or liabilities.

Level 2—Observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3—Inputs that are generally unobservable and typically reflect management’s estimate of assumptions that market participants would use in pricing the asset or liability.

Cash Equivalents

Due to the short-term maturity, we believe our cash equivalent instruments at March 31, 2016 and December 31, 2015 approximate their reported carrying values.

Short-Term Investments

In general, the fair value of our short-term investments is based on quoted prices for similar assets in active markets, or for identical assets or similar assets in markets in which there were fewer transactions (Level 2). Money market mutual funds are based on calculated net asset value and are reported in Level 1. Variable rate demand obligations underwritten and remarketed by a financial institution are priced at par value.

Long-Term Debt, Including Current Maturities

We believe that the fair values of our long-term debt, including current maturities, approximate their carrying values based on their effective interest rates compared to current market rates.

Derivative Instruments

The estimated fair value of our derivative assets (interest rate caps) are recorded at each reporting period and are based upon widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative contract. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. We also incorporate credit valuation adjustments to appropriately reflect both our nonperformance risk as well as that of the respective counterparty in the fair value measurements.

Although we have determined that the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default of ourselves and our counterparties. However, as of March 31, 2016, we have assessed that the impact of the credit valuation adjustments on the overall valuation of our derivative positions is not significant. As a result, we have determined that our derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

In accordance with the fair value hierarchy, the following table presents the fair value as of March 31, 2016 of those assets (in thousands) that we measure at fair value on a recurring basis:



	Level 1		Level 2		Total
Short-term investments	$	982	$	5,858	$	6,840
Interest rate derivatives	—		—		—
Net asset	$	982	$	5,858	$	6,840

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Short-Term Investments

3 Months Ended

Mar. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Short-Term Investments

NOTE I—SHORT-TERM INVESTMENTS

We have segregated funds into designated accounts with investment brokers who manage our short-term investment portfolio. Those funds are held on an available-for-sale basis and are therefore reported at fair value on the balance sheet. The following table summarizes our available-for-sale short-term investments (in thousands) as of March 31, 2016:



	Aggregate Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Money market mutual funds	$	982	$	—	$	—	$	982
Fixed income securities:
Certificates of deposit	4,655		—		—		4,655
Government agencies	1,200		3		—		1,203
Total available-for-sale investments	$	6,837	$	3	$	—	$	6,840

As of March 31, 2016, we considered any declines in market value of our short-term investment portfolio to be temporary in nature and did not consider any of our investments other-than-temporarily impaired. We typically invest in highly-rated securities, and our investment policy generally limits the amount of credit exposure to any one issuer. The policy requires investments generally to be investment grade, with the primary objective of minimizing the potential risk of principal loss. Fair values were determined for each individual security in the investment portfolio. When evaluating an investment for other-than-temporary impairment, we review factors such as the length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer and any changes thereto, changes in market interest rates, and our intent to sell, or whether it is more likely than not it will be required to sell, the investment before recovery of the investment’s cost basis. As of March 31, 2016, we did not recognize any impairment charges.

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

Commitments and Contingencies

3 Months Ended

Mar. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE J—COMMITMENTS AND CONTINGENCIES

Future Minimum Annual Commitments at March 31, 2016:



(amounts in thousands)	Operating Lease Minimum Rental Payments		Minimum Purchase Commitments
2016	$	33,721	$	22,109
2017	46,960		19,861
2018	57,211		17,222
2019	52,363		12,967
2020	48,687		4,258
Thereafter	157,427		14,850
Total future lease and purchase commitments	$	396,369	$	91,267

Operating Leases

We are obligated under certain operating leases for railroad cars, office space, mining property, mining/processing equipment and transportation and other equipment. Certain operating lease agreements include options to purchase the equipment for fair market value at the end of the original lease term. In general, the above leases include renewal options and provide that we pay for all utilities, insurance, taxes and maintenance. Expense related to operating leases and rental agreements totaled approximately $12.9 million and $10.0 million for the three months ended March 31, 2016 and 2015, respectively. As of March 31, 2016, we have no obligations under a capital lease.

Minimum Purchase Commitments

We enter into service agreements with our transload service providers and transportation service providers. Some of these agreements require us to purchase a minimum amount of services over a specific period of time. Any inability to meet these minimum contract requirements requires us to pay a shortfall fee, which is based on the difference between the minimum amount contracted for and the actual amount purchased.

Other Commitments and Contingencies

Our operating subsidiary, U.S. Silica Company (“U.S. Silica”), has been named as a defendant in various product liability claims alleging silica exposure causing silicosis. During the three months ended March 31, 2016, no new claims were brought against U.S. Silica. As of March 31, 2016, there were 75 active silica-related products liability claims pending in which U.S. Silica is a defendant. Although the outcomes of these claims cannot be predicted with certainty, in the opinion of management, it is not reasonably possible that the ultimate resolution of these matters will have a material adverse effect on our financial position or results of operations that exceeds the accrual amounts.

We have recorded estimated liabilities for these claims in other long-term obligations as well as estimated recoveries under the indemnity agreement and an estimate of future recoveries under insurance in other assets on our consolidated balance sheets. As of both March 31, 2016 and December 31, 2015 other non-current assets included $0.3 million for insurance for third-party products liability claims and other long-term obligations included $1.5 million in third-party products claims liability.

Additionally, during the three months ended March 31, 2015, we received an unfavorable ruling in an arbitration proceeding as a result of exiting a toll manufacturing contract. The amount of the ruling was approximately $7.6 million. The matter was settled and the settlement amount of $6.5 million was paid on June 9, 2015. The expense was included in selling, general and administrative expense in our Income Statement for the three months ended March 31, 2015.

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	NOTE K—INCOME TAXES For interim period reporting, we record income taxes using an estimated annual effective tax rate based upon projected annual income, forecasted permanent tax differences, discrete items and statutory rates in states in which we operate. At the end of each interim period, we update the estimated annual effective tax rate, and if the estimated tax rate changes based on new information, we make a cumulative adjustment in the period. We record the tax effect of an unusual or infrequently occurring item in the interim period in which it occurs as a discrete item of tax. The effective tax rate was 44% and 19% for the three months ended March 31, 2016 and 2015, respectively. Historically, our actual effective tax rates have differed from the statutory effective rate primarily due to the benefit received from statutory percentage depletion allowances. The deduction for statutory percentage depletion does not necessarily change proportionately to changes in income before income taxes.

Pension and Post-Retirement Benefits

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Pension and Post-Retirement Benefits

NOTE L—PENSION AND POST-RETIREMENT BENEFITS

We maintain a single-employer noncontributory defined benefit pension plan covering certain employees. Net pension benefit cost (in thousands) recognized for the three months ended March 31, 2016 and 2015 are as follows:



	Three Months Ended March 31,
	2016			2015
Service cost	$	288		$	324
Interest cost	1,235			1,203
Expected return on plan assets	(1,392		)	(1,375		)
Net amortization and deferral	481			666
Net pension benefit costs	$	612		$	818

In addition, we provide defined benefit post-retirement health care and life insurance benefits to some employees. Net periodic post-retirement benefit cost (in thousands) recognized for the three months ended March 31, 2016 and 2015 are as follows:



	Three Months Ended March 31,
	2016		2015
Service cost	$	44	$	44
Interest cost	306		277
Expected return on plan assets	—		(1		)
Net amortization and deferral	135		96
Net post-retirement costs	$	485	$	416

The weighted average discount rate used to determine the projected pension and post-retirement obligations was updated during the three months ended March 31, 2016, and was decreased from 4.5% at December 31, 2015 to 4.1% at March 31, 2016. We made no contributions to the qualified pension plan for the three months ended March 31, 2016 and 2015. Total expected employer funding contributions during the fiscal year ending December 31, 2016 are $0 for the pension plan and $1.4 million for the post-retirement medical and life plan.

Obligations under Guarantees	3 Months Ended
Obligations under Guarantees	Mar. 31, 2016
Guarantees [Abstract]
Obligations Under Guarantees	NOTE M—OBLIGATIONS UNDER GUARANTEES We have indemnified Travelers Casualty and Surety Company of America (“Travelers”) against any loss Travelers may incur in the event that holders of surety bonds, issued on behalf of us by Travelers, execute the bonds. As of March 31, 2016, Travelers had $10.2 million in bonds outstanding for us. The majority of these bonds, $9.9 million, relate to reclamation requirements issued by various governmental authorities. Reclamation bonds remain outstanding until the mining area is reclaimed and the authority issues a formal release. The remaining bonds relate to such indefinite purposes as licenses, permits, and tax collection.

Segment Reporting

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Segment Reporting

NOTE N—SEGMENT REPORTING

Our business is organized into two reportable segments, Oil & Gas Proppants and Industrial & Specialty Products, based on end markets. The reportable segments are consistent with how management views the markets that we serve and the financial information reviewed by the chief operating decision maker. We manage our Oil & Gas Proppants and Industrial & Specialty Products businesses as components of an enterprise for which separate information is available and is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assess performance.

In the Oil & Gas Proppants segment, we serve the oil and gas recovery market by providing fracturing sand, or “frac sand,” which is pumped down oil and natural gas wells to prop open rock fissures and increase the flow rate of oil and natural gas from the wells.

The Industrial & Specialty Products segment consists of over 260 products and materials used in a variety of industries, including container glass, fiberglass, specialty glass, flat glass, building products, fillers and extenders, foundry products, chemicals, recreation products and filtration products.

An operating segment’s performance is primarily evaluated based on segment contribution margin, which excludes certain corporate costs not associated with the operations of the segment. These corporate costs are separately stated below and include costs that are related to functional areas such as operations management, corporate purchasing, accounting, treasury, information technology, legal and human resources. We believe that segment contribution margin, as defined above, is an appropriate measure for evaluating the operating performance of our segments. However, this measure should be considered in addition to, not a substitute for, or superior to, income from operations or other measures of financial performance prepared in accordance with generally accepted accounting principles. The other accounting policies of each of the two reporting segments are the same as those in Note A - Summary of Significant Accounting Policies of our Financial Statements.

The following table presents sales and segment contribution margin (in thousands) for the reporting segments and other operating results not allocated to the reported segments for the three months ended March 31, 2016 and 2015:



	Three Months Ended March 31,
	2016			2015
Sales:
Oil & Gas Proppants	$	73,865		$	148,753
Industrial & Specialty Products	48,645			55,205
Total Sales	122,510			203,958
Segment contribution margin:
Oil & Gas Proppants	851			52,195
Industrial & Specialty Products	16,893			15,456
Total segment contribution margin	17,744			67,651
Operating activities excluded from segment cost of goods sold	(1,985		)	(2,346		)
Selling, general and administrative	(15,503		)	(26,961		)
Depreciation, depletion and amortization	(14,556		)	(13,243		)
Interest expense	(6,643		)	(6,836		)
Other income, net, including interest income	1,790			11
Income (loss) before income taxes	$	(19,153	)	$	18,276

Asset information, including capital expenditures and depreciation, depletion, and amortization, by segment is not included in reports used by management in its monitoring of performance and, therefore, is not reported by segment. Goodwill of $68.6 million has been allocated to these segments with $47.9 million assigned to Oil & Gas Proppants and $20.7 million to Industrial & Specialty Products.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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-Name Accounting Standards Codification
-Topic 280
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	NOTE O—SUBSEQUENT EVENTS On April 5, 2016 we paid a cash dividend of $0.0625 per share to common stockholders of record on March 15, 2016, which had been declared by our Board of Directors on February 22, 2016.

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2016
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The accompanying Condensed Consolidated Financial Statements (the “Financial Statements”) of U.S. Silica Holdings, Inc. (“Holdings,” and together with its subsidiaries “we,” “us” or the “Company”) included in this Quarterly Report on Form 10-Q, have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X issued by the U.S. Securities and Exchange Commission (“SEC”). They do not contain certain information included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2015; therefore, the interim Condensed Consolidated Financial Statements should be read in conjunction with that Annual Report on Form 10-K. In the opinion of management, all adjustments necessary for a fair presentation of the Financial Statements have been included. Such adjustments are of a normal, recurring nature. We have reclassified certain immaterial amounts in the prior years’ operating activities section of the consolidated statement of cash flows to conform to the current year presentation. These reclassifications had no effect on previously reported net cash flows from operations. In order to make this report easier to read, we refer throughout to (i) our Condensed Consolidated Balance Sheets as our “Balance Sheets,” (ii) our Condensed Consolidated Statements of Operations as our “Income Statements,” and (iii) our Condensed Consolidated Statements of Cash Flows as our “Cash Flows.”
Unaudited Interim Financial Statements	Unaudited Interim Financial Statements The accompanying Balance Sheet as of March 31, 2016; the Income Statements, Condensed Consolidated Statements of Comprehensive Income and Cash Flows for the three months ended March 31, 2016 and 2015; the Condensed Consolidated Statements of Stockholders' Equity for the three months ended March 31, 2016; and other information disclosed in the related notes are unaudited. The Balance Sheet as of December 31, 2015 was derived from our audited consolidated financial statements as included in our 2015 Annual Report.
Use of Estimates and Assumptions	Use of Estimates and Assumptions The preparation of the Financial Statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the related disclosure of contingent assets and liabilities at the date of the Financial Statements and the reported amounts of revenues and expenses during the reporting period. The more significant areas requiring the use of management estimates and assumptions relate to mineral reserves that are the basis for future cash flow estimates utilized in impairment calculations and units-of-production amortization calculations; environmental, reclamation and closure obligations; estimates of recoverable minerals; estimates of allowance for doubtful accounts; estimates of fair value for certain reporting units and asset impairments (including impairments of goodwill and other long-lived assets); write-downs of inventory to net realizable value; equity-based compensation expense; post-employment, post-retirement and other employee benefit liabilities; valuation allowances for deferred tax assets; reserves for contingencies and litigation; and the fair value and accounting treatment of financial instruments including derivative instruments. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Accordingly, actual results may differ significantly from these estimates under different assumptions or conditions.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In March 2016, the Financial Accounting Standards Board ("FASB") issued an Accounting Standards Update, Improvements to Employee Share-Based Payment Accounting, which simplifies the income tax consequences, accounting for forfeitures and classification on the Statements of Cash Flows. This Update is effective for public entities for financial statements issued for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years; early application is permitted. We are currently evaluating the effect that the new guidance will have on our financial statements and related disclosures. In February 2016, the FASB issued an Accounting Standards Update, Leases, which supersedes the existing lease guidance and requires all leases with a term greater than 12 months to be recognized on the balance sheet as assets and obligations. This Update is effective for public entities for financial statements issued for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years; early application is permitted. This standard mandates a modified retrospective transition method. We are currently evaluating the effect that the new guidance will have on our financial statements and related disclosures. On July 22, 2015, the FASB issued Accounting Standards Update, Simplifying the Measurement of Inventory. The new standard requires an entity to measure most inventory at the lower of cost and net realizable value, thereby simplifying the current guidance under which an entity must measure inventory at the lower of cost or market. The new standard will not apply to inventories that are measured using either the last-in, first-out (LIFO) method or the retail inventory method. This Update is effective for public entities for financial statements issued for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years; early application is permitted. We have elected to adopt the standard early effective January 1, 2016 prospectively and have measured our inventory at the lower of cost and net realizable value on our Balance Sheet as of March 31, 2016.

Capital Structure and Accumulated Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2016

Equity [Abstract]

Schedule of Quarterly Cash Dividends

three months ended March 31, 2016, our Board of Directors declared quarterly cash dividends as follows:



Dividends per Common Share		Declaration Date	Record Date	Payable Date
$	0.06	February 22, 2016	March 15, 2016	April 5, 2016

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The weighted-average stock awards (in thousands) that are antidilutive and are therefore excluded from the calculation of our diluted earnings per common share are:



	Three Months Ended March 31,
	2016	2015
Weighted-average outstanding stock options excluded	1,306	306
Weighted-average outstanding restricted stock awards excluded	367	27

Changes in Accumulated Other Comprehensive Income

The following table presents the changes in accumulated other comprehensive income by component during the three months ended March 31, 2016:



	For the Three Months Ended March 31, 2016
	Unrealized gain/(loss) on cash flow hedges			Unrealized gain/(loss) on short-term investments			Pension and other post-retirement benefits liability			Total
Beginning Balance	$	(81	)	$	6		$	(16,096	)	$	(16,171	)
Other comprehensive income (loss) before reclassifications	—			(5		)	(2,947		)	(2,952		)
Amounts reclassed from accumulated other comprehensive income	35			—			389			424
Ending Balance	$	(46	)	$	1		$	(18,654	)	$	(18,699	)

Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2016

Receivables [Abstract]

Schedule of Accounts Receivable

At March 31, 2016 and December 31, 2015, accounts receivable (in thousands) consisted of the following:



	March 31, 2016			December 31, 2015
Trade receivables	$	65,279		$	64,821
Less: Allowance for doubtful accounts	(7,503		)	(7,686		)
Net trade receivables	57,776			57,135
Other receivables	1,302			1,571
Total accounts receivable	$	59,078		$	58,706

Changes in our allowance for doubtful accounts (in thousands) during the three months ended March 31, 2016 are as follows:



	March 31, 2016
Beginning balance	$	7,686
Bad debt provision net of recoveries	150
Write-offs	(333		)
Ending balance	$	7,503

Inventories (Tables)

3 Months Ended

Mar. 31, 2016

Inventory Disclosure [Abstract]

Schedule of Inventories

At March 31, 2016 and December 31, 2015, inventories (in thousands) consisted of the following:



	March 31, 2016		December 31, 2015
Supplies	$	18,114	$	18,029
Raw materials and work in process	16,493		18,113
Finished goods	32,484		28,862
Total inventories	$	67,091	$	65,004

Property, Plant and Mine Development (Tables)

3 Months Ended

Mar. 31, 2016

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Mine Development

At March 31, 2016 and December 31, 2015, property, plant and mine development (in thousands) consisted of the following:



	March 31, 2016			December 31, 2015
Mining property and mine development	$	222,427		$	222,439
Asset retirement cost	9,887			9,889
Land	30,322			30,322
Land improvements	37,972			37,791
Buildings	51,280			51,280
Machinery and equipment	368,353			360,817
Furniture and fixtures	1,917			1,917
Construction-in-progress	53,867			56,130
	776,025			770,585
Accumulated depletion, depreciation and amortization	(223,020		)	(209,389		)
Total property, plant and mine development, net	$	553,005		$	561,196

Debt (Tables)

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Schedule of Debt

At March 31, 2016 and December 31, 2015, debt (in thousands) consisted of the following:



	March 31, 2016			December 31, 2015
Senior secured credit facility:
Revolver expiring July 23, 2018 (5% at March 31, 2016 and December 31, 2015)	$	—		$	—
Term loan facility—final maturity July 23, 2020 (4 - 4.5% at March 31, 2016 and December 31, 2015)	498,000			499,275
Less: Unamortized original issue discount	(1,602		)	(1,696		)
Less: Unamortized debt issuance cost	(5,525		)	(5,874		)
Total debt	490,873			491,705
Less: current portion	(3,333		)	(3,330		)
Total long-term portion of debt	$	487,540		$	488,375

Schedule of Contractual Maturities of Debt

At March 31, 2016, contractual maturities of long-term debt (in thousands) are as follows:



2016	$	3,825
2017	5,100
2018	5,100
2019	5,100
2020	478,875
Thereafter	—
	$	498,000

Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2016

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Changes in Asset Retirement Obligation

Changes in the asset retirement obligation (in thousands) during the three months ended March 31, 2016 are as follows:



	March 31, 2016
Beginning balance	$	12,254
Payments	—
Accretion	240
Additions and revisions of prior estimates	—
Ending balance	$	12,494

Fair Value Accounting (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Schedule of Measure at Fair Value on Recurring Basis

In accordance with the fair value hierarchy, the following table presents the fair value as of March 31, 2016 of those assets (in thousands) that we measure at fair value on a recurring basis:



	Level 1		Level 2		Total
Short-term investments	$	982	$	5,858	$	6,840
Interest rate derivatives	—		—		—
Net asset	$	982	$	5,858	$	6,840

Short-Term Investments (Tables)

3 Months Ended

Mar. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Summary of Available-for-Sale Short-Term Investments

The following table summarizes our available-for-sale short-term investments (in thousands) as of March 31, 2016:



	Aggregate Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Money market mutual funds	$	982	$	—	$	—	$	982
Fixed income securities:
Certificates of deposit	4,655		—		—		4,655
Government agencies	1,200		3		—		1,203
Total available-for-sale investments	$	6,837	$	3	$	—	$	6,840

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Annual Commitments

Future Minimum Annual Commitments at March 31, 2016:



(amounts in thousands)	Operating Lease Minimum Rental Payments		Minimum Purchase Commitments
2016	$	33,721	$	22,109
2017	46,960		19,861
2018	57,211		17,222
2019	52,363		12,967
2020	48,687		4,258
Thereafter	157,427		14,850
Total future lease and purchase commitments	$	396,369	$	91,267

Pension and Post-Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Summarizes Information about Pension and Post-Retirement Benefit Plans



	Three Months Ended March 31,
	2016			2015
Service cost	$	288		$	324
Interest cost	1,235			1,203
Expected return on plan assets	(1,392		)	(1,375		)
Net amortization and deferral	481			666
Net pension benefit costs	$	612		$	818



	Three Months Ended March 31,
	2016		2015
Service cost	$	44	$	44
Interest cost	306		277
Expected return on plan assets	—		(1		)
Net amortization and deferral	135		96
Net post-retirement costs	$	485	$	416

Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Presentation of Sales and Segment Contribution Margin for Reporting Segments and Other Operating Results



	Three Months Ended March 31,
	2016			2015
Sales:
Oil & Gas Proppants	$	73,865		$	148,753
Industrial & Specialty Products	48,645			55,205
Total Sales	122,510			203,958
Segment contribution margin:
Oil & Gas Proppants	851			52,195
Industrial & Specialty Products	16,893			15,456
Total segment contribution margin	17,744			67,651
Operating activities excluded from segment cost of goods sold	(1,985		)	(2,346		)
Selling, general and administrative	(15,503		)	(26,961		)
Depreciation, depletion and amortization	(14,556		)	(13,243		)
Interest expense	(6,643		)	(6,836		)
Other income, net, including interest income	1,790			11
Income (loss) before income taxes	$	(19,153	)	$	18,276

Capital Structure and Accumulated Comprehensive Income (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 22, 2016	Mar. 31, 2015
Capital Structure And Accumulated Comprehensive Income (Loss)
SecondaryOfferingShares		10,000,000
Dividends Payable, Date Declared	Feb. 22, 2016
Issuance of common stock	$ 186,202,000
Common stock issued (shares)	64,007,899		53,374,963
Common stock outstanding (shares)	63,481,699		53,374,963
Preferred stock issued (shares)	0		0
Preferred stock outstanding (shares)	0		0
Authorization to repurchase common stock	$ 50,000,000
Repurchase of common stock (shares)	706,093
Average price per common share of repurchase common stock (in USD per share)	$ 23.83
Remaining authorized repurchase of common stock amount	$ 33,200,000
Common Stock
Capital Structure And Accumulated Comprehensive Income (Loss)
Common stock authorized (shares)	500,000,000
Common stock, par value	$ 0.01
Preferred Stock
Capital Structure And Accumulated Comprehensive Income (Loss)
Preferred stock authorized (shares)	10,000,000
Preferred stock, par value	$ 0.01

Capital Structure and Accumulated Comprehensive Income - Schedule of Quarterly Cash Dividends (Details) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Equity [Abstract]
Common stock cash dividend declared, per share	$ 0.0625	$ 0.13
Dividends Payable, Date Declared	Feb. 22, 2016
Record date	Mar. 15, 2016
Payable date	Apr. 05, 2016

Capital Structure and Accumulated Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (16,171)
Other comprehensive income (loss) before reclassifications	(2,952)
Amounts reclassed from accumulated other comprehensive income	424
Ending Balance	(18,699)
Unrealized Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(81)
Other comprehensive income (loss) before reclassifications	0
Amounts reclassed from accumulated other comprehensive income	35
Ending Balance	(46)
Unrealized Gain/(Loss) on Short-Term Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	6
Other comprehensive income (loss) before reclassifications	(5)
Amounts reclassed from accumulated other comprehensive income	0
Ending Balance	1
Pension and Other Postretirement Benefits Liability
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(16,096)
Other comprehensive income (loss) before reclassifications	(2,947)
Amounts reclassed from accumulated other comprehensive income	389
Ending Balance	$ (18,654)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References + Details

Capital Structure and Accumulated Comprehensive Income The weighted-average stockawards (in thousands) that are antidilutive to EPS (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,306	0
Restricted Stock and Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	367	0

Business Combination (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Business Acquisition
Goodwill	$ 68,647	$ 68,647

Business Combination - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Business Acquisition
Goodwill	$ 68,647	$ 68,647

Accounts Receivable - Schedule of Accounts Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Trade receivables	$ 65,279	$ 64,821
Less: Allowance for doubtful accounts	(7,503)	(7,686)
Net trade receivables	57,776	57,135
Other receivables	1,302	1,571
Total accounts receivable	$ 59,078	$ 58,706

Accounts Receivable - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Allowance for Doubtful Accounts Receivable
Beginning balance	$ 7,686
Bad debt provision net of recoveries	150	$ 3,183
Write-offs	(333)
Ending balance	$ 7,503

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Supplies	$ 18,114	$ 18,029
Raw materials and work in process	16,493	18,113
Finished goods	32,484	28,862
Total inventories	$ 67,091	$ 65,004

Property, Plant and Mine Development (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Property, Plant and Equipment
Interest Costs Capitalized	$ 90	$ 42

Property, Plant and Mine Development - Schedule of Property, Plant and Mine Development (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Property, Plant and Equipment
Interest Costs Capitalized	$ 90	$ 42
Property, plant and mine development	776,025		$ 770,585
Accumulated depletion, depreciation and amortization	(223,020)		(209,389)
Total property, plant and mine development, net	553,005		561,196
Mining Property and Mine Development
Property, Plant and Equipment
Property, plant and mine development	222,427		222,439
Asset Retirement Cost
Property, Plant and Equipment
Property, plant and mine development	9,887		9,889
Land
Property, Plant and Equipment
Property, plant and mine development	30,322		30,322
Land Improvements
Property, Plant and Equipment
Property, plant and mine development	37,972		37,791
Buildings
Property, Plant and Equipment
Property, plant and mine development	51,280		51,280
Machinery and Equipment
Property, Plant and Equipment
Property, plant and mine development	368,353		360,817
Furniture and Fixtures
Property, Plant and Equipment
Property, plant and mine development	1,917		1,917
Construction-in-Progress
Property, Plant and Equipment
Property, plant and mine development	$ 53,867		$ 56,130

Debt (Detail)	3 Months Ended
Debt (Detail)	Mar. 31, 2016 USD ($)
Short-term Debt
Credit facility consolidated total net leverage ratio	0.0375
Net leverage ratio, credit facility threshold (percentage)	25.00%
Revolving Line-of-Credit
Short-term Debt
Available borrowing base	$ 50,000,000
Amount drawn from borrowing base	0
Amount available for general corporate use under this revolving credit agreement	46,700,000
Letter of Credit
Short-term Debt
Amount allocated for letters of credit	$ 3,300,000

Debt - Schedule of Debt (Detail) - USD ($) $ in Thousands	3 Months Ended
Debt - Schedule of Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Line of Credit Facility
Less: Unamortized debt issuance cost	$ (5,525)	$ (5,874)
Total debt	490,873	491,705
Less: current portion	(3,333)	(3,330)
Total long-term portion of debt	487,540	488,375
Revolving Line-of-Credit
Line of Credit Facility
Total debt	$ 0	$ 0
Credit facility, maturity date	Jul. 23, 2018
Credit facility, interest rate	5.00%	5.00%
Term Loan Facility
Line of Credit Facility
Less: Unamortized original issue discount	$ (1,602)	$ (1,696)
Total debt	$ 498,000	$ 499,275
Credit facility, maturity date	Jul. 23, 2020

Debt - Schedule of Contractual Maturities of Debt (Detail) $ in Thousands	Mar. 31, 2016 USD ($)
Debt Disclosure [Abstract]
2015	$ 3,825
2016	5,100
2017	5,100
2018	5,100
2019	478,875
Thereafter	0
Total debt	$ 498,000

Asset Retirement Obligations (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligation	$ 12,494	$ 12,254

Asset Retirement Obligations - Schedule of Changes in Asset Retirement Obligation (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Asset Retirement Obligation Disclosure [Abstract]
Beginning balance	$ 12,254
Payments	0
Accretion	240
Additions and revisions of prior estimates	0
Ending balance	$ 12,494

Fair Value Accounting - Schedule of Measure at Fair Value on Recurring Basis (Detail) - Measured at Fair Value on Recurring Basis $ in Thousands	Mar. 31, 2016 USD ($)
Defined Benefit Plan Disclosure
Short-term investments	$ 6,840
Interest rate derivatives	0
Net asset	6,840
Level 1
Defined Benefit Plan Disclosure
Short-term investments	982
Interest rate derivatives	0
Net asset	982
Level 2
Defined Benefit Plan Disclosure
Short-term investments	5,858
Interest rate derivatives	0
Net asset	$ 5,858

Short-Term Investments (Detail)	3 Months Ended
Short-Term Investments (Detail)	Mar. 31, 2016 USD ($)
Investments, Debt and Equity Securities [Abstract]
Impairment charges	$ 0

Short-Term Investments - Schedule of Available-for-Sale Short-Term Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities
Aggregate Cost	$ 6,837
Gross Unrealized Gains	3
Gross Unrealized Losses	0
Fair Value	6,840	$ 21,849
Money Market Mutual Funds
Schedule of Available-for-sale Securities
Aggregate Cost	982
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	982
Certificates Of Deposit
Schedule of Available-for-sale Securities
Aggregate Cost	4,655
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	4,655
Government Agencies
Schedule of Available-for-sale Securities
Aggregate Cost	1,200
Gross Unrealized Gains	3
Gross Unrealized Losses	0
Fair Value	$ 1,203

Commitments and Contingencies (Detail) $ in Thousands	3 Months Ended
Commitments and Contingencies (Detail) $ in Thousands	Mar. 31, 2016 USD ($) claim	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Insurance [Abstract]
Expenses related to operating leases and rental agreements	$ 12,900	$ 10,000
New claims filed \| claim	0
Third party products claims liability under insurance in other assets	$ 300		$ 311
Third party products claims liability under insurance in other long-term obligations	1,500		$ 1,500
Selling, General and Administrative Expense
Loss Contingencies
Litigation settlement expense	7,600
Payments for Legal Settlements	$ 6,500

Commitments and Contingencies - Schedule of Future Minimum Annual Commitments (Details) $ in Thousands	Mar. 31, 2016 USD ($)
Operating Leases
2015	$ 33,721
2016	46,960
2017	57,211
2018	52,363
2019	48,687
Thereafter	157,427
Total future lease commitments	396,369
Minimum Purchase Commitments
2015	22,109
2016	19,861
2017	17,222
2018	12,967
2019	4,258
Thereafter	14,850
Total future purchase commitments	$ 91,267

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Mar. 31, 2016	Mar. 31, 2015
Loss Contingencies
Effective income tax rate	44.00%	19.00%
Selling, General and Administrative Expense
Loss Contingencies
Litigation settlement expense	$ 7.6

Pension and Post-Retirement Benefits (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Pension Benefits
Defined Benefit Plan Disclosure
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.50%	4.10%
Expected contributions in current fiscal year	$ 0.0
Post-retirement Benefits
Defined Benefit Plan Disclosure
Expected contributions in current fiscal year	$ 1.4

Pension and Post-Retirement Benefits - Summarizes Information about Pension and Post-Retirement Benefit Plans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Pension Benefits
Defined Benefit Plan Disclosure
Service cost	$ 288	$ 324
Interest cost	1,235	1,203
Expected return on plan assets	(1,392)	(1,375)
Net amortization and deferral	481	666
Net pension benefit costs	612	818
Post-retirement Benefits
Defined Benefit Plan Disclosure
Service cost	44	44
Interest cost	306	277
Expected return on plan assets	0	(1)
Net amortization and deferral	135	96
Net pension benefit costs	$ 485	$ 416

Obligations Under Guarantees (Detail) - Travelers Casualty and Surety Company $ in Millions	Mar. 31, 2016 USD ($)
Surety Bonds
Loss Contingencies
Surety bonds outstanding	$ 10.2
Reclamation Bonds
Loss Contingencies
Bonds related to reclamation requirements	$ 9.9

Segment Reporting (Detail) $ in Thousands	3 Months Ended
Segment Reporting (Detail) $ in Thousands	Mar. 31, 2016 USD ($) Segment Product	Dec. 31, 2015 USD ($)
Segment Reporting Information
Number of reportable segments \| Segment	2
Number of products in Industrial & Specialty segment (over 260) \| Product	260
Goodwill	$ 68,647	$ 68,647
Industrial & Specialty Products segment description	Over 260 products and materials used in a variety of industries including, container glass, fiberglass, specialty glass, flat glass, building products, fillers and extenders, foundry products, chemicals, recreation products and filtration products.
Oil & Gas Proppants
Segment Reporting Information
Goodwill	$ 47,900
Industrial & Specialty Products
Segment Reporting Information
Goodwill	$ 20,700

Segment Reporting - Presentation of Sales and Segment Contribution Margin for Reporting Segments and Other Operating Results (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information
Total Sales	$ 122,510	$ 203,958
Total segment contribution margin	17,744	67,651
Operating activities excluded from segment cost of goods sold	(1,985)	(2,346)
Selling, general and administrative	(15,503)	(26,961)
Depreciation, depletion and amortization	(14,556)	(13,243)
Interest expense	(6,643)	(6,836)
Other income, net, including interest income	1,790	11
Income (loss) before income taxes	(19,153)	18,276
Operating Segments [Member] \| Oil & Gas Proppants
Segment Reporting Information
Total Sales	73,865	148,753
Total segment contribution margin	851	52,195
Operating Segments [Member] \| Industrial & Specialty Products
Segment Reporting Information
Total Sales	48,645	55,205
Total segment contribution margin	$ 16,893	$ 15,456

Subsequent Events (Details) - $ / shares		3 Months Ended
Subsequent Events (Details) - $ / shares	Apr. 05, 2016	Mar. 31, 2016
Subsequent Event
Payable date		Apr. 05, 2016
Record date		Mar. 15, 2016
Dividends Payable, Date Declared		Feb. 22, 2016
Subsequent Event
Subsequent Event
Cash dividends paid (usd per share)	$ 0.0625