10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2018

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

Commission File Number: 001-38221

PQ Group Holdings Inc.

Delaware	81-3406833
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
300 Lindenwood Drive Valleybrooke Corporate Center Malvern, Pennsylvania	19355
(Address of principal executive offices)	(Zip Code)

(610) 651-4400

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ý    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer”, “smaller reporting company”, and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	¨	Accelerated filer	¨
Non-accelerated filer	ý (Do not check if a smaller reporting company)	Smaller reporting company	¨
		Emerging growth company	¨
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  ý

The number of shares of common stock outstanding as of August 6, 2018 was 135,204,637.

PQ GROUP HOLDINGS INC.

INDEX—FORM 10-Q

June 30, 2018

		Page
PART I	FINANCIAL INFORMATION
Item 1.	Financial Statements (Unaudited)
	Condensed Consolidated Statements of Operations	3
	Condensed Consolidated Statements of Comprehensive Income	4
	Condensed Consolidated Balance Sheets	5
	Condensed Consolidated Statements of Stockholders’ Equity	6
	Condensed Consolidated Statements of Cash Flows	7
	Notes to Condensed Consolidated Financial Statements	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	35
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	55
Item 4.	Controls and Procedures	55
PART II	OTHER INFORMATION
Item 1.	Legal Proceedings	56
Item 1A.	Risk Factors	56
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	56
Item 6.	Exhibits	57
	SIGNATURES	58

2

PART I—FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS (UNAUDITED).

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except share and per share amounts)

(unaudited)

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Sales	$	434,713		$	389,267		$	800,910		$	722,198
Cost of goods sold	326,309			281,853			614,385			532,072
Gross profit	108,404			107,414			186,525			190,126
Selling, general and administrative expenses	43,477			35,358			84,095			70,070
Other operating expense, net	15,873			16,976			25,187			27,324
Operating income	49,054			55,080			77,243			92,732
Equity in net (income) from affiliated companies	(13,666		)	(8,745		)	(25,518		)	(14,622		)
Interest expense, net	27,221			48,176			56,384			94,961
Debt extinguishment costs	—			—			5,879			—
Other expense, net	5,691			14,312			10,663			16,281
Income (loss) before income taxes and noncontrolling interest	29,808			1,337			29,835			(3,888		)
Provision for income taxes	13,649			3,007			13,120			97
Net income (loss)	16,159			(1,670		)	16,715			(3,985		)
Less: Net income (loss) attributable to the noncontrolling interest	377			(61		)	719			78
Net income (loss) attributable to PQ Group Holdings Inc.	$	15,782		$	(1,609	)	$	15,996		$	(4,063	)
Net income (loss) per share:
Basic income (loss) per share	$	0.12		$	(0.02	)	$	0.12		$	(0.04	)
Diluted income (loss) per share	$	0.12		$	(0.02	)	$	0.12		$	(0.04	)
Weighted average shares outstanding:
Basic	133,222,463			104,015,815			133,188,303			103,981,851
Diluted	134,209,740			104,015,815			134,047,362			103,981,851

See accompanying notes to condensed consolidated financial statements.

3

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)

(unaudited)

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Net income (loss)	$	16,159		$	(1,670	)	$	16,715		$	(3,985	)
Other comprehensive income (loss), net of tax:
Pension and postretirement benefits	1,375			(22		)	1,357			(203		)
Net gain (loss) from hedging activities	553			(1,256		)	2,736			(3,025		)
Foreign currency translation	(29,493		)	26,305			(20,822		)	41,642
Total other comprehensive income (loss)	(27,565		)	25,027			(16,729		)	38,414
Comprehensive income (loss)	(11,406		)	23,357			(14		)	34,429
Less: Comprehensive income (loss) attributable to noncontrolling interests	(1,167		)	1,024			479			579
Comprehensive income (loss) attributable to PQ Group Holdings Inc.	$	(10,239	)	$	22,333		$	(493	)	$	33,850

See accompanying notes to condensed consolidated financial statements.

4

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(in thousands, except share and per share amounts)

(unaudited)

	June 30, 2018			December 31, 2017
ASSETS
Cash and cash equivalents	$	52,553		$	66,195
Receivables, net	242,014			193,456
Inventories	268,413			262,388
Prepaid and other current assets	39,036			26,929
Total current assets	602,016			548,968
Investments in affiliated companies	477,345			469,276
Property, plant and equipment, net	1,217,002			1,230,384
Goodwill	1,260,286			1,305,956
Other intangible assets, net	759,637			786,144
Other long-term assets	98,219			74,727
Total assets	$	4,414,505		$	4,415,455
LIABILITIES
Notes payable and current maturities of long-term debt	$	54,071		$	45,166
Accounts payable	139,731			149,326
Accrued liabilities	76,356			93,917
Total current liabilities	270,158			288,409
Long-term debt, excluding current portion	2,193,769			2,185,320
Deferred income taxes	197,697			189,336
Other long-term liabilities	113,553			120,471
Total liabilities	2,775,177			2,783,536
Commitments and contingencies (Note 16)
EQUITY
Common stock ($0.01 par); authorized shares 450,000,000; issued shares 135,143,229 and 135,244,379 on June 30, 2018 and December 31, 2017, respectively; outstanding shares 135,139,716 and 135,244,379 on June 30, 2018 and December 31, 2017, respectively	1,352			1,352
Preferred stock ($0.01 par); authorized shares 50,000,000; no shares issued or outstanding on June 30, 2018 and December 31, 2017	—			—
Additional paid-in capital	1,662,748			1,655,114
Accumulated deficit	(16,781		)	(32,777		)
Treasury stock, at cost; shares 3,513 and 0 on June 30, 2018 and December 31, 2017, respectively	(58		)	—
Accumulated other comprehensive income (loss)	(12,178		)	4,311
Total PQ Group Holdings Inc. equity	1,635,083			1,628,000
Noncontrolling interest	4,245			3,919
Total equity	1,639,328			1,631,919
Total liabilities and equity	$	4,414,505		$	4,415,455

See accompanying notes to condensed consolidated financial statements.

5

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(in thousands)

(unaudited)

	Common stock		Additional paid-in capital		Accumulated deficit			Treasury stock, at cost			Accumulated other comprehensive income (loss)			Non- controlling interest			Total
Balance, December 31, 2017	$	1,352	$	1,655,114	$	(32,777	)	$	—		$	4,311		$	3,919		$	1,631,919
Net income	—		—		15,996			—			—			719			16,715
Other comprehensive loss	—		—		—			—			(16,489		)	(240		)	(16,729		)
Repurchase of common shares	—		—		—			(58		)	—			—			(58		)
Distributions to noncontrolling interests	—		—		—			—			—			(153		)	(153		)
Stock compensation expense	—		7,627		—			—			—			—			7,627
Shares issued under equity incentive plan	—		7		—			—			—			—			7
Balance, June 30, 2018	$	1,352	$	1,662,748	$	(16,781	)	$	(58	)	$	(12,178	)	$	4,245		$	1,639,328
	Common stock		Additional paid-in capital		Accumulated deficit			Treasury stock, at cost			Accumulated other comprehensive income (loss)			Non- controlling interest			Total
Balance, December 31, 2016	$	73	$	1,167,137	$	(90,380	)	$	(239	)	$	(53,711	)	$	5,064		$	1,027,944
Net income (loss)	—		—		(4,063		)	—			—			78			(3,985		)
Other comprehensive income	—		—		—			—			37,913			501			38,414
Distributions to noncontrolling interests	—		—		—			—			—			(785		)	(785		)
Stock compensation expense	—		2,828		—			—			—			—			2,828
Balance, June 30, 2017	$	73	$	1,169,965	$	(94,443	)	$	(239	)	$	(15,798	)	$	4,858		$	1,064,416

See accompanying notes to condensed consolidated financial statements.

6

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

(unaudited)

	Six months ended June 30,
	2018			2017
Cash flows from operating activities:
Net income (loss)	$	16,715		$	(3,985	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	68,865			58,030
Amortization	26,606			25,176
Acquisition accounting valuation adjustments on inventory sold	1,603			871
Amortization of deferred financing costs and original issue discount	3,079			4,348
Debt extinguishment costs	3,755			—
Foreign currency exchange loss	11,820			16,356
Pension and postretirement healthcare benefit expense	599			2,090
Pension and postretirement healthcare benefit funding	(4,040		)	(3,605		)
Deferred income tax provision (benefit)	3,128			(5,270		)
Net loss on asset disposals	5,904			2,925
Stock compensation	7,627			2,828
Equity in net (income) from affiliated companies	(25,518		)	(14,622		)
Dividends received from affiliated companies	15,890			15,071
Other, net	(3,924		)	(1,771		)
Working capital changes that provided (used) cash, excluding the effect of business combinations:
Receivables	(54,324		)	(44,046		)
Inventories	(9,853		)	2,015
Prepaids and other current assets	(3,612		)	(1,440		)
Accounts payable	960			(7,408		)
Accrued liabilities	(15,142		)	(25,812		)
Net cash provided by operating activities	50,138			21,751
Cash flows from investing activities:
Purchases of property, plant and equipment	(66,066		)	(60,613		)
Investment in affiliated companies	—			(5,000		)
Loan receivable under the New Markets Tax Credit Arrangement	—			(6,221		)
Business combinations, net of cash acquired	(1,006		)	(41,572		)
Other, net	805			491
Net cash used in investing activities	(66,267		)	(112,915		)
Cash flows from financing activities:
Draw down of revolver	123,864			250,000
Repayments of revolver	(114,813		)	(185,000		)
Issuance of long-term debt	1,267,000			8,820
Debt issuance costs	(6,395		)	—
Repayments of long-term debt	(1,264,791		)	(6,216		)
Distributions to noncontrolling interests	(153		)	(785		)
Repurchase of common shares	(58		)	—
Net cash provided by financing activities	4,654			66,819
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,883		)	(5,299		)
Net change in cash, cash equivalents and restricted cash	(13,358		)	(29,644		)
Cash, cash equivalents and restricted cash at beginning of period	67,243			85,077
Cash, cash equivalents and restricted cash at end of period	$	53,885		$	55,433

For supplemental cash flow disclosures, see Note 20.

See accompanying notes to condensed consolidated financial statements.

7

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

1. Background and Basis of Presentation:

Description of Business

PQ Group Holdings Inc. and subsidiaries (the “Company” or “PQ Group Holdings”) conducts operations through two reporting segments: (1) Environmental Catalysts & Services (“EC&S”): a leading global innovator and producer of silica catalysts used in the production of high-density polyethylene (“HDPE”), methyl methacrylate (“MMA”), specialty zeolite-based catalysts sold to the emissions control industry, the petrochemical industry and other areas of the broader chemicals industry and a merchant sulfuric acid producer operating a network of plants serving a variety of end uses, including the oil refining, nylon, mining, general industrial and chemical industries; and (2) Performance Materials & Chemicals (“PM&C”): a fully integrated, global leader in silicate technology, producing sodium silicate, specialty silicas, zeolites, spray dry silicates, magnesium silicate, and other high performance chemical products used in a variety of end uses such as adsorbents for surface coatings, clarifying agents for beverages, cleaning and personal care products and engineered glass products for use in highway safety, polymer additives, metal finishing and electronics end uses.

Seasonal changes and weather conditions typically affect the Company’s performance materials and refining services product groups. In particular, the Company’s performance materials product group generally experiences lower sales and profit in the first and fourth quarters of the year because highway striping projects typically occur during warmer weather months. Additionally, the Company’s refining services product group typically experiences similar seasonal fluctuations as a result of higher demand for gasoline products in the summer months. As a result, working capital requirements tend to be higher in the first and fourth quarters of the year, which can adversely affect the Company’s liquidity and cash flows. Because of this seasonality associated with certain of the Company’s product groups, results for any one quarter are not necessarily indicative of the results that may be achieved for any other quarter or for the full year.

Basis of Presentation

The condensed consolidated financial statements included herein are unaudited. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) have been condensed or omitted pursuant to such rules and regulations for interim reporting. In the opinion of management, all adjustments of a normal and recurring nature necessary to state fairly the financial position and results of operations have been included. The results of operations are not necessarily indicative of the results to be expected for the full year. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. Other than the update to our accounting policies described in Note 3, the Company has continued to follow the accounting policies set forth in those consolidated financial statements.

2. New Accounting Standards:

Recently Adopted Accounting Standards

In August 2017, the Financial Accounting Standards Board (“FASB”) issued amendments intended to better align hedge accounting with an entity’s risk management activities. The amendments expand hedge accounting for non-financial and financial risk components and revise the measurement methodologies to better align with an entity’s risk management activities. Separate presentation of hedge ineffectiveness is eliminated to provide greater transparency of the full impact of hedging by requiring presentation of the results of the hedged item and hedging instrument in a single financial statement line item. In addition, the amendments reduce complexity by simplifying the manner in which assessments of hedge effectiveness may be performed. The new guidance is effective for public companies for annual periods beginning after December 15, 2018, including interim periods within those years. Early adoption is permitted, and the guidance should be applied prospectively for the amended presentation and disclosure requirements, and through a cumulative-effect adjustment to beginning retained earnings for any cash flow and net investment hedges existing at the date of adoption. The Company early adopted the guidance effective January 1, 2018. The Company’s cash flow hedges in place at the date of adoption yielded an immaterial amount of ineffectiveness; therefore, the Company did not reflect an adjustment to beginning retained earnings upon adoption. The amended presentation and disclosure requirements are reflected under the new guidance in Note 13 tothese condensed consolidated financial statements.

8

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

In May 2017, the FASB issued guidance to clarify which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. Under the new guidance, an entity should account for the effects of a change in a share-based payment award using modification accounting unless the fair value, vesting conditions and classification as either a liability or equity are all the same with respect to the award immediately prior to modification and the modified award itself. The new guidance is effective for annual periods beginning after December 15, 2017, including interim periods within those years, and the new guidance should be applied prospectively to awards modified on or after the adoption date. The Company adopted the new guidance on January 1, 2018 as required, with no impact on the Company’s condensed consolidated financial statements upon adoption.

In March 2017, the FASB issued guidance to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost (collectively, “pension costs”). Under current GAAP, there are several components of pension costs which are presented net to arrive at pension costs as included in the income statement and disclosed in the notes. As part of this amendment to the existing guidance, the service cost component of pension costs will be bifurcated from the other components and included in the same line items of the income statement as compensation costs are reported. The remaining components will be reported together below operating income on the income statement, either as a separate line item or combined with another line item on the income statement and disclosed. Additionally, with respect to capitalization to inventory, fixed assets, etc., only the service cost component will be eligible for capitalization upon adoption of the guidance. The new guidance is effective for public companies for annual periods beginning after December 15, 2017, including interim periods within those years. The amendments should be applied retrospectively upon adoption with respect to the presentation of the service and other cost components of pension costs in the income statement, and prospectively for the capitalization of the service cost component in assets.

The Company adopted the new guidance on January 1, 2018 as required. Prior to the adoption of the guidance, the Company reflected its pension costs within cost of goods sold and selling, general and administrative expenses in the condensed consolidated statements of operations, depending on whether the costs were associated with employees involved in manufacturing or back office support functions. Under the new guidance, the service cost component of the Company’s pension costs remained in the same line items of the condensed consolidated statements of operations, but the remaining components are now reported as part of nonoperating income in the other (income) expense, net line item of the condensed consolidated statements of operations. Although the guidance requires retrospective application upon adoption, a practical expedient permits the Company to use the amounts disclosed in its pension and other post-retirement benefit plan note as its basis of estimation for the prior comparative periods. The Company utilized the practical expedient, and $69 and $332 of a net pension benefit for the three and six months ended June 30, 2017, respectively, was reclassified to other (income) expense, net. For the three and six months ended June 30, 2018, the amount of pension costs included in other (income) expense, net was a net benefit of $1,285 and $1,770, respectively.

In January 2017, the FASB issued guidance that clarifies the definition of a business and provides revised criteria and a framework to determine whether an integrated set of assets and activities is a business. For public companies, the new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those years. The Company adopted the new guidance on January 1, 2018 as required, with no impact on the Company’s condensed consolidated financial statements upon adoption.

In November 2016, the FASB issued guidance which clarifies the classification and presentation of changes in restricted cash on the statement of cash flows. The updates in the guidance require that the statement of cash flows explain the change during the period in the total of cash, cash equivalents and restricted cash when reconciling the beginning-of-period and end-of-period total amounts. The updates also require a reconciliation between cash, cash equivalents and restricted cash presented on the balance sheet to the total of the same amounts presented on the statement of cash flows. For public companies, the new guidance is effective for fiscal years beginning after December 15, 2017 and interim periods within those years, and the new guidance should be applied retrospectively to each period presented.

The Company adopted the new guidance on January 1, 2018 as required. As of June 30, 2018 and 2017, the Company had $1,332 and $4,976, respectively, of restricted cash included in prepaid and other current assets on its condensed consolidated balance sheets related to its New Market Tax Credit financing arrangements as well as other small restricted cash balances. Changes in the Company’s restricted cash balances prior to the adoption of the new guidance were reflected within cash flows from investing activities in the Company’s condensed consolidated statements of cash flows. The prior comparative period in the Company’s condensed consolidated statement of cash flows has been updated to conform to the new guidance. See Note 20 to these condensed consolidated financial statements for supplemental cash flow disclosures.

9

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

In August 2016, the FASB issued guidance which clarifies the classification of certain cash receipts and cash payments in the statement of cash flows, including debt prepayment or extinguishment costs and distributions from certain equity method investees. For public companies, the new guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years, and the new guidance should be applied retrospectively to each period presented. The Company adopted the new guidance on January 1, 2018 as required. There was no impact to the Company’s condensed consolidated statement of cash flows for the six months ended June 30, 2017. The Company applied the new guidance to the term loan refinancing that occurred during the six months ended June 30, 2018; see Note 12 to these condensed consolidated financial statements for further information on the debt refinancing transaction. There were no other items in the new guidance which necessitated a change in the Company’s reporting in its condensed consolidated statements of cash flows for the six months ended June 30, 2018 or 2017.

In May 2014, the FASB issued accounting guidance (with subsequent targeted amendments) to significantly enhance comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets. The core principle of the guidance is that revenue recognized from a transaction or event that arises from a contract with a customer should reflect the consideration to which an entity expects to be entitled in exchange for goods or services provided. To achieve that core principle, the new guidance sets forth a five-step revenue recognition model that will need to be applied consistently to all contracts with customers, except those that are within the scope of other topics in the Accounting Standards Codification (“ASC”). Also required are enhanced disclosures to help users of financial statements better understand the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. The enhanced disclosures include qualitative and quantitative information about contracts with customers, significant judgments made in applying the revenue guidance, and assets recognized related to the costs to obtain or fulfill a contract. For public companies, the new requirements are effective for annual reporting periods beginning after December 15, 2017, including interim periods within those years. The Company reviewed its key revenue streams and assessed the underlying customer contracts within the framework of the new guidance. The Company evaluated the key aspects of its revenue streams for impact under the new guidance and performed a detailed analysis of its customer agreements to quantify the changes under the guidance. The Company concluded that the guidance did not have a material impact on its existing revenue recognition practices upon adoption on January 1, 2018. The Company implemented the guidance under the modified retrospective transition method of adoption. Comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. The impact of adoption of the new revenue recognition guidance was immaterial for the six months ended June 30, 2018, and there was no transition adjustment required upon adoption. See Note 3 to these condensed consolidated financial statements for additional disclosures required by the new guidance.

Accounting Standards Not Yet Adopted

In June 2018, the FASB issued guidance which conforms the accounting for the issuance of all share-based payments using the same accounting model. Previously, the accounting for share-based payments to non-employees was covered under a different framework than those made to employees. Under the new guidance, awards to both employees and non-employees will essentially follow the same model, with small variations related to determining the term assumption when valuing a non-employee award as well as a different expense attribution model for non-employee awards. The new guidance is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. The Company is currently evaluating the effect that the new guidance would have on its consolidated financial statements.

In February 2018, the FASB issued guidance which will permit entities to make an election to reclassify income tax effects stranded in accumulated other comprehensive income (“AOCI”) to retained earnings as a result of tax reform legislation enacted by the U.S. government on December 22, 2017. The standard is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, with early adoption permitted in any interim period for which the financial statements have not yet been issued. Prior to the enactment of the tax reform legislation on December 22, 2017, the Company had amounts recorded in AOCI related to its domestic pension, postretirement and supplementary benefit plans and cash flow hedging relationships that were based on pre-enactment tax rates. The Company is evaluating the impact that the new guidance will have on its consolidated financial statements. If the Company makes the election to reclassify the stranded income tax effects from AOCI, it may do so using one of two transition methods: restrospectively, or at the beginning of the period of adoption.

In January 2017, the FASB issued guidance which eliminates the second step from the traditional two-step goodwill impairment test. Under current guidance, an entity performed the first step of the goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount; if an impairment loss was indicated, the entity computed the implied fair value of goodwill to determine whether an impairment loss existed, and if so, the amount to recognize. Under the new guidance, an impairment loss is recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value (the Step 1 test), with no further testing required. Any impairment loss recognized is limited to the amount of goodwill allocated to the reporting unit. The new guidance is effective for public companies that are Securities and Exchange Commission (“SEC”) registrants for fiscal years beginning after December 15, 2019, with early adoption permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The Company will apply the guidance prospectively to goodwill impairment tests subsequent to the adoption date.

10

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

In June 2016, the FASB issued guidance that affects loans, trade receivables and any other financial assets that have the contractual right to receive cash. Under the new guidance, an entity is required to recognize expected credit losses rather than incurred losses for financial assets. The new guidance is effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. The Company believes that the new guidance will not have a material impact on its consolidated financial statements.

In February 2016, the FASB issued guidance (with subsequent targeted amendments) that modifies the accounting for leases. Under the new guidance, a lessee will recognize assets and liabilities for most leases (including those classified under existing GAAP as operating leases, which based on current standards are not reflected on the balance sheet), but will recognize expenses similar to current lease accounting. For public companies, the new guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those years. Early adoption is permitted. The new guidance must be adopted using either a (1) modified retrospective transition method, in which all periods presented in the financial statements reflect the impact of the new guidance, or (2) prospective method at the date of adoption, with a cumulative-effect adjustment to the opening balance of retained earnings. The Company has operating lease agreements for which it expects to recognize right of use assets and corresponding liabilities on its balance sheet upon adoption of the new guidance. The Company has prepared a detailed plan to implement the new guidance, gathered the information related to its current lease population, and is assessing its leases in the context of the new framework. The Company is working with a vendor to implement a lease management system which will assist in delivering the required accounting changes. The Company is currently evaluating the impact that the new guidance will have on its consolidated financial statements, business processes, systems and control environment. The Company does not plan to implement the guidance prior to the required adoption date of January 1, 2019, and the Company plans to use the prospective method at the date of adoption.

3. Revenue from Contracts with Customers:

Revenue Recognition Model

In determining the appropriate amount of revenue to be recognized as the Company fulfills its obligations under its agreements, the Company performs the following steps: (i) identification of the contract with the customer; (ii) determination of whether the promised goods or services are performance obligations, including whether they are distinct in the context of the contract; (iii) measurement of the transaction price; (iv) allocation of the transaction price to the performance obligations based on estimated selling prices; and (v) recognition of revenue when (or as) the Company satisfies each performance obligation.

The Company identifies a contract when an agreement with a customer creates legally enforceable rights and obligations, which occurs when a contract has been approved by both parties, the parties are committed to perform their respective obligations, each party’s rights and payment terms are clearly identified, commercial substance exists and it is probable that the Company will collect the consideration to which it is entitled. The Company and its customers typically enter into master service agreements (“MSA”), which establish the terms, including prices, under which orders to purchase goods may be placed. In these instances, the Company’s contract with a customer is the purchase order issued under the MSA. Certain of the Company’s MSAs contain provisions regarding the purchase of a minimum quantity of goods. Under these circumstances, the Company considers the MSA to be a legally enforceable contract.

The Company identifies a performance obligation in a contract for each promised good that is separately identifiable from other promises in the contract and for which the customer can benefit from the good. The majority of the Company’s contracts have a single performance obligation, which is the promise to transfer individual goods to the customer. The Company has certain contracts that include multiple performance obligations under which the purchase price for each distinct performance obligation is defined in the contract. These distinct performance obligations may include stand-ready provisions, which are arrangements to provide a customer assurance that they will have access to output from the Company’s manufacturing facilities, or monthly reservations of capacity fees. The Company considers stand-ready provisions and reservation of capacity fees to be performance obligations satisfied over time. Revenues related to stand-ready provisions and reservation of capacity fees are recognized throughout the contract term.

As described above, the Company’s MSAs with its customers outline prices for individual products or contract provisions. MSAs in the Company’s performance chemicals and refining services product groups may contain provisions whereby raw materials costs are passed-through to the customer per the terms of their contract. The Company’s exposure to fluctuations in raw materials prices is limited, as the majority of pass-through contract provisions reset based on fluctuations in the underlying raw material price. MSAs in the Company’s refining services product group also contain take-or-pay arrangements, whereby the customer would incur a penalty in the form of a shortfall volume fee. Currently there is no history in which customers fail to meet the contractual minimum. Revenue from product sales are recorded at the net sales price, which includes estimates of variable consideration for which reserves are established and which result from discounts, returns or other allowances that are offered within contracts between the Company and its customers.

The Company recognizes revenues when performance obligations under the terms of a contract with its customer are satisfied, which generally occurs at a point in time by transferring control of a product to the customer. The Company determines the point in time when a customer obtains control of a product and the Company satisfies the performance obligation by considering factors including

11

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

when the Company has a right to payment for the product, the customer has legal title to the product, the Company has transferred possession of the product, the customer has assumed the risks and rewards of ownership of the product and the customer has accepted the product. Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring goods. The Company does not have any significant payment terms as payment is received at, or shortly after, the point of sale.

Contract Assets and Liabilities

A contract asset is a right to consideration in exchange for goods that the Company has transferred to a customer when that right is conditional on something other than the passage of time. A contract liability exists when the Company receives consideration in advance of performance obligations. Other than trade accounts receivable and customer return accruals, the Company has not recorded any additional contract assets or contract liabilities on its condensed consolidated balance sheets as of June 30, 2018.

Practical Expedients and Accounting Policy Elections

The Company has elected to use certain practical expedients and has made certain accounting policy elections as permitted under the new revenue recognition guidance. Certain of the Company’s contracts with customers are based on an individual purchase order; thus, the duration of these contracts are for one year or less. The Company has made an accounting policy election to omit certain disclosures related to remaining performance obligations for contracts which have an initial term of one year or less.

When the Company performs shipping and handling activities after the transfer of control to the customer (e.g. when control transfers prior to delivery), they are considered fulfillment activities as opposed to separate performance obligations, and the Company recognizes revenue upon the transfer of control to the customer. Accordingly, the costs associated with these shipping and handling activities are accrued when the related revenue is recognized under the Company’s policy election. The Company expenses incremental costs of obtaining a contract as incurred if the expected amortization period of the asset that the Company would have recognized is one year or less. Sales, value added and other taxes the Company collects concurrent with revenue producing activities are excluded from revenues.

Disaggregated Revenue

The Company’s primary means of disaggregating revenues is by product group, which can be found in Note 17 to these condensed consolidated financial statements.

The Company’s portfolio of products are integrated into a variety of end uses, which are described in the table below.

Key End Uses	Key Products
Industrial & process chemicals	• Silicate precursors for the tire industry
	• Glass beads, or microspheres, for metal finishing end uses
Fuels & emission control	• Refinery catalysts
	• Emission control catalysts
	• Catalyst recycling services
	• Silicate for catalyst manufacturing
Packaging & engineered plastics	• Catalysts for high-density polyethlene and chemicals syntheses
	• Antiblocks for film packaging
	• Solid and hollow microspheres for composite plastics
	• Sulfur derivatives for nylon production
Highway safety & construction	• Reflective markings for roadways and airports
	• Silica gels for surface coatings
Consumer products	• Silica gels for edible oil and beer clarification
	• Precipitated silicas, silicates and zeolites for the dentifrice and
	dishwasher and laundry detergent applications
Natural resources	• Silicates for drilling muds
	• Hollow glass beads, or microspheres, for oil well cements
	• Silicates and alum for water treatment mining
	• Bleaching aids for paper

12

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

The following tables disaggregate the Company’s sales, by segment and end use, for the three and six months months ended June 30, 2018:

	Three months ended June 30, 2018
	Environmental Catalysts & Services			Performance Materials & Chemicals		Total
Industrial & process chemicals	$	17,335		$	75,811	$	93,146
Fuels & emission control (1)	60,212			—		60,212
Packaging & engineered plastics	33,919			33,966		67,885
Highway safety & construction (1)	—			110,746		110,746
Consumer products	—			65,388		65,388
Natural resources	17,952			20,250		38,202
Total	129,418			306,161		435,579
Inter-segment sales eliminations	(866		)	—		(866		)
Total segment sales	$	128,552		$	306,161	$	434,713

	Six months ended June 30, 2018
	Environmental Catalysts & Services			Performance Materials & Chemicals		Total
Industrial & process chemicals	$	34,374		$	151,082	$	185,456
Fuels & emission control (1)	116,209			—		116,209
Packaging & engineered plastics	62,162			65,774		127,936
Highway safety & construction (1)	—			157,891		157,891
Consumer products	—			142,118		142,118
Natural resources	33,860			39,118		72,978
Total	246,605			555,983		802,588
Inter-segment sales eliminations	(1,678		)	—		(1,678		)
Total segment sales	$	244,927		$	555,983	$	800,910

⁽¹⁾ As described in Note 1, the Company experiences seasonal sales fluctuations to customers in the fuels & emission control and highway safety & construction end uses.

4. Fair Value Measurements:

Fair values are based on quoted market prices when available. When market prices are not available, fair values are generally estimated using discounted cash flow analyses, incorporating current market inputs for similar financial instruments with comparable terms and credit quality. In instances where there is little or no market activity for the same or similar instruments, the Company estimates fair values using methods, models and assumptions that management believes a hypothetical market participant would use to determine a current transaction price. These valuation techniques involve some level of management estimation and judgment that becomes significant with increasingly complex instruments or pricing models. Where appropriate, adjustments are included to reflect the risk inherent in a particular methodology, model or input used.

13

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

The Company’s financial assets and liabilities carried at fair value have been classified based upon a fair value hierarchy. The hierarchy gives the highest ranking to fair values determined using unadjusted quoted prices in active markets for identical assets and liabilities (Level 1) and the lowest ranking to fair values determined using methodologies and models with unobservable inputs (Level 3). The classification of an asset or a liability is based on the lowest level input that is significant to its measurement. For example, a Level 3 fair value measurement may include inputs that are both observable (Levels 1 and 2) and unobservable (Level 3). The levels of the fair value hierarchy are as follows:

• Level 1—Values are unadjusted quoted prices for identical assets and liabilities in active markets accessible at the measurement date. Active markets provide pricing data for trades occurring at least weekly and include exchanges and dealer markets.

• Level 2—Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices from those willing to trade in markets that are not active, or other inputs that are observable or can be corroborated by market data for the term of the instrument. Such inputs include market interest rates and volatilities, spreads and yield curves.

• Level 3—Certain inputs are unobservable (supported by little or no market activity) and significant to the fair value measurement. Unobservable inputs reflect the Company’s best estimate of what hypothetical market participants would use to determine a transaction price for the asset or liability at the reporting date.

The following table presents information about the Company’s assets and liabilities that were measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017, and indicates the fair value hierarchy of the valuation techniques the Company utilized to determine such fair value.

	June 30, 2018		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Derivative contracts	$	12,010	$	—	$	12,010	$	—
Restoration plan assets	4,962		4,962		—		—
Total	$	16,972	$	4,962	$	12,010	$	—
Liabilities:
Derivative contracts	$	196	$	—	$	196	$	—
Total	$	196	$	—	$	196	$	—

	December 31, 2017		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Derivative contracts	$	1,043	$	—	$	1,043	$	—
Restoration plan assets	5,576		5,576		—		—
Total	$	6,619	$	5,576	$	1,043	$	—
Liabilities:
Derivative contracts	$	448	$	—	$	448	$	—
Total	$	448	$	—	$	448	$	—

Restoration plan assets

The fair values of the Company’s restoration plan assets are determined through quoted prices in active markets. Restoration plan assets are assets held in a Rabbi trust to fund the obligations of the Company’s defined benefit supplementary retirement plans and include various stock and fixed income mutual funds. See Note 15 to these condensed consolidated financial statements regarding defined supplementary retirement plans. Unrealized gains and losses associated with the underlying stock and fixed income mutual funds were immaterial as of June 30, 2018 and December 31, 2017, respectively.

14

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

Derivative contracts

Derivative assets and liabilities can be exchange-traded or traded over-the-counter (“OTC”). The Company generally values exchange-traded derivatives using models that calibrate to market transactions and eliminate timing differences between the closing price of the exchange-traded derivatives and their underlying instruments. OTC derivatives are valued using market transactions and other market evidence whenever possible, including market-based inputs to models, model calibration to market transactions, broker or dealer quotations or alternative pricing sources with reasonable levels of price transparency. When models are used, the selection of a particular model to value an OTC derivative depends on the contractual terms of, and specific risks inherent in, the instrument as well as the availability of pricing information in the market. The Company generally uses similar models to value similar instruments. Valuation models require a variety of inputs, including contractual terms, market prices and rates, forward curves, measures of volatility, and correlations of such inputs. For OTC derivatives that trade in liquid markets, such as forward contracts, swaps and options, model inputs can generally be corroborated by observable market data by correlation or other means, and model selection does not involve significant management judgment.

The Company has interest rate caps, natural gas swaps and cross currency swaps that are fair valued using Level 2 inputs. In addition, the Company applies a credit valuation adjustment to reflect credit risk which is calculated based on credit default swaps. To the extent that the Company’s net exposure under a specific master agreement is an asset, the Company utilizes the counterparty’s default swap rate. If the net exposure under a specific master agreement is a liability, the Company utilizes a default swap rate comparable to PQ Group Holdings. The credit valuation adjustment is added to the discounted fair value to reflect the exit price that a market participant would be willing to receive to assume the Company’s liabilities or that a market participant would be willing to pay for the Company’s assets. As of June 30, 2018 and December 31, 2017, the credit valuation adjustment resulted in a minimal change in the fair value of the derivatives.

5. Accumulated Other Comprehensive Income:

The following tables present the tax effects of each component of other comprehensive income (loss) for the three and six months ended June 30, 2018 and 2017:

	Three months ended June 30,
	2018									2017
	Pre-tax amount			Tax benefit/(expense)			After-tax amount			Pre-tax amount			Tax benefit/(expense)			After-tax amount
Defined benefit and other postretirement plans:
Amortization and unrealized losses	$	1,833		$	(458	)	$	1,375		$	(34	)	$	12		$	(22	)
Benefit plans, net	1,833			(458		)	1,375			(34		)	12			(22		)
Net gain (loss) from hedging activities	737			(184		)	553			(2,025		)	769			(1,256		)
Foreign currency translation	(29,947		)	454			(29,493		)	30,612			(4,307		)	26,305
Other comprehensive income (loss)	$	(27,377	)	$	(188	)	$	(27,565	)	$	28,553		$	(3,526	)	$	25,027
	Six months ended June 30,
	2018									2017
	Pre-tax amount			Tax benefit/(expense)			After-tax amount			Pre-tax amount			Tax benefit/(expense)			After-tax amount
Defined benefit and other postretirement plans:
Amortization and unrealized losses	$	1,809		$	(452	)	$	1,357		$	(228	)	$	25		$	(203	)
Benefit plans, net	1,809			(452		)	1,357			(228		)	25			(203		)
Net gain (loss) from hedging activities	3,649			(913		)	2,736			(4,887		)	1,862			(3,025		)
Foreign currency translation	(19,833		)	(989		)	(20,822		)	47,859			(6,217		)	41,642
Other comprehensive income (loss)	$	(14,375	)	$	(2,354	)	$	(16,729	)	$	42,744		$	(4,330	)	$	38,414

15

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

The following table presents the change in accumulated other comprehensive income, net of tax, by component for the six months ended June 30, 2018 and 2017:

	Defined benefit and other postretirement plans			Net gain (loss) from hedging activities			Foreign currency translation			Total
December 31, 2017	$	7,412		$	967		$	(4,068	)	$	4,311
Other comprehensive income (loss) before reclassifications	1,387			2,613			(20,582		)	(16,582		)
Amounts reclassified from accumulated other comprehensive income(1)	(30		)	123			—			93
Net current period other comprehensive income (loss)	1,357			2,736			(20,582		)	(16,489		)
June 30, 2018	$	8,769		$	3,703		$	(24,650	)	$	(12,178	)
December 31, 2016	$	7,513		$	4,557		$	(65,781	)	$	(53,711	)
Other comprehensive income (loss) before reclassifications	(137		)	(3,038		)	41,141			37,966
Amounts reclassified from accumulated other comprehensive income(1)	(66		)	13			—			(53		)
Net current period other comprehensive income (loss)	(203		)	(3,025		)	41,141			37,913
June 30, 2017	$	7,310		$	1,532		$	(24,640	)	$	(15,798	)

⁽¹⁾  See the following table for details about these reclassifications. Amounts in parentheses indicate debits.

16

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

The following table presents the reclassifications out of accumulated other comprehensive income for the three and six months ended June 30, 2018 and 2017.

Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income(a)												Affected Line Item in the Statements of Operations
	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Defined benefit and other postretirement plans
Amortization of prior service credit	$	(20	)	$	(20	)	$	(39	)	$	(39	)	(b)
Amortization of net (gain) loss	1			(19		)	3			(38		)	(b)
	(19		)	(39		)	(36		)	(77		)	Total before tax
	3			6			6			11			Tax expense (benefit)
	$	(16	)	$	(33	)	$	(30	)	$	(66	)	Net of tax
Net (gain) loss from hedging activities
Interest rate caps	$	58		$	9		$	93		$	11		Interest expense
Natural gas swaps	99			28			71			10			Cost of goods sold
	157			37			164			21			Total before tax
	(39		)	(8		)	(41		)	(8		)	Tax expense (benefit)
	$	118		$	29		$	123		$	13		Net of tax
Total reclassifications for the period	$	102		$	(4	)	$	93		$	(53	)	Net of tax

^(a)  Amounts in parentheses indicate credits to profit/loss.

^(b)  These accumulated other comprehensive income (loss) components are included in the computation of net periodic pension and other postretirement cost (see Note 15 to these condensed consolidated financial statements for additional details).

6. Acquisition:

Acquisitions are accounted for using the acquisition method of accounting. Under the acquisition method, the purchase price is allocated to the identifiable net assets acquired based on the fair values of the identifiable assets acquired and liabilities assumed as of the acquisition date. The excess of the purchase price over the fair values of the identifiable net assets acquired is recorded as goodwill.

On June 12, 2017 (the “Acquisition Date”), the Company acquired the facilities of Sovitec Mondial S.A. (“Sovitec”) located in Belgium, Spain, Argentina and France as part of a stock transaction (the “Acquisition”) for $41,572 in cash, excluding assumed debt. Based in Fleurus, Belgium, Sovitec is a high quality producer of engineered glass products used in transportation safety, metal finishing and polymer additives. The results of operations of Sovitec have been included in the Company’s consolidated financial statements since the Acquisition Date.

17

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

The following table sets forth the calculation and allocation of the purchase price to the identifiable net assets acquired with respect to the Acquisition, which was complete as of March 31, 2018.

	Provisional Purchase Price Allocation			Adjustments			Purchase Price Allocation
Total consideration, net of cash acquired	$	41,572		$	—		$	41,572
Recognized amounts of identifiable assets acquired and liabilities assumed:
Receivables	$	14,305		$	—		$	14,305
Inventories	7,645			1,603			9,248
Prepaid and other current assets	400			—			400
Property, plant and equipment	9,020			15,960			24,980
Other intangible assets	—			5,753			5,753
Other long-term assets	129			15,921			16,050
Fair value of assets acquired	31,499			39,237			70,736
Current debt	(6,420		)	—			(6,420		)
Accounts payable	(10,748		)	—			(10,748		)
Long-term debt	(10,189		)	—			(10,189		)
Deferred income taxes	—			(4,426		)	(4,426		)
Other long-term liabilities	(154		)	—			(154		)
Fair value of net assets acquired	3,988			34,811			38,799
Goodwill	37,584			(34,811		)	2,773
	$	41,572		$	—		$	41,572

As of the Acquisition Date, the fair value of accounts receivable approximated historical cost. The gross contractual amount of accounts receivable at the Acquisition Date was $14,607, of which $302 was deemed uncollectible. The fair value of inventory is defined as estimated selling prices less the sum of (a) costs of disposal and (b) a reasonable profit allowance for the selling effort of the acquiring entity, which was $1,603 higher than the historical cost.

The Company’s cost of goods sold for the six months ended June 30, 2018 includes a pre-tax charge of $1,603 relating to the step-up on inventory, $108 of additional amortization expense related to identified intangible assets and $421 of additional depreciation expense, which would have been recorded during the year ended December 31, 2017 if the adjustments to the provisional amounts had been recognized as of the Acquisition Date. The Company’s other expense, net for the six months ended June 30, 2018 includes additional amortization expense related to identified intangible assets of $101 which would have been recorded during the year ended December 31, 2017 if the adjustments to the provisional amounts had been recognized as of the Acquisition Date. The Company’s provision for income taxes for the six months ended June 30, 2018 includes an additional $990 tax benefit associated with the year ended December 31, 2017, to reflect impacts as if the adjustments to the provisional amounts had been recognized as of the Acquisition Date. This amount is primarily a result of opening balance sheet adjustments recorded during the six months ended June 30, 2018, which needed to be re-measured through the income statement because of income tax rate changes that occurred subsequent to the Acquisition Date.

The Company believes that the Acquisition will enable it to offer a more comprehensive, cost-effective and high-quality portfolio of products and services to its customers worldwide when, combined with anticipated synergies within its existing business, contributed to a total purchase price that resulted in the recognition of goodwill. All of the goodwill was assigned to the Company’s PM&C reporting segment. The goodwill associated with the Acquisition is not deductible for tax purposes.

18

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

The valuation of the intangible assets acquired and the related weighted-average amortization periods are as follows:

	Amount		Weighted-Average Expected Useful Life (in years)
Intangible assets subject to amortization:
Trademarks	$	1,767	11
Technical know-how	1,892		11
Total intangible assets subject to amortization	3,659
Trade names, not subject to amortization	2,094		Indefinite
Total	$	5,753

Net sales and net income generated by the Sovitec legal entities included in the Company’s condensed consolidated statements of operations are as follows:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Net sales	$	19,326	$	3,704	$	30,247	$	3,704
Net income	2,585		503		814		503

Acquisition costs were immaterial for the three and six months ended June 30, 2018 and were $454 and $1,328 for the three and six months ended June 30, 2017, respectively. Acquisition costs are included in other operating expense, net in the Company’s condensed consolidated statements of operations.

Pro Forma Financial Information

The unaudited pro forma financial information for the three and six months ended June 30, 2017 has been derived from the Company’s historical consolidated financial statements and prepared to give effect to the Acquisition, assuming that the Acquisition occurred on January 1, 2016. The unaudited pro forma consolidated results of operations are provided for illustrative purposes only and are not indicative of the Company’s actual consolidated results of operations had the Acquisition been made as of January 1, 2016. The unaudited pro forma results of operations do not reflect any operating efficiencies or potential cost savings which may result from the Acquisition.

	Unaudited
	Three months ended June 30, 2017			Six months ended June 30, 2017
Pro forma sales	$	397,251		$	738,625
Pro forma net loss	(2,629		)	(4,162		)
Pro forma net loss attributable to PQ Group Holdings Inc.	(2,568		)	(4,240		)
Pro forma basic and diluted net loss per share	$	(0.02	)	$	(0.04	)

The results of operations for the three and six months ended June 30, 2018 include the operating results of the combined company for the full period and therefore, there is no pro forma presentation included in the table above.

Certain non-recurring charges included in the Company’s results of operations for the three and six months ended June 30, 2017 were allocated to the respective prior year periods for pro forma purposes. For the three months ended June 30, 2017, non-recurring charges allocated to the prior year period include transaction fee charges of $454 which were excluded from pro forma net loss. Also included in pro forma net loss for the three months ended June 30, 2017 is amortization expense of $90 and depreciation expense of $149 associated with the fair value step-up of identifiable intangible assets and property, plant and equipment, respectively. For the six months ended June 30, 2017, non-recurring charges allocated to the prior year period include transaction fee charges of $1,328 which were excluded from pro forma net loss. Also included in pro forma net loss for the six months ended June 30, 2017 is amortization expense of $176 and depreciation expense of $353 associated with the fair value step-up of identifiable intangible assets and property, plant and equipment, respectively.

19

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

7. Goodwill:

The changes in the carrying amount of goodwill for the six months ended June 30, 2018 is summarized as follows:

	Performance Materials & Chemicals			Environmental Catalysts & Services			Total
Balance as of December 31, 2017	$	914,623		$	391,333		$	1,305,956
Goodwill recognized	629			—			629
Goodwill adjustments(1)	(34,811		)	—			(34,811		)
Foreign exchange impact	(10,851		)	(637		)	(11,488		)
Balance as of June 30, 2018	$	869,590		$	390,696		$	1,260,286

⁽¹⁾  Represents the measurement period adjustments on the net assets acquired as part of the Acquisition (see Note 6 to these condensed consolidated financial statements for further information regarding the Acquisition).

8. Other Operating Expense, Net:

A summary of other operating expense, net is as follows:

	Three months ended June 30,					Six months ended June 30,
	2018			2017		2018			2017
Amortization expense	$	8,744		$	8,290	$	17,693		$	14,124
Transaction and other related costs(1)	190			2,954		612			4,329
Restructuring and other related costs (Note 18)	10			276		130			1,472
Net loss on asset disposals(2)	4,752			2,577		5,904			2,925
Management advisory fees	—			1,250		—			2,500
Insurance proceeds(2)	(313		)	—		(1,557		)	—
Other, net	2,490			1,629		2,405			1,974
	$	15,873		$	16,976	$	25,187		$	27,324

⁽¹⁾  Transaction and other related costs for the three and six months ended June 30, 2018 and 2017 primarily include transaction costs associated with the Company’s initial public offering (exclusive of the direct costs recorded in stockholders’ equity net of the proceeds from the offering) and the Acquisition (see Note 6 to these condensed consolidated financial statements for further information).

⁽²⁾  During the three and six months ended June 30, 2018, the Company recognized $1,000 and $2,500, respectively, of insurance proceeds in its condensed consolidated statement of operations related to the Company’s claim for losses sustained during Hurricane Harvey in August 2017. For the three months ended June 30, 2018, $264 was recorded as a gain in other operating expense, net, as reimbursement of expenses, while the remaining $736 represented proceeds in excess of the Company’s property losses which was recorded as a non-operating gain in other expense, net, in the Company’s consolidated statement of operations. For the six months endedJune 30, 2018, $1,557 was recorded as a gain in other operating expense, net, as reimbursement of expenses, $207 was recorded as a gain in net loss on asset disposals within other operating expense, net, for the Company’s previously recognized property losses, and $736 represented proceeds in excess of the Company’s property losses which was recorded as a non-operating gain in other expense, net, in the Company’s consolidated statement of operations.

20

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

9. Inventories:

Inventories are classified and valued as follows:

	June 30, 2018		December 31, 2017
Finished products and work in process	$	203,701	$	199,919
Raw materials	64,712		62,469
	$	268,413	$	262,388
Valued at lower of cost or market:
LIFO basis	$	168,256	$	162,315
Valued at lower of cost and net realizable value:
FIFO or average cost basis	100,157		100,073
	$	268,413	$	262,388

10. Investments in Affiliated Companies:

The Company accounts for investments in affiliated companies under the equity method. Affiliated companies accounted for on the equity basis as of June 30, 2018 are as follows:

Company	Country	Percent Ownership
PQ Silicates Ltd.	Taiwan	50%
Zeolyst International	USA	50%
Zeolyst C.V.	Netherlands	50%
Quaker Holdings	South Africa	49%

Following is summarized information of the combined investments⁽¹⁾:    

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Net sales	$	108,898	$	68,732	$	197,474	$	141,787
Gross profit	40,669		29,661		76,191		58,586
Operating income	31,622		19,112		57,663		37,695
Net income	30,638		20,809		57,660		39,844

⁽¹⁾  Summarized information of the combined investments is presented at 100%; the Company’s share of the net assets and net income of affiliates is calculated based on the percent ownership specified in the table above.

The Company’s investments in affiliated companies balance as of June 30, 2018 and December 31, 2017 includes net purchase accounting fair value adjustments of $261,384 and $264,700, respectively, related to the combination of the businesses of PQ Holdings Inc. and Eco Services Operations LLC in May 2016, consisting primarily of goodwill and intangible assets such as customer relationships, technical know-how and trade names. Consolidated equity in net income from affiliates is net of $1,658 and $3,316 of amortization expense related to purchase accounting fair value adjustments for the three and six months ended June 30, 2018, respectively. Consolidated equity in net income from affiliates is net of $1,658 and $5,282 of amortization expense related to purchase accounting fair value adjustments for the three and six months ended June 30, 2017.

21

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

11. Property, Plant and Equipment:

A summary of property, plant and equipment, at cost, and related accumulated depreciation is as follows:

	June 30, 2018			December 31, 2017
Land	$	192,017		$	191,006
Buildings	209,672			200,054
Machinery and equipment	1,063,438			1,005,025
Construction in progress	121,157			145,414
	1,586,284			1,541,499
Less: accumulated depreciation	(369,282		)	(311,115		)
	$	1,217,002		$	1,230,384

Depreciation expense was $33,962 and $29,841 for the three months ended June 30, 2018 and 2017, respectively. Depreciation expense was $68,865 and $58,030 for the six months ended June 30, 2018 and 2017, respectively.

12. Long-term Debt:

The summary of long-term debt is as follows:

	June 30, 2018			December 31, 2017
Term Loan Facility (U.S. dollar denominated)	$	—		$	916,153
Term Loan Facility (Euro denominated)	—			335,808
New Term Loan Facility	1,260,665			—
6.75% Senior Secured Notes due 2022	625,000			625,000
5.75% Senior Unsecured Notes due 2025	300,000			300,000
ABL Facility	32,000			25,000
Other	69,990			68,318
Total debt	2,287,655			2,270,279
Original issue discount	(21,409		)	(18,390		)
Deferred financing costs	(18,406		)	(21,403		)
Total debt, net of original issue discount and deferred financing costs	2,247,840			2,230,486
Less: current portion	(54,071		)	(45,166		)
Total long-term debt, excluding current portion	$	2,193,769		$	2,185,320

The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction. As of June 30, 2018 and December 31, 2017, the fair value of the senior secured term loans and senior secured and unsecured notes was higher than book value by $16,496 and $59,319, respectively. The fair value of the senior secured term loans and senior secured and unsecured notes was derived from published loan prices as of June 30, 2018 and December 31, 2017, as applicable. The fair value is classified as Level 2 based upon the fair value hierarchy (see Note 4 to these condensed consolidated financial statements for further information on fair value measurements).

New Term Loan Facility

On February 8, 2018 (the “Closing Date”), PQ Corporation (the “Borrower”), an indirect, wholly owned subsidiary of the Company, refinanced its existing senior secured term loan facility with a new $1,267,000 senior secured term loan facility (the “New Term Loan Facility”) by entering into a third amendment agreement (the “Amendment”), which amended and restated the Term Loan Credit Agreement dated as of May 4, 2016, among the Borrower, CPQ Midco I Corporation, Credit Suisse AG, Cayman Island Branch, as administrative agent and collateral agent, and the lenders and the other parties party thereto from time to time (as amended prior to the Amendment, the “Existing Credit Agreement” and as amended and restated by the Amendment, the “New Credit Agreement”).

22

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

The New Term Loan Facility bears interest at a floating rate of LIBOR plus 2.50% per annum and matures in February 2025, effectively lowering the interest rate margin, eliminating the interest rate floor that existed on the Euro-denominated tranche prior to refinancing, and extending the maturity of its senior secured term loan facility. The New Term Loan Facility requires scheduled quarterly amortization payments, each equal to 0.25% of the original principal amount of the loans under the New Term Loan Facility. Voluntary prepayments of the New Term Loan Facility in connection with a Repricing Transaction, as defined in the New Credit Agreement, on or prior to six months after the Closing Date will be subject to a call premium of 1.00%. Otherwise, outstanding loans under the New Term Loan Facility may be voluntarily prepaid at any time without premium or penalty. In addition, the New Credit Agreement contains customary mandatory prepayments, affirmative and negative covenants and events of default, all of which are substantially the same as under the Existing Credit Agreement.

The Company recorded $2,124 of new creditor and third-party financing costs as debt extinguishment costs. In addition, previous unamortized deferred financing costs of $1,403 and original issue discount of $2,352 associated with the previously outstanding debt were written off as debt extinguishment costs.

On the Closing Date, the Company also entered into multiple cross currency swap arrangements to hedge foreign currency risk. The swaps are designed to enable the Company to effectively convert a portion of its fixed-rate U.S. dollar denominated debt obligations into approximately €280,000 equivalent ($327,102 as of June 30, 2018). The swaps are expected to mature in February 2023.

13. Financial Instruments:

The Company uses (1) interest rate related derivative instruments to manage its exposure to changes in interest rates on its variable-rate debt instruments, (2) commodity derivatives to manage its exposure to commodity price fluctuations, and (3) foreign currency related derivative instruments to manage its foreign currency exposure to its net investments in certain foreign operations. The Company does not speculate using derivative instruments.

By using derivative financial instruments to hedge exposures to changes in interest rates, commodity prices and foreign currency, the Company exposes itself to credit risk and market risk. Credit risk is the failure of the counterparty to perform under the terms of the derivative contract. When the fair value of a derivative contract is an asset, the counterparty owes the Company, which creates credit risk for the Company. When the fair value of a derivative contract is a liability, the Company owes the counterparty and therefore, the Company is not exposed to the counterparty’s credit risk in those circumstances. The Company minimizes counterparty credit risk in derivative instruments by entering into transactions with high quality counterparties. The derivative instruments entered into by the Company do not contain credit-risk-related contingent features.

Market risk is the adverse effect on the value of a derivative instrument that results from a change in interest rates, currency exchange rates or commodity prices. The market risk associated with the Company’s derivative instruments is managed by establishing and monitoring parameters that limit the types and degree of market risk that may be undertaken.

Use of Derivative Financial Instruments to Manage Commodity Price Risk. The Company is exposed to risks in energy costs due to fluctuations in energy prices, particularly natural gas. The Company has a hedging program in the United States which allows the Company to mitigate exposure to natural gas volatility with natural gas swap agreements. Fair value is determined based on estimated amounts that would be received or paid to terminate the contracts at the reporting date based on quoted market prices of comparable contracts. The respective current and non-current liabilities are recorded in accrued liabilities and other long-term liabilities and the respective current and non-current assets are recorded in prepaid and other current assets and other long-term assets, as applicable, in the Company’s consolidated balance sheet. As the derivatives are designated and qualify as cash flow hedges, the gains or losses on the natural gas swaps are recorded in stockholders’ equity as a component of other comprehensive income (loss) (“OCI”), net of tax. Reclassifications of the gains and losses on natural gas hedges into earnings are recorded in production costs and subsequently charged to cost of goods sold in the consolidated statements of operations in the period in which the associated inventory is sold. As of June 30, 2018, the Company’s natural gas swaps had a remaining notional quantity of 2.7 million MMBTU to mitigate commodity price volatility through December 2020.

23

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

Use of Derivative Financial Instruments to Manage Interest Rate Risk. The Company is exposed to fluctuations in interest rates on its senior secured credit facilities. Changes in interest rates will not affect the market value of such debt but will affect the Company’s interest payments over the term of the loans. Likewise, an increase in interest rates could have a material impact on the Company’s cash flow. The Company hedges the interest rate fluctuations on debt obligations through interest rate cap agreements. The Company records these agreements at fair value as assets or liabilities in its consolidated balance sheet. As the derivatives are designated and qualify as cash flow hedges, the gains or losses on the interest rate cap agreements are recorded in stockholders’ equity as a component of OCI, net of tax. Reclassifications of the gains and losses on the interest rate cap agreements into earnings are recorded as part of interest expense in the consolidated statements of operations as the Company makes its interest payments on the hedged portion of its senior secured credit facilities. Fair value is determined based on estimated amounts that would be received or paid to terminate the contracts at the reporting date based on quoted market prices.

In July 2016, the Company entered into interest rate cap agreements, paying a premium of $1,551 to mitigate interest rate volatility from July 2016 through July 2020 by employing varying cap rates, ranging from 1.50% to 3.00%, on $1,000,000 of notional variable-rate debt. The cap rate currently in effect at June 30, 2018 is 2.00%.

Use of Derivative Financial Instruments to Manage Foreign Currency Risk. The Company is exposed to risks related to its net investments in foreign operations due to fluctuations in foreign currency exchange rates, particularly between the United States dollar and the Euro. In connection with the February 2018 term loan refinancing (see Note 12 to these condensed consolidated financial statements), the Company entered into multiple cross currency interest rate swap arrangements with an aggregate notional amount of €280,000 ($327,102 as of June 30, 2018) to hedge this exposure on the net investments of certain of its Euro-denominated subsidiaries. The Company records these swap agreements at fair value as assets or liabilities in its consolidated balance sheet. As the derivatives are designated and qualify as net investment hedges, changes in the fair value of the swaps attributable to changes in the spot exchange rates are recognized in cumulative translation adjustment (“CTA”) within OCI and are held there until the hedged net investments are sold or substantially liquidated. Changes in the fair value of the swaps attributable to the cross currency basis spread are excluded from the assessment of hedge effectiveness and are recorded in current period earnings. Upon such sale or liquidation, the amount recognized in CTA is reclassified to earnings and reported in the same line item as the gain or loss on the liquidation of the net investments.

The fair values of derivative instruments held as of June 30, 2018 and December 31, 2017 are shown below:

	Balance sheet location	June 30, 2018		December 31, 2017
Derivative assets:
Derivatives designated as cash flow hedges:
Natural gas swaps	Prepaid and other current assets	$	2	$	—
Interest rate caps	Prepaid and other current assets	1,208		$	44
Interest rate caps	Other long-term assets	3,139		999
		4,349		1,043
Derivatives designed as net investment hedges:
Cross currency swaps	Prepaid and other current assets	5,367		—
Cross currency swaps	Other long-term assets	2,294		—
		7,661		—
Total derivative assets		$	12,010	$	1,043
Derivative liabilities:
Derivatives designated as cash flow hedges:
Natural gas swaps	Accrued liabilities	$	25	$	318
Natural gas swaps	Other long-term liabilities	171		130
Total derivative liabilities		$	196	$	448

24

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

The following tables show the effect of the Company’s derivative instruments designated as cash flow hedges on accumulated other comprehensive income (“AOCI”) for the three and six months ended June 30, 2018 and 2017:

		Three months ended June 30,
		2018					2017
	Location of gain (loss) reclassified from AOCI into income	Amount of gain (loss) recognized in OCI on derivatives		Amount of gain (loss) reclassified from AOCI into income			Amount of gain (loss) recognized in OCI on derivatives			Amount of gain (loss) reclassified from AOCI into income
Interest rate caps	Interest (expense) income	$	451	$	(58	)	$	(1,839	)	$	(9	)
Natural gas swaps	Cost of goods sold	129		(99		)	(224		)	(28		)
		$	580	$	(157	)	$	(2,063	)	$	(37	)
		Six months ended June 30,
		2018					2017
	Location of gain (loss) reclassified from AOCI into income	Amount of gain (loss) recognized in OCI on derivatives		Amount of gain (loss) reclassified from accumulated OCI into income			Amount of gain (loss) recognized in OCI on derivatives			Amount of gain (loss) reclassified from AOCI into income
Interest rate caps	Interest (expense) income	$	3,303	$	(93	)	$	(4,150	)	$	(11	)
Natural gas swaps	Cost of goods sold	182		(71		)	(759		)	(10		)
		$	3,485	$	(164	)	$	(4,909	)	$	(21	)

The following tables show the effect of the Company’s cash flow hedge accounting on the condensed consolidated statements of operations for the three and six months ended June 30, 2018 and 2017:

	Location and amount of gain (loss) recognized in income on cash flow hedging relationships
	Three months ended June 30,
	2018						2017
	Cost of goods sold			Interest (expense) income			Cost of goods sold			Interest (expense) income
Total amounts of income and expense line items presented in the statement of operations in which the effects of cash flow hedges are recorded	$	(326,309	)	$	(27,221	)	$	(281,853	)	$	(48,176	)
The effects of cash flow hedging:
Gain (loss) on cash flow hedging relationships:
Interest contracts:
Amount of gain (loss) reclassified from AOCI into income	—			(58		)	—			(9		)
Commodity contracts:
Amount of gain (loss) reclassified from AOCI into income	(99		)	—			(28		)	—

25

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

	Location and amount of gain (loss) recognized in income on cash flow hedging relationships
	Six months ended June 30,
	2018				2017
	Cost of goods sold		Interest (expense) income		Cost of goods sold		Interest (expense) income
Total amounts of income and expense line items presented in the statement of operations in which the effects of cash flow hedges are recorded	(614,385	)	(56,384	)	(532,072	)	(94,961	)
The effects of cash flow hedging:
Gain (loss) on cash flow hedging relationships:
Interest contracts:
Amount of gain (loss) reclassified from AOCI into income	—		(93	)	—		(11	)
Commodity contracts:
Amount of gain (loss) reclassified from AOCI into income	(71	)	—		(10	)	—

The following tables show the effect of the Company’s net investment hedges on AOCI and the condensed consolidated statements of operations for the three and six months ended June 30, 2018 and 2017:

	Amount of gain (loss) recognized in OCI on derivative				Location of gain (loss) reclassified from AOCI into income	Amount of gain (loss) reclassified from AOCI into income				Location of gain (loss) recognized in income on derivative (amount excluded from effectiveness testing)	Amount of gain (loss) recognized in income on derivative (amount excluded from effectiveness testing)
	Three months ended June 30,					Three months ended June 30,					Three months ended June 30,
	2018		2017			2018		2017			2018		2017
Cross currency swaps	$	16,937	$	—	Gain (loss) on sale of subsidiary	$	—	$	—	Interest (expense) income	$	2,224	$	—

	Amount of gain (loss) recognized in OCI on derivative				Location of gain (loss) reclassified from AOCI into income	Amount of gain (loss) reclassified from AOCI into income				Location of gain (loss) recognized in income on derivative (amount excluded from effectiveness testing)	Amount of gain (loss) recognized in income on derivative (amount excluded from effectiveness testing)
	Six months ended June 30,					Six months ended June 30,					Six months ended June 30,
	2018		2017			2018		2017			2018		2017
Cross currency swaps	$	7,661	$	—	Gain (loss) on sale of subsidiary	$	—	$	—	Interest (expense) income	$	3,391	$	—

The amount of unrealized losses in AOCI that are expected to be reclassified to the consolidated statement of operations over the next twelve months is $479 as of June 30, 2018.

26

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

14. Income Taxes:

The effective income tax rate for the three months ended June 30, 2018 was 45.8% compared to 224.9% for the three months ended June 30, 2017. The effective income tax rate for the six months ended June 30, 2018 was 44.0% compared to (2.5)% for the six months ended June 30, 2017. The Company’s effective income tax rate fluctuates based primarily on changes in income mix (including the effect of loss companies), the impacts of recently enacted U.S. tax law and changes in foreign exchange gains and losses, which create permanent differences in certain jurisdictions.

The difference between the U.S. federal statutory income tax rate and the Company’s effective income tax rate for the six months ended June 30, 2018 was mainly due to the tax effect of permanent differences related to foreign currency exchange gain or loss, inclusion of foreign earnings in the U.S. as a result of recently enacted tax law, pre-tax losses with no associated tax benefit, discrete impacts of opening balance sheet adjustments related to the Sovitec acquisition and state taxes.

The difference between the U.S. federal statutory income tax rate and the Company’s effective income tax rate for six months ended June 30, 2017 was mainly due to the tax effect of repatriating foreign earnings back to the United States as dividends offset by lower tax rates in foreign jurisdictions as compared to the U.S. tax rate, foreign withholdings taxes, state taxes and non-deductible transaction costs.

On December 22, 2017, the U.S. government enacted tax reform legislation (the Tax Cuts and Jobs Act of 2017, or “TCJA”) that introduced significant changes to the taxation of multination corporations. As a result of the TCJA, at December 31, 2017 the Company recorded a provisional tax benefit of $64,343 related to the corporate rate reduction from 35% to 21%, a provisional tax expense of $43,000 related to the one-time mandatory transition tax and a provisional tax benefit of $25,196 related to undistributed foreign earnings that are no longer intended to be permanently reinvested.

Due to the complexities involved in accounting for the enactment of the TCJA, the SEC staff issued Staff Accounting Bulletin (“SAB”) No. 118, which allowed the Company to record provisional amounts in earnings for the year ended December 31, 2017. SAB No. 118 provides that where reasonable estimates can be made, provisional accounting should be employed with respect to such estimates and when no reasonable estimate can be made, the provisional accounting may be based on the tax law in effect prior to the TCJA. The income tax provision for the six months ended June 30, 2018 reflects discrete tax expense with respect to a $1,090 adjustment made to our year-end provisional estimate of the one-time mandatory transition tax. The Company will continue to analyze the effects of the TCJA on its financial statements. Additional revised impacts with respect to the TCJA will be recorded as they are identified during the allowed measurement period prescribed by SAB No. 118. This measurement period extends up to one year from the enactment date.

The final impact of the TCJA may differ from the provisional amounts that have been recognized, possibly materially, due to, among other items, changes in the Company’s interpretation of the TCJA, legislative or administrative actions taken to clarify the intent of the statutory language which may differ from the Company’s current interpretation, any changes in accounting standards for income taxes made in response to the TCJA or any updates or changes to original estimates used to compute the provisional amounts. Updates to original estimates may include changes to earnings estimates as well as applicable foreign exchange rates.

The TCJA enacted certain provisions that take effect on January 1, 2018. These provisions include, but are not limited to, the new Global Intangible Low-Taxed Income (“GILTI”) tax rules. Due to the complexity of the new GILTI tax, the Company is continuing to evaluate the GILTI provision of the TCJA and its impact on the financial statements, which remains uncertain. Per recent guidance issued by the FASB, the Company is permitted to make an accounting policy election to either (1) treat the taxes incurred as a result of the GILTI provision as a current-period expense when incurred or (2) factor such amounts into its measurement of deferred taxes. At this time, the Company is electing to treat any tax expense incurred as a result of GILTI as a current-period expense.

With respect to operating results for the three and six months ended June 30, 2018, the Company has continued to incorporate an estimate of the GILTI income inclusion when estimating its U.S. GAAP annual effective tax rate. The Company expects this inclusion to be included in its 2018 U.S. taxable income. However, the estimated 2018 GILTI income inclusion may change materially as the Company continues to evaluate future legislative or administrative guidance that is put forth, any updates to assumptions and figures used for the current estimate or as a result of future tax planning or changes to the Company’s current structure and business.

15. Benefit Plans:

The following information is provided for (1) the Company-sponsored defined benefit pension plans covering employees in the U.S. and certain employees at its foreign subsidiaries, (2) the Company-sponsored unfunded plans to provide certain health care benefits to retired employees in the U.S. and Canada, and (3) the Company’s defined benefit supplementary retirement plans which provide benefits for certain U.S. employees in excess of qualified plan limitations.

27

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

Components of net periodic expense (benefit) are as follows:

Defined Benefit Pension Plans

	U.S.						Foreign
	Three months ended June 30,						Three months ended June 30,
	2018			2017			2018			2017
Service cost	$	223		$	304		$	845		$	941
Interest cost	2,369			2,536			1,608			1,254
Expected return on plan assets	(3,176		)	(3,061		)	(1,628		)	(923		)
Amortization of net loss	—			—			12			—
Curtailment gain recognized	(576		)	—			—			—
Net periodic expense (benefit)	$	(1,160	)	$	(221	)	$	837		$	1,272
	U.S.						Foreign
	Six months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Service cost	$	533		$	609		$	1,732		$	1,783
Interest cost	4,741			5,072			3,113			2,685
Expected return on plan assets	(6,350		)	(6,122		)	(2,947		)	(2,217		)
Amortization of net less	—			—			25			—
Curtailment gain recognized	(576		)	—			—			—
Net periodic expense (benefit)	$	(1,652	)	$	(441	)	$	1,923		$	2,251

Supplemental Retirement Plans

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Interest cost	$	110	$	123	$	220	$	246
Net periodic expense	$	110	$	123	$	220	$	246

Other Postretirement Benefit Plans

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Service cost	$	3		$	5		$	9		$	10
Interest cost	27			41			65			81
Amortization of prior service credit	(20		)	(20		)	(39		)	(39		)
Amortization of net gain	(11		)	(19		)	(22		)	(38		)
Net periodic expense (benefit)	$	(1	)	$	7		$	13		$	14

28

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

16. Commitments and Contingent Liabilities:

There is a risk of environmental impact in chemical manufacturing operations. The Company’s environmental policies and practices are designed to ensure compliance with existing laws and regulations and to minimize the possibility of significant environmental impact. The Company is also subject to various other lawsuits and claims with respect to matters such as governmental regulations, labor and other actions arising out of the normal course of business. While management believes that the liabilities resulting from such lawsuits and claims are not probable or reasonably estimable, certain accruals have been reflected in our condensed consolidated financial statements and are described in detail within this note.

The Company triggered the requirement of New Jersey’s Industrial Site Recovery Act (“ISRA”) statute with the PQ Holdings stock transfer/corporate merger in December 2004. As required under ISRA, a General Information Notice with respect to the Company’s two New Jersey locations was filed with the New Jersey Department of Environmental Protection (“NJDEP”) in December 2004 and again in July 2007. Based on an initial review of the facilities by the NJDEP in 2005, the Company estimated that $500 would be required for contamination assessment and removal work of one specific contaminant (polychlorinated biphenyls) that exceeded applicable NJDEP standards at these facilities, and had recorded a reserve for such amount as of December 31, 2005. During subsequent years, it was determined that additional assessment, removal and remediation work would be required and the reserve was increased to cover the estimated cost of such work. In addition, during this period, work had been performed and the reserve was reduced for actual costs incurred for the assessment and remediation work. Work at the Carlstadt facility has been completed and is closed from an ISRA standpoint, but as of June 30, 2018 and December 31, 2017, the Company has recorded a reserve of $948 and $842, respectively, for costs required for contamination assessment and removal work at Rahway. There may be additional costs related to the remediation of Rahway, but until further investigation takes place, the Company cannot reasonably estimate the amount of additional liability that may exist.

As part of a Delaware River Basin Commission (“DRBC”) required Pollutant Minimization Plan (“PMP”), in July 2013, the Company’s Chester facility conducted limited paint sampling for polychlorinated biphenyls (“PCBs”). Also, as part of demolition, repair and maintenance projects scheduled for the Company’s Baltimore facility in 2014, the Company conducted limited paint sampling during the fall of 2013 for waste categorization purposes. Paint samples were analyzed for PCB Aroclor 1254, the specific PCB congener commonly used in the manufacture of paint until the late 1970s. The Company’s analytical results indicated that PCB Aroclor 1254 is present in paint on some structures (e.g., piping, structural steel, tanks) in excess of the fifty (50) parts per million (“ppm”) regulatory threshold. Under the Toxic Substances Control Act (“TSCA”), there is no requirement to test in use paint for PCB content. However, once PCB content is identified at concentrations at or above the regulatory threshold, absent specific approval from the U.S. Environmental Protection Agency (“EPA”), the PCB-containing paint is regulated as an unauthorized use of PCBs, and the paint must be addressed. The Company abated painted surfaces that have tested positive for PCBs at levels exceeding 50 ppm at Baltimore in 2015 and early 2016. Similar abatement of painted structures as necessary at Chester have also been substantially completed. Characterization studies to evaluate whether soils have been impacted at Baltimore have been initiated as required under the TSCA, and have yet to commence at Chester. As of June 30, 2018 and December 31, 2017, the Company has recorded a reserve of $670 and $701, respectively, for the remediation costs of PCB impacted soils at the Company’s facilities.

In 2008, the Company sold the property of a manufacturing facility located in the United States to the local port authority. In 2009, the port authority commissioned an environmental investigation of portions of the property. In 2010, the port authority advised the Company of alleged soil and groundwater contamination on the property and alleged the Company liable for certain conditions. The Company received and reviewed the environmental investigation documentation and determined it may have liability with respect to some, but not all, of the alleged contamination. As of June 30, 2018 and December 31, 2017, the Company has recorded a reserve of $821 and $837, respectively, for costs related to this potential liability.

The Company has recorded a reserve of $1,107 and $1,245 as of June 30, 2018 and December 31, 2017, respectively, to address remaining subsurface remedial and wetlands/marsh management activities at the Company’s Martinez, CA site. Although currently a sulfuric acid regeneration plant, the site originally was operated by Mountain Copper Company (“Mococo”) as a copper smelter. Also, the site sold iron pyrite to various customers and allowed their customers to deposit waste iron pyrite cinder and slag on the site. The property is adjacent to Peyton Slough, where Mococo had a permitted discharge point from its process. In 1997, the San Francisco Bay Regional Water Quality Control Board (“RWQCB”) required characterization and remediation of Peyton Slough for Copper, Zinc and Acidic Soils. Various remediation activities were undertaken and completed, and the site has received final concurrence from the Army Corps with respect to the completed work. The RWQCB has agreed that Eco Services has achieved the goals for vegetative cover, but the current marsh condition is not sustainable without continued operation of the tide gates. The Company is continuing to work with the RWQCB on a plan to involve the County and work towards development of an alliance for operating, maintaining and funding the tide gates in the future.

29

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

As of June 30, 2018 and December 31, 2017, the Company has recorded a reserve of $1,080 and $1,220, respectively, for subsurface remediation and the Soil Vapor Extraction Project at the Company’s Dominguez, CA site. In the 1980s and 1990s, the EPA and the Los Angeles Regional Water Quality Control Board conducted investigations of the site due to historic chlorinated pesticide and chlorinated solvent use. Soil and groundwater beneath the site were impacted by chlorinated solvents and associated breakdown products, petroleum hydrocarbons, chlorinated pesticides and metals. A Corrective Measures Plan approved in October 2011 requires (1) soil vapor extraction (“SVE”) in affected areas, (2) covering of unpaved areas containing pesticide impacted soil, and (3) annual groundwater monitoring of the perched water-bearing zone. Installation of the SVE unit has been completed and startup has occurred. The California Department of Toxic Substances Control (“DTSC”) has granted conditional approval of the Company’s soil management, and monitoring and maintenance plans. Most recently, the DTSC is requiring the Company to delineate the PCE plume on the eastern boundary of the site. The Company has submitted an action plan to address this matter and is awaiting comments from the DTSC.

17. Reportable Segments:

Summarized financial information for the Company’s (1) Environmental Catalysts & Services and (2) Performance Materials & Chemicals reportable segments is shown in the following table:

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Net sales:
Silica Catalysts	$	17,347		$	20,045		$	33,820		$	37,185
Refining Services	112,071			103,947			212,785			198,088
Environmental Catalysts & Services(1)	129,418			123,992			246,605			235,273
Performance Chemicals	183,761			169,038			373,724			339,987
Performance Materials	126,538			99,470			189,280			153,243
Eliminations	(4,138		)	(2,404		)	(7,021		)	(4,521		)
Performance Materials & Chemicals	306,161			266,104			555,983			488,709
Inter-segment sales eliminations(2)	(866		)	(829		)	(1,678		)	(1,784		)
Total	$	434,713		$	389,267		$	800,910		$	722,198
Segment Adjusted EBITDA:(3)
Environmental Catalysts & Services(4)	$	64,864		$	64,311		$	123,285		$	120,678
Performance Materials & Chemicals	73,389			66,333			130,541			118,856
Total Segment Adjusted EBITDA(5)	$	138,253		$	130,644		$	253,826		$	239,534

⁽¹⁾ Excludes the Company’s proportionate share of sales from the Zeolyst International and Zeolyst C.V. joint ventures (collectively, the “Zeolyst Joint Venture”) accounted for using the equity method (see Note 10 to these condensed consolidated financial statements for further information). The proportionate share of sales is $49,513 and $30,661 for the three months ended June 30, 2018 and 2017, respectively. The proportionate share of sales is $87,862 and $63,369 for the six months ended June 30, 2018 and 2017, respectively.

⁽²⁾ The Company eliminates intersegment sales when reconciling to the Company’s consolidated statements of operations.

⁽³⁾ The Company defines Adjusted EBITDA as EBITDA adjusted for certain items as noted in the reconciliation below. Management evaluates the performance of its segments and allocates resources based on several factors, of which the primary measure is Adjusted EBITDA. Adjusted EBITDA should not be considered as an alternative to net income as an indicator of the Company’s operating performance. Adjusted EBITDA as defined by the Company may not be comparable with EBITDA or Adjusted EBITDA as defined by other companies.

⁽⁴⁾ The Adjusted EBITDA from the Zeolyst Joint Venture included in the Environmental Catalysts and Services segment is $17,874 for the three months ended June 30, 2018, which includes $13,616 of equity in net income plus $1,659 of amortization of investment in affiliate step-up plus $2,599 of joint venture depreciation, amortization and interest. The Adjusted EBITDA from the Zeolyst Joint Venture included in the Environmental Catalysts and Services segment is $13,205 for the three months ended June 30, 2017, which includes $8,675 of equity in net income plus $1,659 of amortization of investment in affiliate step-up plus $2,871 of joint venture depreciation, amortization and interest.

The Adjusted EBITDA from the Zeolyst Joint Venture included in the Environmental Catalysts and Services segment is $34,681 for the six months ended June 30, 2018, which includes $25,442 of equity in net income plus $3,317 of amortization of investment in affiliate step-up plus $5,922 of joint venture depreciation, amortization and interest. The Adjusted EBITDA from the Zeolyst Joint Venture included in the Environmental Catalysts and Services segment is $25,292 for the six months ended June 30, 2017, which includes $14,499 of equity in net income plus $5,283 of amortization of investment in affiliate step-up plus $5,510 of joint venture depreciation, amortization and interest.

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PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

⁽⁵⁾ Total Segment Adjusted EBITDA differs from the Company’s consolidated Adjusted EBITDA due to unallocated corporate expenses.

A reconciliation of net income (loss) attributable to PQ Group Holdings to Segment Adjusted EBITDA is as follows:

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018		2017
Reconciliation of net income (loss) attributable to PQ Group Holdings Inc. to Segment Adjusted EBITDA
Net income (loss) attributable to PQ Group Holdings Inc.	$	15,782		$	(1,609	)	$	15,996	$	(4,063	)
Provision for income taxes	13,649			3,007			13,120		97
Interest expense, net	27,221			48,176			56,384		94,961
Depreciation and amortization	46,983			42,620			95,471		83,206
Segment EBITDA	103,635			92,194			180,971		174,201
Unallocated corporate expenses	9,358			7,882			17,046		15,589
Joint venture depreciation, amortization and interest	2,599			2,871			5,922		5,510
Amortization of investment in affiliate step-up	1,659			1,658			3,317		5,282
Amortization of inventory step-up	—			—			1,603		871
Debt extinguishment costs	—			—			5,879		—
Net loss on asset disposals	4,752			2,577			5,904		2,925
Foreign currency exchange loss	6,757			14,370			11,820		16,356
Non-cash revaluation of inventory, including LIFO	121			—			5,047		2,479
Management advisory fees	—			1,250			—		2,500
Transaction and other related costs	257			2,955			685		4,334
Equity-based and other non-cash compensation	3,796			1,176			7,627		2,828
Restructuring, integration and business optimization expenses	2,405			1,351			3,484		3,052
Defined benefit pension plan cost	(402		)	685			148		1,409
Other	3,316			1,675			4,373		2,198
Segment Adjusted EBITDA	$	138,253		$	130,644		$	253,826	$	239,534

18. Restructuring and Other Related Costs:

The following table presents the components of restructuring and other related costs for the three and six months ended June 30, 2018 and 2017 included in other operating expense, net in the accompanying condensed consolidated statements of operations:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Severance and other employee costs related to legacy Eco restructuring plan	$	—	$	—	$	—	$	830
Severance and other employee costs related to performance materials plant closure	—		—		107		—
Other related costs	10		276		23		642
	$	10	$	276	$	130	$	1,472

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PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

Legacy Eco Restructuring Plan

On July 30, 2014, Eco Services Operations LLC (“Eco Services”), a newly formed Delaware limited liability company and indirect subsidiary of certain investment funds affiliated with CCMP Capital Advisors, LP, entered into an Asset Purchase Agreement with Solvay USA, Inc. (“Solvay”), a Delaware corporation, which provided for the sale, transfer and assignment by Solvay and the acquisition, acceptance and assumption by Eco Services, of substantially all of the assets of Solvay’s Eco Services business unit of Solvay’s regeneration and virgin sulfuric acid production business operations in the United States (the “2014 Acquisition”). Prior to the Asset Purchase Agreement with Solvay, Eco Services operated as a business unit within Solvay, which is an indirect, wholly owned subsidiary of Solvay SA.

Subsequent to the 2014 Acquisition, the Company initiated a restructuring plan designed to improve organizational efficiency and streamline the operations of Eco Services as a stand-alone company. The primary impact of the plan to the Company’s consolidated results of operations was the recognition of severance costs related to a reduction-in-force. These costs included benefits payable under ongoing Company severance plan arrangements, whereby payments are attributable to employee services rendered with benefits that accumulate over time. The liabilities and associated charges related to these severance costs are recognized by the Company when payment of the benefits becomes probable and estimable. Charges related to severance costs for the restructuring plan were $0 and $830 for the six months ended June 30, 2018 and 2017, respectively. No severance costs were incurred related to this plan for the three months ended June 30, 2018 and 2017.

Performance Materials Plant Closure

In September 2017, the Company approved and announced a plan to consolidate its manufacturing operations in Europe for the performance materials product group and close its facility in Kirchheimbolanden, Germany. The plan is part of the Company’s overall strategy with respect to the Acquisition (see Note 6 to these condensed consolidated financial statements) and the realization of cost and other synergies in connection with the transaction. The facility will remain in operation over the short term in a reduced capacity through the end of 2018. The Company is in the process of relocating the manufacturing equipment to other facilities, and is exploring strategic alternatives for the building and land. As a result, the Company classified the plant under the “held and used” accounting model, as it did not meet the criteria to be classified as “held for sale.”

As a result of the decision and announcement regarding the plant, the Company performed an impairment assessment related to the fixed assets of the facility upon the approval of the plan. In conducting the recoverability assessment, the Company compared the carrying value of the asset group that includes the plant to the undiscounted future cash flows of the asset group, noting that there was no indication of impairment. The Company does not anticipate the acceleration of depreciation on the fixed assets associated with the plant, as the Company continues to utilize the assets and ultimately expects to relocate the equipment.

In addition to the previously recognized charges related to the European restructuring, the Company recorded an additional severance charge related to the pending closure and other cost reductions for its performance materials product group in Europe of $107 for the six months ended June 30, 2018. There were no additional severance charges incurred during the three months ended June 30, 2018. The charge was fully recognized as of June 30, 2018 based on the types of benefits provided and the criteria for restructuring and exit cost recognition.

Although the Company does not expect to incur additional severance costs related to the closure, the Company will incur additional costs related to the dismantling, transportation and reassembly of the manufacturing equipment after the plant ceases operations.

Rollforward of Restructuring Liabilities

The activity in the accrued liability balance associated with the Company’s restructuring plans, all of which related to severance and other employee costs, was as follows for the six months ended June 30, 2018:

	Legacy Eco Restructuring Plan			Performance Materials Plant Closure			Total Restructuring Charges
Balance at December 31, 2017	$	215		$	3,123		$	3,338
Restructuring charges	—			107			107
Cash payments	(192		)	(1,924		)	(2,116		)
Foreign exchange impact	—			(7		)	(7		)
Balance at June 30, 2018	$	23		$	1,299		$	1,322

The remaining accrued liability balance associated with the restructuring plans at June 30, 2018 is expected to be paid in 2018.

32

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

Other Related Costs

The Company incurred severance and other costs of $10 and $276 for the three months ended June 30, 2018 and 2017, respectively, and $23 and $642 for the six months ended June 30, 2018 and 2017, respectively. These costs were not associated with formal restructuring plans and primarily related to severance charges for certain employees, professional fees and other expenses related to the Company’s organizational changes.

19. Earnings per Share:

Basic earnings per share is calculated as income (loss) available to common stockholders, divided by the weighted average number of common shares outstanding during the period. The weighted average number of common shares outstanding during the period for the computation of basic earnings per share excludes restricted stock awards that have legally been issued but are nonvested during the period, as the sale of these shares is prohibited pending satisfaction of certain vesting conditions by the award recipients in order to earn the rights to the shares.

Diluted earnings per share is calculated as income (loss) available to common stockholders, divided by the weighted average number of common and potential common shares outstanding during the period, if dilutive. Potential shares reflect unvested restricted stock awards and restricted stock units with service conditions as well as options to purchase common stock, which have been included in the diluted earnings per share calculation using the treasury stock method.

The reconciliation from basic to diluted weighted average shares outstanding is as follows:

	Three months ended June 30,		Six months ended June 30,
	2018	2017	2018	2017
Weighted average shares outstanding – Basic	133,222,463	104,015,815	133,188,303	103,981,851
Dilutive effect of unvested common shares and restricted stock units with service conditions and assumed stock option exercises and conversions	987,277	—	859,059	—
Weighted average shares outstanding – Diluted	134,209,740	104,015,815	134,047,362	103,981,851

Basic and diluted earnings per share are calculated as follows:

	Three months ended June 30,					Six months ended June 30,
	2018		2017			2018		2017
Numerator:
Net income (loss) attributable to PQ Group Holdings Inc.	$	15,782	$	(1,609	)	$	15,996	$	(4,063	)
Denominator:
Weighted average shares outstanding – Basic	133,222,463		104,015,815			133,188,303		103,981,851
Weighted average shares outstanding – Diluted	134,209,740		104,015,815			134,047,362		103,981,851
Net income (loss) per share:
Basic income (loss) per share	$	0.12	$	(0.02	)	$	0.12	$	(0.04	)
Diluted income (loss) per share	$	0.12	$	(0.02	)	$	0.12	$	(0.04	)

33

PQ GROUP HOLDINGS INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share amounts)

(unaudited)

The table below presents the details of the Company’s equity-based awards outstanding at the end of each respective period that were excluded from the calculation of diluted earnings per share:

	June 30,
	2018	2017
Restricted stock awards with performance only targets not yet achieved	1,659,050	1,769,447
Stock options with performance only targets not yet achieved	586,253	651,255
Anti-dilutive restricted stock awards and restricted stock units	—	341,880
Anti-dilutive stock options	621,747	1,539,266

Restricted stock awards and stock options with performance only vesting conditions are not included in the dilution calculation, as the performance targets have not been achieved as of the end of the respective periods. For the three and six months ended June 30, 2017, all of the Company’s restricted stock awards and stock options subject to service vesting conditions were considered anti-dilutive, as the Company was in a net loss position. Anti-dilutive awards are not included in the dilution calculation, as their inclusion would have the effect of increasing diluted income per share.

20. Supplemental Cash Flow Information:

The following table presents supplemental cash flow information for the Company:

	Six months ended June 30,
	2018		2017
Cash paid during the period for:
Income taxes	$	11,053	$	15,904
Interest	60,210		91,710
Non-cash investing activity:
Capital expenditures acquired on account but unpaid as of the period end	11,875		11,681

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the unaudited condensed consolidated balance sheets as of June 30, 2018 and 2017 to the total of the same amounts shown in the unaudited condensed consolidated statements of cash flows for the six months then ended:

	June 30,
	2018		2017
Cash and cash equivalents	$	52,553	$	50,457
Restricted cash included in prepaid and other current assets	1,332		4,976
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	$	53,885	$	55,433

21. Subsequent Events:

The Company has evaluated subsequent events since the balance sheet date and determined that there are no additional items to disclose.

34

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

Unless the context requires otherwise, references in this report to “PQ Group Holdings,” “the company,” “we,” “us” or “our” refer to PQ Group Holdings Inc. and its consolidated subsidiaries.

Forward-looking Statements

This periodic report on Form 10-Q (“Form 10-Q”) includes statements that express our opinions, expectations, beliefs, plans, objectives, assumptions or projections regarding future events or future results and therefore are, or may be deemed to be, “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 (the “Act”). The following cautionary statements are being made pursuant to the provisions of the Act and with the intention of obtaining the benefits of the “safe harbor” provisions of the Act. The words “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “expect,” “should” and similar expressions are intended to identify forward-looking statements. We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends that we believe may affect our financial condition, results of operations, business strategy, short- and long-term business operations and objectives, and financial needs. Examples of forward-looking statements include, but are not limited to, statements we make regarding our liquidity, including our belief that our current level of operations, cash and cash equivalents, cash flow from operations and borrowings under our credit facilities and other lines of credit will provide us adequate cash to fund the working capital, capital expenditure, debt service and other requirements for our business for the foreseeable future. These forward-looking statements are subject to a number of risks, uncertainties and assumptions. Moreover, we operate in a very competitive and rapidly changing environment and new risks emerge from time to time. It is not possible for our management to predict all risks, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements we may make. In light of these risks, uncertainties and assumptions, the forward-looking events and circumstances discussed herein may not occur and actual results could differ materially and adversely from those anticipated or implied in the forward-looking statements. Some of the key factors that could cause actual results to differ from our expectations include risks related to:

• our exposure to local business risks and regulations in different countries;

• general economic conditions;

• exchange rate fluctuations;

• legal and regulatory compliance;

• technological or other changes in our customers’ products;

• our and our competitors’ research and development;

• fluctuations in prices of raw materials and relationships with our key suppliers;

• substantial competition;

• non-payment or non-performance by our customers;

• reliance on a small number of customers;

• potential early termination or non-renewal of customer contracts in our refining services product group;

• reductions in highway safety spending;

• seasonal fluctuations in demand for some of our products;

• retention of certain key personnel;

• our expansion projects;

• potential product liability claims;

• existing and potential future government regulation;

• the extensive environmental, health and safety regulations to which we are subject;

• disruption of production and distribution of our products;

• our insurance coverage;

• product quality;

• our acquisition strategy;

• our joint venture investments;

35

• our failure to protect our intellectual property and infringement on the intellectual property rights of third parties;

• information technology risks;

• potential labor disruptions;

• litigation and other administrative and regulatory proceedings;

• our substantial indebtedness; and

• other factors set forth in Part I, “Item 1A. Risk Factors” in our Annual Report on For 10-K for the year ended December 31, 2017.

The forward-looking statements included herein are made only as of the date hereof. You should not rely upon forward-looking statements as predictions of future events. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee that the future results, levels of activity, performance or events and circumstances reflected in the forward-looking statements will be achieved or occur. Moreover, neither we nor any other person assumes responsibility for the accuracy and completeness of the forward-looking statements. We undertake no obligation to update publicly any forward-looking statements for any reason after the date of this Form 10-Q to conform these statements to actual results or to changes in our expectations.

Overview

We are a global provider of specialty catalysts, materials, chemicals, and services with leading supply positions across our portfolio. We compete in the global specialty chemicals and materials industry where we seek to focus on attractive, high-growth applications. Our products and services provide critical performance to our customers’ products and we are able to offer many of our customers regionally sourced materials to reduce costs and improve delivery logistics. We provide our customers with a combination of product technology and applications knowledge, global supply chain capabilities, and local production and logistical support.

We conduct operations through two reporting segments: (1) Environmental Catalysts and Services, and (2) Performance Materials and Chemicals. Our Environmental Catalysts and Services business consists of three product groups: silica catalysts, zeolite catalysts, and refining services. Our Environmental Catalysts and Services business is a leading global innovator and producer of catalysts for the refinery, emission control, and petrochemical industries and is also a leading provider of catalyst recycling services to the North American refining industry. We believe our products are critical for our customers in these growing applications and impart essential functionality in chemical and refining production processes and in emission control for engines. Our Performance Materials and Chemicals business consists of two product groups: performance chemicals and performance materials. Our Performance Materials and Chemicals business is a silicates and specialty materials producer with leading supply positions for the majority of our products sold in North America, Europe, South America, Australia and Asia serving diverse and growing end uses such as personal and industrial cleaning products, fuel efficient tires (“green tires”), surface coatings, and food and beverage. Our products are essential additives, ingredients, and precursors that are critical to the performance characteristics of our customers’ products, yet typically represent only a small portion of our customers’ overall end-product costs.

Key Performance Indicators

Adjusted EBITDA and Adjusted Net Income

Adjusted EBITDA and adjusted net income are financial measures that are not prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) and that we use to evaluate our operating performance, for business planning purposes and to measure our performance relative to that of our competitors. Adjusted EBITDA and adjusted net income are presented as key performance indicators as we believe these financial measures will enhance a prospective investor’s understanding of our results of operations and financial condition. EBITDA consists of net income (loss) attributable to PQ Group Holdings before interest, taxes, depreciation and amortization. Adjusted EBITDA consists of EBITDA adjusted for (i) non-operating income or expense, (ii) the impact of certain non-cash, nonrecurring or other items included in net income (loss) and EBITDA that we do not consider indicative of our ongoing operating performance, and (iii) depreciation, amortization and interest of our 50% share of the Zeolyst Joint Venture. Adjusted net income consists of net income (loss) attributable to PQ Group Holdings adjusted for (i) non-operating income or expense and (ii) the impact of certain non-cash, nonrecurring or other items included in net income (loss) that we do not consider indicative of our ongoing operating performance. We believe that these non-GAAP financial measures provide investors with useful financial metrics to assess our operating performance from period-to-period by excluding certain items that we believe are not representative of our core business.

You should not consider adjusted EBITDA and adjusted net income in isolation or as alternatives to the presentation of our financial results in accordance with GAAP. The presentation of our adjusted EBITDA and adjusted net income financial measures may differ from similar measures reported by other companies and may not be comparable to other similarly titled measures. In evaluating adjusted EBITDA and adjusted net income, you should be aware that we are likely to incur expenses similar to those eliminated in this presentation in the future and that certain of these items could be considered recurring in nature. Our presentation

36

of adjusted EBITDA and adjusted net income should not be construed as an inference that our future results will be unaffected by unusual or nonrecurring items. Reconciliations of adjusted EBITDA and adjusted net income to GAAP net income (loss) are included in the results of operations discussion that follows for each of the respective periods.

Key Factors and Trends Affecting Operating Results and Financial Condition

Sales

Our Environmental Catalysts and Services sales have grown primarily due to expansion into new applications, including emission control catalysts, polymer catalysts, and refining catalysts, as well as continued supply share gains. Sales in our Environmental Catalysts and Services segment are made on both a purchase order basis and pursuant to long-term contracts.

Historically, our Performance Materials and Chemicals business has experienced relatively stable demand both seasonally and throughout economic cycles, due to the diverse consumer and industrial end uses that our products serve. Expansions into new applications, including personal care and consumer cleaning, as well as share gains in existing end uses, have added to our sales growth. Product sales from our performance chemicals product group are made on both a purchase order basis and pursuant to long-term contracts. In the performance materials product group, sales have been driven by the growth of spending on repair, maintenance and upgrade of existing highways and the construction of new highways and roads by governments around the world. Product sales in our performance materials product group are made principally on a purchase order basis. There may be modest fluctuations in timing of orders, but orders are mainly driven by demand and general economic conditions.

Cost of Goods Sold

Cost of goods sold consists of variable product costs, fixed manufacturing expenses, depreciation expense and freight expenses. Variable product costs include all raw materials, energy and packaging costs that are directly related to the manufacturing process. Fixed manufacturing expenses include all plant employment costs, manufacturing overhead and periodic maintenance costs. The primary raw materials for our Environmental Catalysts and Services business include spent sulfuric acid, sulfur, sodium silicates, acids, bases, and certain metals. Most of our refining services contracts feature take-or-pay volume protection and/or price adjustments for commodity inputs, labor, the Chemical Engineering Index (U.S. chemical plant construction cost index) and natural gas. Spent acid for our refining services product group is supplied by customers for a nominal charge as part of their contracts. Over 87% of our refining services product group sales for the year ended December 31, 2017 were under contracts featuring price adjustments. The price adjustments generally reflect actual costs for producing acid and tend to protect us from volatility in labor, fixed costs and raw material pricing.

The primary raw materials used in the manufacture of products in our Performance Materials and Chemicals business include soda ash, industrial sand, aluminum trihydrate, sodium hydroxide, and cullet. For the year ended December 31, 2017 approximately 42% of sales with our largest sodium silicate customers in North America were made under contracts that include price adjustments for changes in the price of raw materials and natural gas. Under these contracts, there generally is a time lag of three to nine months for price changes to pass through, depending on the magnitude of the change in cost and other market dynamics. Freight expenses are generally passed through directly to customers.

While natural gas is not a direct feedstock for any product, all businesses use natural gas powered furnaces to heat raw materials and create the chemical reactions necessary to produce end-products. We maintain multiple suppliers wherever possible, hedge exposure to fluctuations in prices for natural gas purchases in the United States, make forward purchases of natural gas in the United States, Canada, and Europe to mitigate our exposure to price volatility, and structure our customer contracts when possible to allow for the pass-through of raw material and natural gas costs.

Joint Ventures

We account for our investments in our equity joint ventures under the equity method. Our largest joint venture, the Zeolyst Joint Venture, manufactures high performance specialty zeolite-based catalysts for use in the emissions control industry, the petrochemical industry and other areas of the broader chemicals industry. We share proportionally in the management of our joint ventures with the other parties to each such joint venture.

Industry

We compete in the specialty chemicals and materials industry. Our industry is characterized by constant development of new products and the need to support customers with new product innovation and technical services to meet their challenges. In addition, products must maintain consistent quality and be a reliable source of supply in order to meet the needs of customers. Many products in the specialty chemicals and materials industry benefit from economics that favor incumbent producers because the capital cost to expand existing capacity is typically significantly less than the capital cost necessary to build a new plant. Our industry is also characterized by the need to produce consistent quality in a safe and environmentally sustainable manner.

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Seasonality

Seasonal changes and weather conditions typically affect our performance materials and refining services product groups. In particular, our performance materials product group generally experiences lower sales and profit in the first and fourth quarters of the year because highway striping projects typically occur during warmer weather months. Additionally, our refining services product group typically experiences similar seasonal fluctuations as a result of higher demand for gasoline products in the summer months. As a result, our working capital requirements tend to be higher in the first and fourth quarters of the year, which can adversely affect our liquidity and cash flows. Because of this seasonality associated with certain of our product groups, results for any one quarter are not necessarily indicative of the results that may be achieved for any other quarter or for the full year.

Inflation

Inflationary pressures may have an adverse effect on us, impacting raw material costs and other operating costs, as well as resulting in higher fixed asset replacement costs. We attempt to manage these impacts with cost control, productivity improvements and contractual arrangements, as well as price increases to customers.

Foreign Currency

As a global business, we are subject to the impact of gains and losses on currency translations, which occur when the financial statements of foreign operations are translated into U.S. dollars. We operate a geographically diverse business with approximately 42% and 41% of our sales for the six months ended June 30, 2018 and the year ended December 31, 2017, respectively, in currencies other than the U.S. dollar. Because our consolidated financial results are reported in U.S. dollars, sales or earnings generated in currencies other than the U.S. dollar can result in a significant increase or decrease in the amount of those sales and earnings when translated to U.S. dollars. The foreign currencies to which we have the most significant exchange rate exposure include the Euro, British pound, Canadian dollar, Brazilian real and the Mexican peso.

Results of Operations

Three Months Ended June 30, 2018 Compared to the Three Months Ended June 30, 2017

Highlights

The following is a summary of our financial performance for the three months ended June 30, 2018 compared with the three months ended June 30, 2017.

Sales

• Net sales increased$45.4 million to $434.7 million. The increase in sales was primarily due to higher sales volumes and organic growth driven by favorable pass-through pricing and mix.

Gross Profit

• Gross profit increased$0.9 million to $108.4 million. Our increase in gross profit was primarily due to higher sales volumes which was partially offset by unfavorable manufacturing costs and product mix.

Operating Income

• Operating income decreased by $6.2 million to $49.0 million. Our operating income decreased due to the timing of plant maintenance costs and compensation related expenses for the three months ended June 30, 2018.

Equity in Net Income of Affiliated Companies

• Equity in net income of affiliated companies for the three months ended June 30, 2018 was $13.7 million, compared to $8.7 million for the three months ended June 30, 2017. The increase of $5.0 million was due to higher earnings generated by our Zeolyst Joint Venture for the three months ended June 30, 2018.

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The following is our unaudited condensed consolidated statements of operations and a summary of financial results for the three months ended June 30, 2018 and 2017:

	Three months ended June 30,						Change
	2018			2017			$			%
	(in millions, except percentages)
Sales	$	434.7		$	389.3		$	45.4		11.7	%
Cost of goods sold	326.3			281.8			44.5			15.8	%
Gross profit	108.4			107.5			0.9			0.8	%
Gross profit margin	24.9		%	27.6		%
Selling, general and administrative expenses	43.5			35.3			8.2			23.2	%
Other operating expense, net	15.9			17.0			(1.1		)	(6.5	)%
Operating income	49.0			55.2			(6.2		)	(11.2	)%
Operating income margin	11.3		%	14.1		%
Equity in net (income) from affiliated companies	(13.7		)	(8.7		)	(5.0		)	57.5	%
Interest expense, net	27.2			48.2			(21.0		)	(43.6	)%
Other expense, net	5.7			14.4			(8.7		)	(60.4	)%
Income (loss) before income taxes and noncontrolling interest	29.8			1.3			28.5			2,192.3	%
Provision for income taxes	13.6			3.0			10.6			353.3	%
Effective tax rate	45.8		%	224.9		%
Net income (loss)	16.2			(1.7		)	17.9			(1,052.9	)%
Less: Net income (loss) attributable to the noncontrolling interest	0.4			(0.1		)	0.5			(500.0	)%
Net income (loss) attributable to PQ Group Holdings Inc.	$	15.8		$	(1.6	)	$	17.4		(1,087.5	)%

Sales

	Three months ended June 30,						Change
	2018			2017			$			%
	(in millions, except percentages)
Sales:
Silica Catalysts	$	17.3		$	20.1		$	(2.8	)	(13.9	)%
Refining Services	112.1			103.9			8.2			7.9	%
Environmental Catalysts & Services	129.4			124.0			5.4			4.4	%
Performance Chemicals	183.8			169.0			14.8			8.8	%
Performance Materials	126.5			99.5			27.0			27.1	%
Eliminations	(4.1		)	(2.4		)	(1.7		)	70.8	%
Performance Materials & Chemicals	306.2			266.1			40.1			15.1	%
Inter-segment sales eliminations	(0.9		)	(0.8		)	(0.1		)	12.5	%
Total sales	$	434.7		$	389.3		$	45.4		11.7	%

Environmental Catalysts & Services: Sales in Environmental Catalysts and Services for the three months ended June 30, 2018 were $129.4 million, an increase of $5.4 million, or 4.4%, compared to sales of $124.0 million for the three months ended June 30, 2017. The increase in sales was primarily due to higher average selling price and customer mix of $6.8 million, which was partially offset by lower volumes of $1.6 million.

The higher average selling price and customer mix was driven by higher cost pass-through pricing in our virgin sulfuric acid product group and favorable product mix within our polyolefin catalysts product group. The decrease in volumes was driven by lower chemical synthesis catalysts sales due to the timing of customer order patterns, partially offset by higher sales of our virgin sulfuric acid product group.

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Performance Materials & Chemicals: Sales in Performance Materials and Chemicals for the three months ended June 30, 2018 were $306.2 million, an increase of $40.1 million, or 15.1%, compared to sales of $266.1 million for the three months ended June 30, 2017. The increase in sales was primarily due to higher sales volumes of $30.6 million, higher average selling price and favorable customer mix of $5.1 million and the favorable effects of foreign currency translation of $4.4 million.

The integration of Sovitec into our existing European operations, growth in ThermoDrop® sales, higher consumer product sales and sodium silicate industrial demand led to the increase in volumes. Higher average selling prices were principally a result of favorable cost pass-through pricing. The favorable effects of foreign currency were primarily driven by the stronger Euro and British Pound compared to the U.S. dollar.

Gross Profit

Gross profit for the three months ended June 30, 2018 was $108.4 million, an increase of $0.9 million, or 0.8%, compared with $107.5 million for the three months ended June 30, 2017. The increase in gross profit was due to higher volumes of $17.2 million, favorable customer pricing of $11.9 million and favorable foreign currency translation of $1.4 million, which was offset by unfavorable manufacturing costs of $18.9 million, unfavorable product mix of $8.3 million and higher depreciation expense of $2.4 million.

The integration of Sovitec into our existing European operations and higher consumer product sales volumes more than offset a decline in sales related to the timing of customer orders in our chemical synthesis catalysts product group. The unfavorable change in manufacturing costs was driven by higher raw material costs, some of which are passed through in price, and the timing of plant maintenance costs incurred at two of our refining services manufacturing facilities during the three months ended June 30, 2018. The unfavorable change in manufacturing costs was partially offset by lower highway product group costs, as start-up costs related to ThermoDrop® were incurred during the three months ended June 30, 2017. Unfavorable product mix was driven by increased volumes of lower-margin products.

Selling, General and Administrative Expenses

Selling, general and administrative expenses for the three months ended June 30, 2018 were $43.5 million, an increase of $8.2 million compared with $35.3 million for the three months ended June 30, 2017. The increase in selling, general and administrative expenses was due to higher stock compensation expense related to awards issued in conjunction with our initial public offering and additional costs related to Sovitec, which was acquired in June 2017.

Other Operating Expense, Net

Other operating expense, net for the three months ended June 30, 2018 was $15.9 million, a decrease of $1.1 million, compared with $17.0 million for the three months ended June 30, 2017. The decrease in other operating expense, net was due to incurring legal and professional fee costs in the prior year period related to our initial public offering, lower management advisory fees due to agreements terminated as a result of our initial public offering, lower transaction-related costs related to our June 2017 acquisition of Sovitec and the receipt of insurance proceeds totaling $1.0 million in the current period related to losses sustained as a result of Hurricane Harvey in August 2017 (of which $0.3 million was recorded in other operating expense, net).

Equity in Net Income of Affiliated Companies

Equity in net income of affiliated companies for the three months ended June 30, 2018 was $13.7 million, compared to $8.7 million for the three months ended June 30, 2017. The increase was primarily due to an increase of $4.9 million of earnings generated by our Zeolyst Joint Venture during the three months ended June 30, 2018. The increase in earnings generated by our Zeolyst Joint Venture was due to higher sales volumes of emission control and packaging & engineered plastics products.

Interest Expense, Net

Interest expense, net for the three months ended June 30, 2018 was $27.2 million, a decrease of $21.0 million, as compared with $48.2 million for the three months ended June 30, 2017. The decrease in interest expense is due to lower average debt balances, mainly as a result of the repayment of outstanding debt with the proceeds from our initial public offering in October 2017, and reduction in interest rates related to our refinancing efforts completed during the 2017 fiscal year and first quarter of 2018.

Other Expense, Net

Other expense, net for the three months ended June 30, 2018 was $5.7 million, a decrease of $8.7 million, as compared with $14.4 million for the three months ended June 30, 2017. The change in other expense, net primarily consisted of a decrease of $7.6 million of foreign currency losses driven by the non-permanent debt denominated in local currency and translated to U.S. dollars.

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Provision for Income Taxes

The provision for income taxes for the three months ended June 30, 2018 was $13.6 million compared to a $3.0 million provision for the three months ended June 30, 2017. The effective income tax rate for the three months ended June 30, 2018 was 45.8% compared to 224.9% for the three months ended June 30, 2017.

The Company’s effective income tax rate fluctuates based primarily on changes in income mix (including the effect of loss companies), impact of recently enacted U.S. tax law and changes in foreign exchange gains and losses, which create permanent differences in certain jurisdictions.

The difference between the U.S. federal statutory income tax rate and the Company’s effective income tax rate for the three months ended June 30, 2018 was mainly due to the tax effect of permanent differences related to foreign currency exchange gain or loss, inclusion of foreign earnings in the U.S. as a result of recently enacted tax law, pre-tax losses with no associated tax benefit, discrete impacts of opening balance sheet adjustments related to the Sovitec acquisition and state taxes.

Net Income (Loss) Attributable to PQ Group Holdings

For the foregoing reasons and after the effect of the non-controlling interest in earnings of subsidiaries for each period presented, net income attributable to PQ Group Holdings was $15.8 million for the three months ended June 30, 2018 compared with a net loss of $1.6 million for three months ended June 30, 2017.

Adjusted EBITDA

Summarized Segment Adjusted EBITDA information is shown below in the following table:

	Three months ended June 30,						Change
	2018			2017			$			%
	(in millions, except percentages)
Segment Adjusted EBITDA:(1)
Environmental Catalysts & Services(2)	$	64.9		$	64.3		$	0.6		0.9	%
Performance Materials & Chemicals	73.4			66.4			7.0			10.5	%
Total Segment Adjusted EBITDA(3)	138.3			130.7			7.6			5.8	%
Unallocated corporate costs	(9.4		)	(7.9		)	(1.5		)	19.0	%
Total Adjusted EBITDA	$	128.9		$	122.8		$	6.1		5.0	%

⁽¹⁾  We define Segment Adjusted EBITDA as EBITDA adjusted for certain items as noted in the reconciliation below. Our management evaluates the performance of our segments and allocates resources based primarily on Segment Adjusted EBITDA. Segment Adjusted EBITDA does not represent cash flow for periods presented and should not be considered as an alternative to net income as an indicator of our operating performance or as an alternative to cash flows as a source of liquidity. Segment Adjusted EBITDA may not be comparable with EBITDA or Adjusted EBITDA as defined by other companies.

⁽²⁾  The Adjusted EBITDA from our Zeolyst Joint Venture included in the Environmental Catalysts and Services segment is $17.9 million for the three months ended June 30, 2018, which includes $13.6 million of equity in net income, excluding $1.7 million of amortization of investment in affiliate step-up plus $2.6 million of joint venture depreciation, amortization and interest. The Adjusted EBITDA from our Zeolyst Joint Venture included in the Environmental Catalysts and Services segment is $13.2 million for the three months ended June 30, 2017, which includes $8.6 million of equity in net income, excluding $1.7 million of amortization of investment in affiliate step-up plus $2.9 million of joint venture depreciation, amortization and interest.

⁽³⁾  Our total Segment Adjusted EBITDA differs from our total consolidated Adjusted EBITDA due to unallocated corporate expenses.

Adjusted EBITDA for the three months ended June 30, 2018 was $128.9 million, an increase of $6.1 million, or 5.0%, compared with $122.8 million for the three months ended June 30, 2017.

Environmental Catalysts & Services: Adjusted EBITDA for the three months ended June 30, 2018 was $64.9 million, an increase of $0.6 million, or 0.9%, compared with $64.3 million for the three months ended June 30, 2017.

The increase in Adjusted EBITDA was driven primarily by increased earnings generated by our Zeolyst Joint Venture due to higher sales volumes of emission control and packaging & engineered plastics products. This was partly offset by lower chemical synthesis catalysts sales volumes related to the timing of customer orders.

Performance Materials & Chemicals: Adjusted EBITDA for the three months ended June 30, 2018 was $73.4 million, an increase of $7.0 million, or 10.5%, compared with $66.4 million for the three months ended June 30, 2017.

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The increase in Adjusted EBITDA was due to higher contribution from sodium silicate and North American highway product group sales and the integration of Sovitec into our European operations, which was partially offset by higher fixed costs.

A reconciliation of net income (loss) attributable to PQ Group Holdings to Segment Adjusted EBITDA is as follows:

	Three months ended June 30,
	2018			2017
	(in millions)
Reconciliation of net income (loss) attributable to PQ Group Holdings Inc. to Segment Adjusted EBITDA
Net income (loss) attributable to PQ Group Holdings Inc.	$	15.8		$	(1.6	)
Provision for income taxes	13.6			3.0
Interest expense, net	27.2			48.2
Depreciation and amortization	47.0			42.6
EBITDA	103.6			92.2
Joint venture depreciation, amortization and interest(a)	2.6			2.9
Amortization of investment in affiliate step-up(b)	1.7			1.7
Net loss on asset disposals(c)	4.8			2.6
Foreign currency exchange loss(d)	6.8			14.4
Non-cash revaluation of inventory, including LIFO	0.1			—
Management advisory fees(e)	—			1.3
Transaction and other related costs(f)	0.3			3.0
Equity-based compensation	3.8			1.2
Restructuring, integration and business optimization expenses(g)	2.4			1.4
Defined benefit pension plan cost(h)	(0.4		)	0.7
Other(i)	3.2			1.4
Adjusted EBITDA	128.9			122.8
Unallocated corporate expenses	9.4			7.9
Total Segment Adjusted EBITDA	$	138.3		$	130.7

^(a)  We use Adjusted EBITDA as a performance measure to evaluate our financial results. Because our Environmental Catalysts and Services segment includes our 50% interest in our Zeolyst Joint Venture, we include an adjustment for our 50% proportionate share of depreciation, amortization and interest expense of our Zeolyst Joint Venture.

^(b)  Represents the amortization of the fair value adjustments associated with the equity affiliate investment in our Zeolyst Joint Venture as a result of the combination of the businesses of PQ Holdings Inc. and Eco Services Operations LLC in May 2016 (the “Business Combination”). We determined the fair value of the equity affiliate investment and the fair value step-up was then attributed to the underlying assets of our Zeolyst Joint Venture. Amortization is primarily related to the fair value adjustments associated with inventory, fixed assets and intangible assets, including customer relationships and technical know-how.

^(c)  We do not have a history of significant asset disposals. However, when asset disposals occur, we remove the impact of net gain/loss of the disposed asset because such impact primarily reflects the non-cash write-off of long-lived assets no longer in use.

^(d)  Reflects the exclusion of the negative or positive transaction gains and losses of foreign currency in the income statement primarily related to the Euro denominated term loan (which was settled as part of the February 2018 term loan refinancing) and the non-permanent intercompany debt denominated in local currency translated to U.S. dollars.

^(e)  Reflects consulting fees paid to CCMP and affiliates of INEOS for consulting services that include certain financial advisory and management services. These payments ceased upon the closing of our initial public offering.

^(f)  Relates to certain transaction costs described in our condensed consolidated financial statements as well as other costs related to several transactions that are completed, pending or abandoned and that we believe are not representative of our ongoing business operations.

^(g)  Includes the impact of restructuring, integration and business optimization expenses which are incremental costs that are not representative of our ongoing business operations.

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^(h)  Represents adjustments for defined benefit pension plan costs in our statement of operations. More than two-thirds of our defined benefit pension plan obligations are under defined benefit pension plans that are frozen, and the remaining obligations primarily relate to plans operated in certain of our non-U.S. locations that, pursuant to jurisdictional requirements, cannot be frozen. As such, we do not view such expenses as core to our ongoing business operations.

⁽ⁱ⁾  Other costs consist of certain expenses that are not core to our ongoing business operations, including environmental remediation-related costs associated with the legacy operations of our business prior to the Business Combination, capital and franchise taxes, non-cash asset retirement obligation accretion and the initial implementation of procedures to comply with Section 404 of the Sarbanes-Oxley Act. Included in this line-item are rounding discrepancies that may arise from rounding from dollars (in thousands) to dollars (in millions).

Adjusted Net Income

Summarized adjusted net income information is shown below in the following table:

	Three months ended June 30,
	2018			2017
	(in millions)
Reconciliation of net income (loss) attributable to PQ Group Holdings Inc. to Adjusted Net Income(1)(2)
Net income (loss) attributable to PQ Group Holdings Inc.	$	15.8		$	(1.6	)
Amortization of investment in affiliate step-up(b)	1.0			0.9
Net loss on asset disposals(d)	3.1			1.4
Foreign currency exchange loss(d)	5.2			9.5
Management advisory fees(e)	—			0.7
Transaction and other related costs(f)	0.2			1.7
Equity-based compensation	2.5			0.6
Restructuring, integration and business optimization expenses(g)	1.6			0.7
Defined benefit pension plan cost(h)	(0.3		)	0.4
Other(i)	2.0			1.0
Adjusted Net Income, including non-cash GILTI tax	$	31.1		$	15.3
Impact of non-cash GILTI tax(3)	5.0			—
Impact of tax reform(4)	1.1			—
Adjusted Net Income	$	37.2		$	15.3

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⁽¹⁾ We define adjusted net income as net income (loss) attributable to PQ Group Holdings adjusted for non-operating income or expense and the impact of certain non-cash or other items that are included in net income (loss) that we do not consider indicative of our ongoing operating performance. Adjusted net income is presented as a key performance indicator as we believe it will enhance a prospective investor’s understanding of our results of operations and financial condition. Adjusted net income may not be comparable with net income or adjusted net income as defined by other companies.

⁽²⁾ Refer to the Adjusted EBITDA notes above for more information with respect to each adjustment.

⁽³⁾   Amount represents the impact to tax expense associated with the Global Intangible Low Taxed Income (“GILTI”) provisions of the Tax Cuts and Jobs Act of 2017 (“TCJA”). Beginning January 1, 2018, GILTI results in taxation of “excess of foreign earnings”, which is defined as amounts greater than a 10% rate of return on applicable foreign tangible asset basis. The Company is required to record incremental tax provision impact with respect to GILTI as a result of having historical U.S. Net Operating Loss (“NOL”) amounts to offset the GILTI taxable income inclusion. This NOL utilization precludes us from recognizing foreign tax credits (“FTCs”) which would otherwise help offset the tax impacts of GILTI. No FTCs will be recognized with respect to GILTI until our cumulative NOL balance has been exhausted. Because the GILTI provision does not impact our cash taxes (given available U.S. NOLs), and given that we expect to recognize FTCs to offset GILTI impacts once the NOLs are exhausted, we do not view this item as a component of core operations.

⁽⁴⁾   Represents the provisional adjustment for the impact of the U.S. Tax Cuts and Jobs Act of 2017 recorded in Net Income.

The adjustments to net income (loss) attributable to PQ Group Holdings Inc. are shown net of applicable tax rates which range between 33.2% and 43.8% for the three months ended June 30, 2018 and June 30, 2017, except for the foreign currency exchange loss for which the tax is calculated as a discrete item using the applicable statutory income tax rates.

Results of Operations

Six Months Ended June 30, 2018 Compared to the Six Months Ended June 30, 2017

Highlights

The following is a summary of our financial performance for the six months ended June 30, 2018 compared with the six months ended June 30, 2017.

Sales

• Net sales increased$78.7 million to $800.9 million. The increase in sales was primarily due to higher sales volumes, organic growth driven by favorable price and mix and the favorable effects of foreign currency translation.

Gross Profit

• Gross profit decreased$3.6 million to $186.5 million. Our decrease in gross profit was primarily due to unfavorable manufacturing costs and mix, which was partially offset by higher average customer prices, higher sales volumes and the favorable effects of foreign currency translation.

Operating Income

• Operating income decreased by $15.5 million to $77.2 million. Our decrease in operating income was primarily due to the decrease in gross profit and higher compensation related expenses for the six months ended June 30, 2018.

Equity in Net Income of Affiliated Companies

• Equity in net income of affiliated companies for the six months ended June 30, 2018 was $25.5 million, compared with $14.6 million for the six months ended June 30, 2017. The increase was due to an increase in earnings of $9.0 million generated by our Zeolyst Joint Venture during the six months ended June 30, 2018 as compared to the six months ended June 30, 2017 and $2.0 million of lower amortization on the fair value step-up of the underlying assets of our Zeolyst Joint Venture.

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The following is our unaudited condensed consolidated statements of operations and a summary of financial results for the six months ended June 30, 2018 and 2017.

	Six months ended June 30,						Change
	2018			2017			$			%
	(in millions, except percentages)
Sales	$	800.9		$	722.2		$	78.7		10.9	%
Cost of goods sold	614.4			532.1			82.3			15.5	%
Gross profit	186.5			190.1			(3.6		)	(1.9	)%
Gross profit margin	23.3		%	26.3		%
Selling, general and administrative expenses	84.1			70.1			14.0			20.0	%
Other operating expense, net	25.2			27.3			(2.1		)	(7.7	)%
Operating income	77.2			92.7			(15.5		)	(16.7	)%
Operating income margin	9.6		%	12.8		%
Equity in net (income) from affiliated companies	(25.5		)	(14.6		)	(10.9		)	74.7	%
Interest expense, net	56.4			95.0			(38.6		)	(40.6	)%
Debt extinguishment costs	5.9			—			5.9
Other expense, net	10.6			16.1			(5.5		)	(34.2	)%
Income (loss) before income taxes and noncontrolling interest	29.8			(3.8		)	33.6			(884.2	)%
Provision for income taxes	13.1			0.1			13.0			13,000.0	%
Effective tax rate	44.0		%	(2.5		)%
Net income (loss)	16.7			(3.9		)	20.6			(528.2	)%
Less: Net income (loss) attributable to the noncontrolling interest	0.7			0.1			0.6			600.0	%
Net income (loss) attributable to PQ Group Holdings Inc.	$	16.0		$	(4.0	)	$	20.0		(500.0	)%

Sales

	Six months ended June 30,						Change
	2018			2017			$			%
	(in millions, except percentages)
Sales:
Silica Catalysts	$	33.8		$	37.2		$	(3.4	)	(9.1	)%
Refining Services	212.8			198.1			14.7			7.4	%
Environmental Catalysts & Services	246.6			235.3			11.3			4.8	%
Performance Chemicals	373.7			340.0			33.7			9.9	%
Performance Materials	189.3			153.2			36.1			23.6	%
Eliminations	(7.0		)	(4.5		)	(2.5		)	55.6	%
Performance Materials & Chemicals	556.0			488.7			67.3			13.8	%
Inter-segment sales eliminations	(1.7		)	(1.8		)	0.1			(5.6	)%
Total sales	$	800.9		$	722.2		$	78.7		10.9	%

Environmental Catalysts & Services: Sales in Environmental Catalysts and Services for the six months ended June 30, 2018 were $246.6 million, an increase of $11.3 million, or 4.8%, compared to sales of $235.3 million for the six months ended June 30, 2017. The increase in sales was primarily due to higher average selling price and customer mix of $13.2 million, which was partially offset by lower volumes of $2.8 million.

The higher average selling price and customer mix was driven by higher cost pass-through pricing in our virgin sulfuric acid product group and favorable product mix within our polyolefin catalysts product group. The decrease in volumes was driven by lower chemical synthesis catalysts sales due to the timing of customer orders, partially offset by higher sales of our virgin sulfuric acid product group.

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Performance Materials & Chemicals: Sales in Performance Materials and Chemicals for the six months ended June 30, 2018 were $556.0 million, an increase of $67.3 million, or 13.8%, compared to sales of $488.7 million for the six months ended June 30, 2017. The increase in sales was primarily due to favorable volumes of $40.7 million, the favorable effects of foreign currency translation of $16.9 million and higher average selling price and customer mix of $9.7 million.

The increase in volumes within Performance Materials and Chemicals was primarily driven by the integration of Sovitec into our existing European operations, growth in ThermoDrop® sales, higher consumer product sales and sodium silicate industrial demand. Higher average selling prices were principally a result of favorable cost pass-through pricing. The favorable effects of foreign currency were primarily driven by the stronger Euro and British Pound as compared to the U.S. dollar.

Gross Profit

Gross profit for the six months ended June 30, 2018 was $186.5 million, a decrease of $3.6 million, or 1.9%, compared with $190.1 million for the six months ended June 30, 2017. The decrease in gross profit was due to higher manufacturing costs of $34.5 million, unfavorable product mix of $11.5 million and higher depreciation expense of $3.8 million, which was partially offset by favorable pricing of $22.9 million, higher volumes of $18.8 million and the favorable effects of foreign currency translation of $4.5 million.

The unfavorable change in manufacturing costs was driven by higher raw material costs, some of which are passed through in price, increased production and labor inflation costs and the timing of plant maintenance costs incurred at three of our refining services manufacturing facilities. The unfavorable change in manufacturing costs was partially offset by lower highway product group costs, as start-up costs related to ThermoDrop® were incurred during the six months ended June 30, 2017. Unfavorable product mix was driven by increased volumes of lower-margin products. The higher average selling prices were principally a result of favorable cost pass through pricing, which offsets a portion of the unfavorable change in manufacturing costs. The increase in volumes was due to strong North American highway safety sales led by our ThermoDrop® product, increased sales of consumer products in emerging markets and Asia, higher custom catalyst demand and stronger virgin and regenerated sulfuric acid demand.

Selling, General and Administrative Expenses

Selling, general and administrative expenses for the six months ended June 30, 2018 were $84.1 million, an increase of $14.0 million, or 20.0%, compared with $70.1 million for the six months ended June 30, 2017. The increase in selling, general and administrative expenses was due to higher compensation related expenses due to an increase in employee headcount, higher stock compensation expense related to awards issued in conjunction with our initial public offering and increased professional fees.

Other Operating Expense, Net

Other operating expense, net for the six months ended June 30, 2018 was $25.2 million, a decrease of $2.1 million, or 7.7%, compared with $27.3 million for the six months ended June 30, 2017. The decrease in other operating expense, net was due to incurring legal and professional fee costs in the prior year period related to our initial public offering, lower management advisory fees due to agreements terminated as a result of our initial public offering, lower transaction-related costs related to our June 2017 acquisition of Sovitec and the receipt of insurance proceeds totaling $2.5 million in the current period related to losses sustained as a result of Hurricane Harvey in August 2017 (of which $1.6 million was recorded in other operating expense, net). Offsetting the decrease in other operating expense, net was an increase in amortization expense related to the intangible assets identified as part of the Sovitec acquisition.

Equity in Net Income of Affiliated Companies

Equity in net income of affiliated companies for the six months ended June 30, 2018 was $25.5 million, an increase of $10.9 million, compared with income of $14.6 million for the six months ended June 30, 2017. The increase in earnings generated by our Zeolyst Joint Venture was due to higher sales for emission control and packaging & engineered plastics products, which was partially offset by increased fixed and production costs.

Interest Expense, Net

Interest expense, net for the six months ended June 30, 2018 was $56.4 million, a decrease of $38.6 million, as compared with $95.0 million for the six months ended June 30, 2017. The decrease in interest expense is due to lower average debt balances, mainly as a result of the repayment of outstanding debt with the proceeds from our initial public offering in October 2017, and reduction in interest rates related to our refinancing efforts completed during the 2017 fiscal year and first quarter of 2018.

Debt Extinguishment Costs

Debt extinguishment costs for the six months ended June 30, 2018 and 2017 were $5.9 million and $0.0 million, respectively. On February 8, 2018 we refinanced our existing senior secured term loan facility with a new $1,267.0 million senior secured term loan facility to reduce the applicable interest rates. The company recorded $2.1 million of new creditor and third-party financing fees as debt extinguishment costs. In addition, previous unamortized deferred financing costs of $1.4 million and original issue discount of $2.4 million associated with the existing senior secured term loan facility were written off as debt extinguishment costs.

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Other Expense, Net

Other expense, net was $10.6 million for the six months ended June 30, 2018, a favorable change of $5.5 million, compared with other expense, net of $16.1 million for the six months ended June 30, 2017. The change in other expense, net primarily consisted of a decrease of $4.6 million of foreign currency losses mainly driven by the February 8, 2018 refinancing of our Euro-denominated term loan and the non-permanent debt denominated in local currency and translated to U.S. dollars.

Provision for Income Taxes

The provision for income taxes for the six months ended June 30, 2018 was $13.1 million compared to a $0.1 million provision for the six months ended June 30, 2017. The effective income tax rate for the six months ended June 30, 2018 was 44.0% compared to (2.5)% for the six months ended June 30, 2017.

The Company’s effective income tax rate fluctuates based primarily on changes in income mix (including the effect of loss companies), impact of recently enacted U.S. tax law and changes in foreign exchange gains and losses, which create permanent differences in certain jurisdictions.

The difference between the U.S. federal statutory income tax rate and the Company’s effective income tax rate for the six months ended June 30, 2018 was mainly due to the tax effect of permanent differences related to foreign currency exchange gain or loss, inclusion of foreign earnings in the U.S. as a result of recently enacted tax law, pre-tax losses with no associated tax benefit, discrete impacts of opening balance sheet adjustments related to the Sovitec acquisition and state taxes.

Net Income (Loss) Attributable to PQ Group Holdings

For the foregoing reasons and after the effect of the non-controlling interest in earnings of subsidiaries for each period presented, net income attributable to PQ Group Holdings Inc. was $16.0 million for the six months ended June 30, 2018 as compared to a net loss of $4.0 million for the six months ended June 30, 2017.

Adjusted EBITDA

Summarized Segment Adjusted EBITDA information is shown below in the following table:

	Six months ended June 30,						Change
	2018			2017			$			%
	(in millions, except percentages)
Segment Adjusted EBITDA:(1)
Environmental Catalysts & Services(2)	$	123.3		$	120.7		$	2.6		2.2	%
Performance Materials & Chemicals	130.5			118.9			11.6			9.8	%
Total Segment Adjusted EBITDA(3)	253.8			239.6			14.2			5.9	%
Unallocated corporate costs	(17.0		)	(15.6		)	(1.4		)	9.0	%
Total Adjusted EBITDA	$	236.8		$	224.0		$	12.8		5.7	%

⁽¹⁾  We define Segment Adjusted EBITDA as EBITDA adjusted for certain items as noted in the reconciliation below. Our management evaluates the performance of our segments and allocates resources based primarily on Segment Adjusted EBITDA. Segment Adjusted EBITDA does not represent cash flow for periods presented and should not be considered as an alternative to net income as an indicator of our operating performance or as an alternative to cash flows as a source of liquidity. Segment Adjusted EBITDA may not be comparable with EBITDA or Adjusted EBITDA as defined by other companies.

⁽²⁾  The Adjusted EBITDA from the Zeolyst Joint Venture included in the Environmental Catalyst and Services segment is $34.7 million for the six months ended June 30, 2018, which includes $25.4 million of equity in net income, excluding $3.3 million of amortization of investment in affiliate step-up plus $5.9 million of joint venture depreciation, amortization and interest. The Adjusted EBITDA from the Zeolyst Joint Venture included in the Environmental Catalyst and Services segment is $25.3 million for the six months ended June 30, 2017, which includes $14.5 million of equity in net income, excluding $5.3 million of amortization of investment in affiliate step-up plus $5.5 million of joint venture depreciation, amortization and interest.

⁽³⁾  Our total Segment Adjusted EBITDA differs from our total consolidated Adjusted EBITDA due to unallocated corporate expenses.

Adjusted EBITDA for the six months ended June 30, 2018 was $236.8 million, an increase of $12.8 million, or 5.7%, compared with $224.0 million for the six months ended June 30, 2017.

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Environmental Catalysts & Services: Adjusted EBITDA for the six months ended June 30, 2018 was $123.3 million, an increase of $2.6 million, or 2.2%, compared with $120.7 million for the six months ended June 30, 2017.

The increase in Adjusted EBITDA was driven primarily by increased earnings generated by our Zeolyst Joint Venture due to higher sales volumes of aromatic catalyst and catalyst sales for emission control, higher cost pass-through pricing in our virgin sulfuric acid product group and insurance proceeds from Hurricane Harvey. The increase in Adjusted EBITDA was partially offset by lower chemical synthesis catalysts sales due to the timing of customer order patterns, increased fixed costs and plant maintenance costs incurred at three of our refining services facilities.

Performance Materials & Chemicals: Adjusted EBITDA for the six months ended June 30, 2018 was $130.5 million, an increase of $11.6 million, or 9.8%, compared with $118.9 million for the six months ended June 30, 2017.

The increase in Adjusted EBITDA was due to higher contribution margins from sodium silicate and North American highway product group sales, the integration of Sovitec into our European operations and the favorable effects of foreign currency translation, which was partially offset by higher fixed costs.

A reconciliation of net income (loss) attributable to PQ Group Holdings to Segment Adjusted EBITDA is as follows:

	Six months ended June 30,
	2018		2017
	(in millions)
Reconciliation of net income (loss) attributable to PQ Group Holdings Inc. to Segment Adjusted EBITDA
Net income (loss) attributable to PQ Group Holdings Inc.	$	16.0	$	(4.0	)
Provision for income taxes	13.1		0.1
Interest expense, net	56.4		95.0
Depreciation and amortization	95.5		83.2
EBITDA	181.0		174.3
Joint venture depreciation, amortization and interest(a)	5.9		5.5
Amortization of investment in affiliate step-up(b)	3.3		5.3
Amortization of inventory step-up(c)	1.6		0.9
Debt extinguishment costs	5.9		—
Net loss on asset disposals(d)	5.9		2.9
Foreign currency exchange loss(e)	11.8		16.4
Non-cash revaluation of inventory, including LIFO	5.0		2.5
Management advisory fees(f)	—		2.5
Transaction and other related costs(g)	0.7		4.3
Equity-based compensation	7.6		2.8
Restructuring, integration and business optimization expenses(h)	3.5		3.1
Defined benefit pension plan cost(i)	0.1		1.4
Other(j)	4.5		2.1
Adjusted EBITDA	236.8		224.0
Unallocated corporate expenses	17.0		15.6
Total Segment Adjusted EBITDA	$	253.8	$	239.6

^(a)  We use Adjusted EBITDA as a performance measure to evaluate our financial results. Because our Environmental Catalysts and Services segment includes our 50% interest in our Zeolyst Joint Venture, we include an adjustment for our 50% proportionate share of depreciation, amortization and interest expense of our Zeolyst Joint Venture.

^(b)  Represents the amortization of the fair value adjustments associated with the equity affiliate investment in our Zeolyst Joint Venture as a result of the Business Combination. We determined the fair value of the equity affiliate investment and the fair value step-up was then attributed to the underlying assets of our Zeolyst Joint Venture. Amortization is primarily related to the fair value adjustments associated with inventory, fixed assets and intangible assets, including customer relationships and technical know-how.

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^(c)  As a result of the Sovitec acquisition and the Business Combination, there was a step-up in the fair value of inventory, which is amortized through cost of goods sold in the statement of operations.

^(d)  We do not have a history of significant asset disposals. However, when asset disposals occur, we remove the impact of net gain/loss of the disposed asset because such impact primarily reflects the non-cash write-off of long-lived assets no longer in use.

^(e)  Reflects the exclusion of the negative or positive transaction gains and losses of foreign currency in the income statement primarily related to the Euro denominated term loan (which was settled as part of the February 2018 term loan refinancing) and the non-permanent intercompany debt denominated in local currency translated to U.S. dollars.

^(f)  Reflects consulting fees paid to CCMP and affiliates of INEOS for consulting services that include certain financial advisory and management services. These payments ceased as of the closing of our initial public offering.

^(g)  Relates to certain transaction costs described in our condensed consolidated financial statements as well as other costs related to several transactions that are completed, pending or abandoned and that we believe are not representative of our ongoing business operations.

^(h)  Includes the impact of restructuring, integration and business optimization expenses which are incremental costs that are not representative of our ongoing business operations.

⁽ⁱ⁾  Represents adjustments for defined benefit pension plan costs in our statement of operations. More than two-thirds of our defined benefit pension plan obligations are under defined benefit pension plans that are frozen, and the remaining obligations primarily relate to plans operated in certain of our non-U.S. locations that, pursuant to jurisdictional requirements, cannot be frozen. As such, we do not view such expenses as core to our ongoing business operations.

^(j)  Other costs consist of certain expenses that are not core to our ongoing business operations, including environmental remediation-related costs associated with the legacy operations of our business prior to the Business Combination, capital and franchise taxes, non-cash asset retirement obligation accretion and the initial implementation of procedures to comply with Section 404 of the Sarbanes-Oxley Act. Included in this line-item are rounding discrepancies that may arise from rounding from dollars (in thousands) to dollars (in millions).

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Adjusted Net Income

Summarized adjusted net income information is shown below in the following table:

	Six months ended June 30,
	2018		2017
	(in millions)
Reconciliation of net loss attributable to PQ Group Holdings Inc. to Adjusted Net Income(1)(2)
Net loss attributable to PQ Group Holdings Inc.	$	16.0	$	(4.0	)
Amortization of investment in affiliate step-up(b)	2.2		3.0
Amortization of inventory step-up(c)	1.1		0.5
Debt extinguishment costs	4.1		—
Net loss on asset disposals(d)	3.9		1.6
Foreign currency exchange loss(e)	8.1		9.8
Non-cash revaluation of inventory, including LIFO	3.4		1.4
Management advisory fees(f)	—		1.4
Transaction and other related costs(g)	0.5		2.4
Equity-based compensation	5.1		1.6
Restructuring, integration and business optimization expenses(h)	2.3		1.7
Defined benefit pension plan cost(i)	0.1		0.8
Other(j)	2.7		1.2
Adjusted Net Income, including non-cash GILTI tax	$	49.5	$	21.4
Impact of non-cash GILTI tax(3)	7.5		—
Impact of tax reform(4)	1.1		—
Adjusted Net Income	$	58.1	$	21.4

⁽¹⁾ We define adjusted net income as net loss attributable to PQ Group Holdings adjusted for non-operating income or expense and the impact of certain non-cash or other items that are included in net income that we do not consider indicative of our ongoing operating performance. Adjusted net income is presented as a key performance indicator as we believe it will enhance a prospective investor’s understanding of our results of operations and financial condition. Adjusted net income may not be comparable with net income or adjusted net income as defined by other companies.

⁽²⁾   Refer to the Adjusted EBITDA notes above for more information with respect to each adjustment.

⁽³⁾  Amount represents the impact to tax expense associated with the GILTI provisions of the TCJA. Beginning January 1, 2018, GILTI results in taxation of “excess of foreign earnings”, which is defined as amounts greater than a 10% rate of return on applicable foreign tangible asset basis. The Company is required to record incremental tax provision impact with respect to GILTI as a result of having historical U.S. NOL amounts to offset the GILTI taxable income inclusion. This NOL utilization precludes us from recognizing FTCs which would otherwise help offset the tax impacts of GILTI. No FTCs will be recognized with respect to GILTI until our cumulative NOL balance has been exhausted. Because the GILTI provision does not impact our cash taxes (given available U.S. NOLs), and given that we expect to recognize FTCs to offset GILTI impacts once the NOLs are exhausted, we do not view this item as a component of core operations.

⁽⁴⁾   Represents the provisional adjustment for the impact of the TCJA recorded in Net Income.

The adjustments to net loss attributable to PQ Group Holdings Inc. are shown net of applicable tax rates of 33.2% and 43.8% for the six months ended June 30, 2018 and June 30, 2017, respectively, except for the foreign currency exchange loss for which the tax is calculated as a discrete item using the applicable statutory income tax rates.

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Financial Condition, Liquidity and Capital Resources

Our primary sources of liquidity consist of cash flow from operations, existing cash balances as well as funds available under our asset based lending revolving credit facility. We expect that ongoing requirements for debt service and capital expenditures will be funded from these sources of funds. Our primary liquidity requirements include funding working capital requirements (primarily inventory and accounts receivable, net of accounts payable and other accrued liabilities), debt service requirements and capital expenditures. Our capital expenditures include both maintenance of business, which include spending on maintenance and health, safety, environmental initiatives and cost savings initiatives as well as expansion, which includes spending to drive organic sales growth. As reported for the six months ended June 30, 2018, we spent approximately $52.5 million in maintenance capital expenditures and $6.7 million in expansion capital expenditures. For the six months ended June 30, 2017, we spent approximately $36.7 million in maintenance capital expenditures and $17.5 million in expansion capital expenditures.

We believe that our existing cash, cash equivalents and cash flows from operations, combined with availability under our asset based lending revolving credit facility, will be sufficient to meet our presently anticipated future cash needs for at least the next 12 months. We may also pursue strategic acquisition opportunities, which may impact our future cash requirements. We may, from time to time, increase borrowings under our asset based lending revolving credit facility to meet our future cash needs. As of June 30, 2018, we had cash and cash equivalents of $52.6 million and availability of $143.7 million under our asset based lending revolving credit facility, after giving effect to $19.8 million of outstanding letters of credit and $32.0 million of revolving credit facility borrowings, for a total available liquidity of $196.3 million. As of June 30, 2018, we were in compliance with all covenants under our debt agreements.

Included in our cash and cash equivalents balance as of June 30, 2018 was $45.0 million of cash and cash equivalents held in foreign jurisdictions. We repatriate cash held outside of the United States from certain foreign subsidiaries in order to meet domestic liquidity needs. In certain cases, the repatriation of foreign cash under current U.S. tax laws is subject to income taxes. We have an intercompany loan structure in place with several of our foreign subsidiaries that allows us, under current U.S. tax laws, to repatriate foreign cash in a tax efficient manner from those subsidiaries. Depending on domestic and foreign cash needs, we have the flexibility to repatriate foreign cash to meet our future liquidity needs, subject to satisfaction of any applicable U.S. income taxes. Due to the enactment of the TCJA in December 2017, future overseas earnings repatriation will no longer be subject to U.S. federal income taxes at the time of cash distribution. However, future earnings may still be taxed for state income tax purposes, as well as subject to certain foreign withholding tax obligations, when cash amounts are distributed back to the U.S.

As of June 30, 2018, our total indebtedness was $2,287.7 million, with up to $143.7 million of available borrowings under our asset based lending revolving credit facility. Our liquidity requirements are significant, primarily due to debt service requirements. As reported, our cash interest expense for the six months ended June 30, 2018 and 2017 was approximately $60.2 million and $91.7 million, respectively. Before any impact of hedges, a one percent change in assumed interest rates for our variable interest credit facilities would have an annual impact of approximately $13.1 million on interest expense.

Cash Flow

	Six months ended June 30,
	2018			2017
	(in millions)
Net cash provided by (used in)
Operating activities	$	50.1		$	21.8
Investing activities	(66.3		)	(112.9		)
Financing activities	4.7			66.8
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1.8		)	(5.4		)
Net change in cash, cash equivalents and restricted cash	(13.3		)	(29.7		)
Cash, cash equivalents and restricted cash at beginning of period	67.2			85.1
Cash, cash equivalents and restricted cash at end of period	$	53.9		$	55.4

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	Six months ended June 30,
	2018			2017
	(in millions)
Net income (loss)	$	16.7		$	(3.9	)
Non-cash and non-working capital related activities(1)	119.4			104.2
Changes in working capital	(81.9		)	(76.6		)
Other operating activities	(4.1		)	(1.9		)
Net cash provided by operating activities	$	50.1		$	21.8

⁽¹⁾  Includes depreciation, amortization, changes related to purchase accounting fair value adjustments, amortization of deferred financing costs and original issue discount, debt extinguishment costs, foreign currency exchange losses, pension and postretirement healthcare benefit expense and funding, deferred income tax benefit, net losses on asset disposals, stock compensation expense, and equity in net income and dividends received from affiliated companies.

Net cash provided by operating activities was $50.1 million for the six months ended June 30, 2018, compared to $21.8 millionprovided for the six months ended June 30, 2017. Cash generated by net income (loss) plus non-cash and non-working capital related activities was higher during the six months ended June 30, 2018 by $35.8 million compared to the same period in the prior year. The change in working capital during the six months ended June 30, 2018 was unfavorable compared to the six months ended June 30, 2017. Cash used to fund working capital was $81.9 million and $76.6 million for the six months ended June 30, 2018 and 2017, respectively.

The increase in cash generated by net income (loss) plus non-cash and non-working capital related activities of $35.8 million as compared to the prior year period was primarily due to the integration of Sovitec into our existing European operations, higher North American highway safety sales, increased sales within our Zeolyst Joint Venture and higher cost pass-through pricing, which was partially offset by higher plant maintenance costs, higher compensation related costs due to increased employee headcount and increased labor inflation costs.

	Six months ended June 30,
	2018			2017
	(in millions)
Working capital changes that provided (used) cash:
Receivables	$	(54.3	)	$	(44.0	)
Inventories	(9.9		)	2.0
Prepaids and other current assets	(3.6		)	(1.4		)
Accounts payable	1.0			(7.4		)
Accrued liabilities	(15.1		)	(25.8		)
	$	(81.9	)	$	(76.6	)

The decrease in cash from working capital of $5.3 million as compared to the prior year was primarily due to unfavorable changes in accounts receivable and inventory balances, which was partially offset by favorable changes in accounts payable and accrued liabilities.

The unfavorable change in accounts receivable was due to seasonal increases in sales within our highway safety and refining services product groups. The unfavorable change in inventory was driven by inventory build in preparation for the highway safety sales season and inventory build due to planned plant maintenance in refining services. The favorable change in accounts payable was due to the timing of plant maintenance costs incurred in the prior year. The favorable change in accrued liabilities was primarily due to the timing of accrued interest under our new debt structure.

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	Six months ended June 30,
	2018			2017
	(in millions)
Purchases of property, plant and equipment	$	(66.1	)	$	(60.6	)
Investment in affiliated companies	—			(5.0		)
Loan receivable under the New Markets Tax Credit Arrangement	—			(6.2		)
Business combinations, net of cash acquired	(1.0		)	(41.6		)
Other, net	0.8			0.5
Net cash used in investing activities	$	(66.3	)	$	(112.9	)

Net cash used in investing activities was $66.3 million for the six months ended June 30, 2018, compared to cash used of $112.9 million during the same period in 2017. Cash used in investing activities primarily consisted of utilizing $66.1 million and $60.6 million to fund capital expenditures during the six months ended June 30, 2018 and 2017, respectively. The acquisitions of a cullet business in May 2018 and Sovitec in June 2017 used cash of approximately $1.0 million of and $41.6 million during the six months ended June 30, 2018 and 2017, respectively.

	Six months ended June 30,
	2018			2017
	(in millions)
Net revolver borrowings	$	9.1		$	65.0
Net cash repayments on debt obligations	(4.2		)	2.6
Other financing activities	(0.2		)	(0.8		)
Net cash provided by financing activities	$	4.7		$	66.8

Net cash provided by financing activities was $4.7 million for the six months ended June 30, 2018, compared to net cash provided of $66.8 million during the same period in 2017. The decrease in cash provided by financing activities was primarily driven by $55.9 million in lower revolver borrowings in the current year, partially offset by the net impact of the term loan refinancing (including debt issuance costs) during the six months ended June 30, 2018 as compared to long-term debt repayments for the six months ended June 30, 2017.

Debt

	June 30, 2018			December 31, 2017
	(in millions)
Term Loan Facility (U.S. dollar denominated)	$	—		$	916.2
Term Loan Facility (Euro denominated)	—			335.8
New Term Loan Facility	1,260.7			—
6.75% Senior Secured Notes due 2022	625.0			625.0
5.75% Senior Unsecured Notes due 2025	300.0			300.0
ABL Facility	32.0			25.0
Other	70.0			68.3
Total debt	2,287.7			2,270.3
Original issue discount	(21.4		)	(18.4		)
Deferred financing costs	(18.4		)	(21.4		)
Total debt, net of original issue discount and deferred financing costs	2,247.9			2,230.5
Less: current portion	(54.1		)	(45.2		)
Total long-term debt, excluding current portion	$	2,193.8		$	2,185.3

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As of June 30, 2018, our total debt was $2,287.7 million, including $18.2 million of other foreign debt and $51.8 million of notes payable for the NMTC financing and excluding the original issue discount of $21.4 million and deferred financing fees of $18.4 million for our senior secured credit facilities. Our net debt as of June 30, 2018 was $2,165.1 million, excluding $18.2 million of other foreign debt and $51.8 million of NMTC notes payable, and including cash and cash equivalents of $52.6 million. We may seek, subject to market conditions and other factors, opportunities to repurchase, refinance or otherwise reprice our debt.

Capital Expenditures

Maintenance capital expenditures include spending on maintenance of business, cost savings initiatives and health, safety and environmental initiatives. Expansion capital expenditures include spending to drive organic sales growth. These capital expenditures represent our “book” capital expenditures for which the company has recorded, but not necessarily paid for the capital expenditures.

	Six months ended June 30,
	2018		2017
	(in millions)
Maintenance capital expenditures	$	52.5	$	36.7
Expansion capital expenditures	6.7		17.5
Total capital expenditures	$	59.2	$	54.2

Capital expenditures remained at a level sufficient for required maintenance and certain expansion growth initiatives during these periods. Maintenance capital expenditures are higher in the six months ended June 30, 2018 as compared to the six months ended June 30, 2017 due to plant maintenance costs incurred at three plants in the current period as compared to two plants in the prior period. Expansion capital expenditures are higher in the six months ended June 30, 2017 due to plant expansion projects related to the Thermodrop® product line launched in 2017.

Pension Funding

We paid $4.0 million and $3.6 million in cash contributions into our defined benefit pension plans and other post-retirement plans during the six months ended June 30, 2018 and 2017, respectively. The net periodic pension expense was $0.6 million and $2.1 million for those same periods, respectively.

Off–Balance Sheet Arrangements

We had $19.8 million of outstanding letters of credit on our revolver facility as of June 30, 2018.

Contractual Obligations

Information related to our contractual obligations at December 31, 2017 can be found in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in our Annual Report on Form 10-K for the year ended December 31, 2017, filed with the SEC on March 22, 2018, which we refer to as our Annual Report on Form 10-K. During the six months ended June 30, 2018, there have been no significant changes to our contractual obligations as disclosed in our Annual Report on Form 10-K, other than as described below.

New Term Loan Facility

On February 8, 2018, we refinanced our then-existing senior secured term loan facility, which was to mature on November 2022, with a new $1,267.0 million senior secured term loan facility with a maturity date of February 2025. Annual principal payments are $12.7 million under the new senior secured term loan facility, which represents an immaterial change in our debt payment obligations under the then-existing senior secured term loan facility. Estimated interest expense (on an annualized basis), using the interest rate effective on June 30, 2018, is approximately $54.0 million on the new senior secured term loan facility through the maturity date of February 2025. Refer to Note 12 in these condensed consolidated financial statements for additional information.

Critical Accounting Policies and Estimates

We prepare our condensed consolidated financial statements in conformity with GAAP and our significant accounting policies are described in Note 2 to our audited consolidated financial statements included in our Annual Report on Form 10-K. The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect reported amounts and related disclosures. We base our estimates and judgments on historical experience and other relevant factors that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. We evaluate our critical accounting estimates, assumptions and judgments on an ongoing basis.

54

Other than changes to our critical accounting policies and estimates regarding the recognition of revenue, as described in Note 3 to our June 30, 2018 unaudited condensed consolidated financial statements, there has been no material change in our critical accounting policies and use of estimates from those described in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” included in our Annual Report on Form 10-K.

Accounting Standards Not Yet Adopted

See Note 2 to our unaudited condensed consolidated financial statements for a discussion of recently issued accounting standards and their effect on us.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

Our major market risk exposure is potential losses arising from changing rates and prices regarding foreign currency exchange rate risk, interest rate risk, commodity price risk and credit risk. The audit committee of our board of directors regularly reviews foreign exchange, interest rate and commodity hedging activity and monitors compliance with our hedging policy. We do not use financial instruments for speculative purposes, and we limit our hedging activity to the underlying economic exposure.

Other than the items noted below related to foreign exchange risk, there have been no material changes in the interest rate risk, commodity risk or credit risk discussed in Item 7A., “Quantitative and Qualitative Disclosures about Market Risk,” included in our Annual Report on Form 10-K.

Foreign Exchange Risk

Our financial results are subject to the impact of gains and losses on currency translations, which occur when the financial statements of foreign operations are translated into U.S. dollars. Because consolidated financial results are reported in U.S. dollars, sales or earnings generated in currencies other than the U.S. dollar can result in a significant increase or decrease in the amount of those sales and earnings when translated to U.S. dollars. The financial statements of our operations outside the United States, where the local currency is considered to be the functional currency, are translated into U.S. dollars using the exchange rate in effect at each balance sheet date for assets and liabilities and the average exchange rate for each period for sales, expenses, gains, losses and cash flows. The exchange rates between these currencies and the U.S. dollar in recent years have fluctuated significantly and may continue to do so in the future. The effect of translating foreign subsidiaries’ balance sheets into U.S. dollars is included in other comprehensive income. The impact of gains and losses on transactions denominated in currencies other than the functional currency of the relevant operations are included in other non-operating expense. Income and expense items are translated at average exchange rates during the year. The foreign currency loss realized in the year ended December 31, 2017 was primarily driven by the Euro-denominated term loan and the non-permanent intercompany debt denominated in local currency and translated to U.S. dollars, and was principally non-cash in nature.

On February 8, 2018, we refinanced our existing senior secured term loan facility whereby the New Term Loan Facility was used to repay the then-existing U.S. dollar denominated and Euro denominated Term Loan Facilities, thus reducing our exposure to fluctuations in the euro. Concurrent with the term loan refinancing, we entered into multiple cross currency swap arrangements to hedge foreign currency risk. The swaps are intended to enable us to effectively hedge our exposure on the net investments of certain of our euro denominated subsidiaries.

ITEM 4. CONTROLS AND PROCEDURES.

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures as of June 30, 2018, the end of the period covered by this Quarterly Report on Form 10-Q.

The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (“Exchange Act”), means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that, as of such date, our disclosure controls and procedures were effective.

Changes in Internal Control Over Financial Reporting

There was no change in the Company’s internal control over financial reporting that occurred during the quarter ended June 30, 2018 that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

55

PART II—OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS.

From time to time we may be subject to various legal claims and proceedings incidental to the normal conduct of business, relating to such matters as personal injury, product liability and warranty claims, waste disposal practices, release of chemicals into the environment and other matters that may arise in the ordinary course of our business. We currently believe that there is no litigation pending that is likely to have a material adverse effect on our business. Regardless of the outcome, legal proceedings can have an adverse impact on us because of defense and settlement costs, diversion of management resources and other factors. Refer to Note 16 of our June 30, 2018 unaudited condensed consolidated financial statements for additional information regarding the Company’s legal proceedings.

ITEM 1A. RISK FACTORS.

There has been no material change from the risk factors described in our Annual Report on Form 10-K.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS.

There were no unregistered sales of equity securities during the three months ended June 30, 2018.

56

ITEM 6. EXHIBITS.

The following exhibits are being filed or furnished as part of this Quarterly Report on Form 10-Q:

Exhibit No.	Description
31.1	Certification of Chief Executive Officer of PQ Group Holdings Inc. pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Chief Financial Officer of PQ Group Holdings Inc. pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Chief Executive Officer of PQ Group Holdings Inc. pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of Chief Financial Officer of PQ Group Holdings Inc. pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	XBRL Instance Document.
101.SCH	XBRL Taxonomy Extension Schema Document.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	XBRL Taxonomy Definition Linkbase Document.
101.LAB	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.

57

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

			PQ GROUP HOLDINGS INC.
Date:	August 10, 2018	By:	/s/ MICHAEL CREWS
			Michael Crews
			Executive Vice President and Chief Financial Officer
			(Duly Authorized Officer and Principal Financial and Accounting Officer)

58

EX-31.1

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE

SARBANES-OXLEY ACT OF 2002

I, Belgacem Chariag, certify that:

1. I have reviewed this quarterly report on Form 10-Q of PQ Group Holdings Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(c) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting. 

Date:	August 10, 2018	/s/ BELGACEM CHARIAG
		Belgacem Chariag
		President and Chief Executive Officer
		(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE

SARBANES-OXLEY ACT OF 2002

I, Michael Crews, certify that:

1. I have reviewed this quarterly report on Form 10-Q of PQ Group Holdings Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(c) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	August 10, 2018	/s/ MICHAEL CREWS
		Michael Crews
		Executive Vice President and Chief Financial Officer
		(Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the quarterly report of PQ Group Holdings Inc. (the “Company”) on Form 10-Q for the quarterly period ended June 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Belgacem Chariag, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	August 10, 2018	/s/ BELGACEM CHARIAG
		Belgacem Chariag
		President and Chief Executive Officer
		(Principal Executive Officer)

EX-32.2

Exhibit 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the quarterly report of PQ Group Holdings Inc. (the “Company”) on Form 10-Q for the quarterly period ended June 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Michael Crews, Executive Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	August 10, 2018	/s/ MICHAEL CREWS
		Michael Crews
		Executive Vice President and Chief Financial Officer
		(Principal Financial Officer)

XML

Document and Entity Information Document - shares	6 Months Ended
	Jun. 30, 2018	Aug. 06, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	PQ Group Holdings Inc.
Entity Central Index Key	0001708035
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		135,204,637

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Sales	$ 434,713	$ 389,267	$ 800,910	$ 722,198
Cost of goods sold	326,309	281,853	614,385	532,072
Gross profit	108,404	107,414	186,525	190,126
Selling, general and administrative expenses	43,477	35,358	84,095	70,070
Other operating expense, net	15,873	16,976	25,187	27,324
Operating income	49,054	55,080	77,243	92,732
Equity in net (income) from affiliated companies	(13,666)	(8,745)	(25,518)	(14,622)
Interest expense, net	27,221	48,176	56,384	94,961
Debt extinguishment costs	0	0	5,879	0
Other expense, net	5,691	14,312	10,663	16,281
Income (loss) before income taxes and noncontrolling interest	29,808	1,337	29,835	(3,888)
Provision for income taxes	13,649	3,007	13,120	97
Net income (loss)	16,159	(1,670)	16,715	(3,985)
Less: Net income (loss) attributable to the noncontrolling interest	377	(61)	719	78
Net income (loss) attributable to PQ Group Holdings Inc.	$ 15,782	$ (1,609)	$ 15,996	$ (4,063)
Net income (loss) per share:
Basic income (loss) per share (usd per share)	$ 0.12	$ (0.02)	$ 0.12	$ (0.04)
Diluted income (loss) per share (usd per share)	$ 0.12	$ (0.02)	$ 0.12	$ (0.04)
Weighted average shares outstanding:
Basic (shares)	133,222,463	104,015,815	133,188,303	103,981,851
Diluted (shares)	134,209,740	104,015,815	134,047,362	103,981,851

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 16,159	$ (1,670)	$ 16,715	$ (3,985)
Other comprehensive income (loss), net of tax:
Pension and postretirement benefits	1,375	(22)	1,357	(203)
Net gain (loss) from hedging activities	553	(1,256)	2,736	(3,025)
Foreign currency translation	(29,493)	26,305	(20,822)	41,642
Total other comprehensive income (loss)	(27,565)	25,027	(16,729)	38,414
Comprehensive income (loss)	(11,406)	23,357	(14)	34,429
Less: Comprehensive income (loss) attributable to noncontrolling interests	(1,167)	1,024	479	579
Comprehensive income (loss) attributable to PQ Group Holdings Inc.	$ (10,239)	$ 22,333	$ (493)	$ 33,850

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 52,553	$ 66,195
Receivables, net	242,014	193,456
Inventories	268,413	262,388
Prepaid and other current assets	39,036	26,929
Total current assets	602,016	548,968
Investments in affiliated companies	477,345	469,276
Property, plant and equipment, net	1,217,002	1,230,384
Goodwill	1,260,286	1,305,956
Other intangible assets, net	759,637	786,144
Other long-term assets	98,219	74,727
Total assets	4,414,505	4,415,455
LIABILITIES
Notes payable and current maturities of long-term debt	54,071	45,166
Accounts payable	139,731	149,326
Accrued liabilities	76,356	93,917
Total current liabilities	270,158	288,409
Long-term debt, excluding current portion	2,193,769	2,185,320
Deferred income taxes	197,697	189,336
Other long-term liabilities	113,553	120,471
Total liabilities	2,775,177	2,783,536
Commitments and contingencies (Note 16)
EQUITY
Common stock ($0.01 par); authorized shares 450,000,000; issued shares 135,143,229 and 135,244,379 on June 30, 2018 and December 31, 2017, respectively; outstanding shares 135,139,716 and 135,244,379 on June 30, 2018 and December 31, 2017, respectively	1,352	1,352
Preferred stock ($0.01 par); authorized shares 50,000,000; no shares issued or outstanding on June 30, 2018 and December 31, 2017	0	0
Additional paid-in capital	1,662,748	1,655,114
Accumulated deficit	(16,781)	(32,777)
Treasury stock, at cost; shares 3,513 and 0 on June 30, 2018 and December 31, 2017, respectively	(58)	0
Accumulated other comprehensive income (loss)	(12,178)	4,311
Total PQ Group Holdings Inc. equity	1,635,083	1,628,000
Noncontrolling interest	4,245	3,919
Total equity	1,639,328	1,631,919
Total liabilities and equity	$ 4,414,505	$ 4,415,455

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	450,000,000	450,000,000
Common stock, shares issued (shares)	135,143,229	135,244,379
Common stock, shares outstanding (shares)	135,139,716	135,244,379
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	50,000,000	50,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Treasury stock (shares)	3,513	0

XML

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Accumulated deficit	Treasury stock, at cost	Accumulated other comprehensive income (loss)	Non- controlling interest
Beginning balance at Dec. 31, 2016	$ 1,027,944	$ 73	$ 1,167,137	$ (90,380)	$ (239)	$ (53,711)	$ 5,064
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(3,985)			(4,063)			78
Other comprehensive income	38,414					37,913	501
Distributions to noncontrolling interests	(785)						(785)
Stock compensation expense	2,828		2,828		0
Ending balance at Jun. 30, 2017	1,064,416	73	1,169,965	(94,443)	(239)	(15,798)	4,858
Beginning balance at Dec. 31, 2017	1,631,919	1,352	1,655,114	(32,777)	0	4,311	3,919
Increase (Decrease) in Stockholders' Equity
Net income (loss)	16,715			15,996			719
Other comprehensive income	(16,729)					(16,489)	(240)
Repurchase of common shares	(58)				(58)
Distributions to noncontrolling interests	(153)						(153)
Stock compensation expense	7,627		7,627
Shares issued under equity incentive plan	7		7
Ending balance at Jun. 30, 2018	$ 1,639,328	$ 1,352	$ 1,662,748	$ (16,781)	$ (58)	$ (12,178)	$ 4,245

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income (loss)	$ 16,715	$ (3,985)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	68,865	58,030
Amortization	26,606	25,176
Acquisition accounting valuation adjustments on inventory sold	1,603	871
Amortization of deferred financing costs and original issue discount	3,079	4,348
Debt extinguishment costs	3,755	0
Foreign currency exchange loss	11,820	16,356
Pension and postretirement healthcare benefit expense	599	2,090
Pension and postretirement healthcare benefit funding	(4,040)	(3,605)
Deferred income tax provision (benefit)	3,128	(5,270)
Net loss on asset disposals	5,904	2,925
Stock compensation	7,627	2,828
Equity in net (income) from affiliated companies	(25,518)	(14,622)
Dividends received from affiliated companies	15,890	15,071
Other, net	(3,924)	(1,771)
Working capital changes that provided (used) cash, excluding the effect of business combinations:
Receivables	(54,324)	(44,046)
Inventories	(9,853)	2,015
Prepaids and other current assets	(3,612)	(1,440)
Accounts payable	960	(7,408)
Accrued liabilities	(15,142)	(25,812)
Net cash provided by operating activities	50,138	21,751
Cash flows from investing activities:
Purchases of property, plant and equipment	(66,066)	(60,613)
Investment in affiliated companies	0	(5,000)
Loan receivable under the New Markets Tax Credit Arrangement	0	(6,221)
Business combinations, net of cash acquired	(1,006)	(41,572)
Other, net	805	491
Net cash used in investing activities	(66,267)	(112,915)
Cash flows from financing activities:
Draw down of revolver	123,864	250,000
Repayments of revolver	(114,813)	(185,000)
Issuance of long-term debt	1,267,000	8,820
Debt issuance costs	(6,395)	0
Repayments of long-term debt	(1,264,791)	(6,216)
Distributions to noncontrolling interests	(153)	(785)
Repurchase of common shares	(58)	0
Net cash provided by financing activities	4,654	66,819
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,883)	(5,299)
Net change in cash, cash equivalents and restricted cash	(13,358)	(29,644)
Cash, cash equivalents and restricted cash at beginning of period	67,243	85,077
Cash, cash equivalents and restricted cash at end of period	$ 53,885	$ 55,433

XML

Background and Basis of Presentation

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Background and Basis of Presentation

1. Background and Basis of Presentation:

Description of Business

PQ Group Holdings Inc. and subsidiaries (the “Company” or “PQ Group Holdings”) conducts operations through two reporting segments: (1) Environmental Catalysts & Services (“EC&S”): a leading global innovator and producer of silica catalysts used in the production of high-density polyethylene (“HDPE”), methyl methacrylate (“MMA”), specialty zeolite-based catalysts sold to the emissions control industry, the petrochemical industry and other areas of the broader chemicals industry and a merchant sulfuric acid producer operating a network of plants serving a variety of end uses, including the oil refining, nylon, mining, general industrial and chemical industries; and (2) Performance Materials & Chemicals (“PM&C”): a fully integrated, global leader in silicate technology, producing sodium silicate, specialty silicas, zeolites, spray dry silicates, magnesium silicate, and other high performance chemical products used in a variety of end uses such as adsorbents for surface coatings, clarifying agents for beverages, cleaning and personal care products and engineered glass products for use in highway safety, polymer additives, metal finishing and electronics end uses.

Seasonal changes and weather conditions typically affect the Company’s performance materials and refining services product groups. In particular, the Company’s performance materials product group generally experiences lower sales and profit in the first and fourth quarters of the year because highway striping projects typically occur during warmer weather months. Additionally, the Company’s refining services product group typically experiences similar seasonal fluctuations as a result of higher demand for gasoline products in the summer months. As a result, working capital requirements tend to be higher in the first and fourth quarters of the year, which can adversely affect the Company’s liquidity and cash flows. Because of this seasonality associated with certain of the Company’s product groups, results for any one quarter are not necessarily indicative of the results that may be achieved for any other quarter or for the full year.

Basis of Presentation

The condensed consolidated financial statements included herein are unaudited. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) have been condensed or omitted pursuant to such rules and regulations for interim reporting. In the opinion of management, all adjustments of a normal and recurring nature necessary to state fairly the financial position and results of operations have been included. The results of operations are not necessarily indicative of the results to be expected for the full year. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. Other than the update to our accounting policies described in Note 3, the Company has continued to follow the accounting policies set forth in those consolidated financial statements.

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New Accounting Standards

6 Months Ended

Jun. 30, 2018

Accounting Changes and Error Corrections [Abstract]

New Accounting Standards

2. New Accounting Standards:

Recently Adopted Accounting Standards

In August 2017, the Financial Accounting Standards Board (“FASB”) issued amendments intended to better align hedge accounting with an entity’s risk management activities. The amendments expand hedge accounting for non-financial and financial risk components and revise the measurement methodologies to better align with an entity’s risk management activities. Separate presentation of hedge ineffectiveness is eliminated to provide greater transparency of the full impact of hedging by requiring presentation of the results of the hedged item and hedging instrument in a single financial statement line item. In addition, the amendments reduce complexity by simplifying the manner in which assessments of hedge effectiveness may be performed. The new guidance is effective for public companies for annual periods beginning after December 15, 2018, including interim periods within those years. Early adoption is permitted, and the guidance should be applied prospectively for the amended presentation and disclosure requirements, and through a cumulative-effect adjustment to beginning retained earnings for any cash flow and net investment hedges existing at the date of adoption. The Company early adopted the guidance effective January 1, 2018. The Company’s cash flow hedges in place at the date of adoption yielded an immaterial amount of ineffectiveness; therefore, the Company did not reflect an adjustment to beginning retained earnings upon adoption. The amended presentation and disclosure requirements are reflected under the new guidance in Note 13 tothese condensed consolidated financial statements.

In May 2017, the FASB issued guidance to clarify which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. Under the new guidance, an entity should account for the effects of a change in a share-based payment award using modification accounting unless the fair value, vesting conditions and classification as either a liability or equity are all the same with respect to the award immediately prior to modification and the modified award itself. The new guidance is effective for annual periods beginning after December 15, 2017, including interim periods within those years, and the new guidance should be applied prospectively to awards modified on or after the adoption date. The Company adopted the new guidance on January 1, 2018 as required, with no impact on the Company’s condensed consolidated financial statements upon adoption.

In March 2017, the FASB issued guidance to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost (collectively, “pension costs”). Under current GAAP, there are several components of pension costs which are presented net to arrive at pension costs as included in the income statement and disclosed in the notes. As part of this amendment to the existing guidance, the service cost component of pension costs will be bifurcated from the other components and included in the same line items of the income statement as compensation costs are reported. The remaining components will be reported together below operating income on the income statement, either as a separate line item or combined with another line item on the income statement and disclosed. Additionally, with respect to capitalization to inventory, fixed assets, etc., only the service cost component will be eligible for capitalization upon adoption of the guidance. The new guidance is effective for public companies for annual periods beginning after December 15, 2017, including interim periods within those years. The amendments should be applied retrospectively upon adoption with respect to the presentation of the service and other cost components of pension costs in the income statement, and prospectively for the capitalization of the service cost component in assets.

The Company adopted the new guidance on January 1, 2018 as required. Prior to the adoption of the guidance, the Company reflected its pension costs within cost of goods sold and selling, general and administrative expenses in the condensed consolidated statements of operations, depending on whether the costs were associated with employees involved in manufacturing or back office support functions. Under the new guidance, the service cost component of the Company’s pension costs remained in the same line items of the condensed consolidated statements of operations, but the remaining components are now reported as part of nonoperating income in the other (income) expense, net line item of the condensed consolidated statements of operations. Although the guidance requires retrospective application upon adoption, a practical expedient permits the Company to use the amounts disclosed in its pension and other post-retirement benefit plan note as its basis of estimation for the prior comparative periods. The Company utilized the practical expedient, and $69 and $332 of a net pension benefit for the three and six months ended June 30, 2017, respectively, was reclassified to other (income) expense, net. For the three and six months ended June 30, 2018, the amount of pension costs included in other (income) expense, net was a net benefit of $1,285 and $1,770, respectively.

In January 2017, the FASB issued guidance that clarifies the definition of a business and provides revised criteria and a framework to determine whether an integrated set of assets and activities is a business. For public companies, the new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those years. The Company adopted the new guidance on January 1, 2018 as required, with no impact on the Company’s condensed consolidated financial statements upon adoption.

In November 2016, the FASB issued guidance which clarifies the classification and presentation of changes in restricted cash on the statement of cash flows. The updates in the guidance require that the statement of cash flows explain the change during the period in the total of cash, cash equivalents and restricted cash when reconciling the beginning-of-period and end-of-period total amounts. The updates also require a reconciliation between cash, cash equivalents and restricted cash presented on the balance sheet to the total of the same amounts presented on the statement of cash flows. For public companies, the new guidance is effective for fiscal years beginning after December 15, 2017 and interim periods within those years, and the new guidance should be applied retrospectively to each period presented.

The Company adopted the new guidance on January 1, 2018 as required. As of June 30, 2018 and 2017, the Company had $1,332 and $4,976, respectively, of restricted cash included in prepaid and other current assets on its condensed consolidated balance sheets related to its New Market Tax Credit financing arrangements as well as other small restricted cash balances. Changes in the Company’s restricted cash balances prior to the adoption of the new guidance were reflected within cash flows from investing activities in the Company’s condensed consolidated statements of cash flows. The prior comparative period in the Company’s condensed consolidated statement of cash flows has been updated to conform to the new guidance. See Note 20 to these condensed consolidated financial statements for supplemental cash flow disclosures.

In August 2016, the FASB issued guidance which clarifies the classification of certain cash receipts and cash payments in the statement of cash flows, including debt prepayment or extinguishment costs and distributions from certain equity method investees. For public companies, the new guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years, and the new guidance should be applied retrospectively to each period presented. The Company adopted the new guidance on January 1, 2018 as required. There was no impact to the Company’s condensed consolidated statement of cash flows for the six months ended June 30, 2017. The Company applied the new guidance to the term loan refinancing that occurred during the six months ended June 30, 2018; see Note 12 to these condensed consolidated financial statements for further information on the debt refinancing transaction. There were no other items in the new guidance which necessitated a change in the Company’s reporting in its condensed consolidated statements of cash flows for the six months ended June 30, 2018 or 2017.

In May 2014, the FASB issued accounting guidance (with subsequent targeted amendments) to significantly enhance comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets. The core principle of the guidance is that revenue recognized from a transaction or event that arises from a contract with a customer should reflect the consideration to which an entity expects to be entitled in exchange for goods or services provided. To achieve that core principle, the new guidance sets forth a five-step revenue recognition model that will need to be applied consistently to all contracts with customers, except those that are within the scope of other topics in the Accounting Standards Codification (“ASC”). Also required are enhanced disclosures to help users of financial statements better understand the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. The enhanced disclosures include qualitative and quantitative information about contracts with customers, significant judgments made in applying the revenue guidance, and assets recognized related to the costs to obtain or fulfill a contract. For public companies, the new requirements are effective for annual reporting periods beginning after December 15, 2017, including interim periods within those years. The Company reviewed its key revenue streams and assessed the underlying customer contracts within the framework of the new guidance. The Company evaluated the key aspects of its revenue streams for impact under the new guidance and performed a detailed analysis of its customer agreements to quantify the changes under the guidance. The Company concluded that the guidance did not have a material impact on its existing revenue recognition practices upon adoption on January 1, 2018. The Company implemented the guidance under the modified retrospective transition method of adoption. Comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. The impact of adoption of the new revenue recognition guidance was immaterial for the six months ended June 30, 2018, and there was no transition adjustment required upon adoption. See Note 3 to these condensed consolidated financial statements for additional disclosures required by the new guidance.

Accounting Standards Not Yet Adopted

In June 2018, the FASB issued guidance which conforms the accounting for the issuance of all share-based payments using the same accounting model. Previously, the accounting for share-based payments to non-employees was covered under a different framework than those made to employees. Under the new guidance, awards to both employees and non-employees will essentially follow the same model, with small variations related to determining the term assumption when valuing a non-employee award as well as a different expense attribution model for non-employee awards. The new guidance is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. The Company is currently evaluating the effect that the new guidance would have on its consolidated financial statements.

In February 2018, the FASB issued guidance which will permit entities to make an election to reclassify income tax effects stranded in accumulated other comprehensive income (“AOCI”) to retained earnings as a result of tax reform legislation enacted by the U.S. government on December 22, 2017. The standard is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, with early adoption permitted in any interim period for which the financial statements have not yet been issued. Prior to the enactment of the tax reform legislation on December 22, 2017, the Company had amounts recorded in AOCI related to its domestic pension, postretirement and supplementary benefit plans and cash flow hedging relationships that were based on pre-enactment tax rates. The Company is evaluating the impact that the new guidance will have on its consolidated financial statements. If the Company makes the election to reclassify the stranded income tax effects from AOCI, it may do so using one of two transition methods: restrospectively, or at the beginning of the period of adoption.

In January 2017, the FASB issued guidance which eliminates the second step from the traditional two-step goodwill impairment test. Under current guidance, an entity performed the first step of the goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount; if an impairment loss was indicated, the entity computed the implied fair value of goodwill to determine whether an impairment loss existed, and if so, the amount to recognize. Under the new guidance, an impairment loss is recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value (the Step 1 test), with no further testing required. Any impairment loss recognized is limited to the amount of goodwill allocated to the reporting unit. The new guidance is effective for public companies that are Securities and Exchange Commission (“SEC”) registrants for fiscal years beginning after December 15, 2019, with early adoption permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The Company will apply the guidance prospectively to goodwill impairment tests subsequent to the adoption date.

In June 2016, the FASB issued guidance that affects loans, trade receivables and any other financial assets that have the contractual right to receive cash. Under the new guidance, an entity is required to recognize expected credit losses rather than incurred losses for financial assets. The new guidance is effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. The Company believes that the new guidance will not have a material impact on its consolidated financial statements.

In February 2016, the FASB issued guidance (with subsequent targeted amendments) that modifies the accounting for leases. Under the new guidance, a lessee will recognize assets and liabilities for most leases (including those classified under existing GAAP as operating leases, which based on current standards are not reflected on the balance sheet), but will recognize expenses similar to current lease accounting. For public companies, the new guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those years. Early adoption is permitted. The new guidance must be adopted using either a (1) modified retrospective transition method, in which all periods presented in the financial statements reflect the impact of the new guidance, or (2) prospective method at the date of adoption, with a cumulative-effect adjustment to the opening balance of retained earnings. The Company has operating lease agreements for which it expects to recognize right of use assets and corresponding liabilities on its balance sheet upon adoption of the new guidance. The Company has prepared a detailed plan to implement the new guidance, gathered the information related to its current lease population, and is assessing its leases in the context of the new framework. The Company is working with a vendor to implement a lease management system which will assist in delivering the required accounting changes. The Company is currently evaluating the impact that the new guidance will have on its consolidated financial statements, business processes, systems and control environment. The Company does not plan to implement the guidance prior to the required adoption date of January 1, 2019, and the Company plans to use the prospective method at the date of adoption.

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Revenue from Contracts with Customers

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer

3. Revenue from Contracts with Customers:

Revenue Recognition Model

In determining the appropriate amount of revenue to be recognized as the Company fulfills its obligations under its agreements, the Company performs the following steps: (i) identification of the contract with the customer; (ii) determination of whether the promised goods or services are performance obligations, including whether they are distinct in the context of the contract; (iii) measurement of the transaction price; (iv) allocation of the transaction price to the performance obligations based on estimated selling prices; and (v) recognition of revenue when (or as) the Company satisfies each performance obligation.

The Company identifies a contract when an agreement with a customer creates legally enforceable rights and obligations, which occurs when a contract has been approved by both parties, the parties are committed to perform their respective obligations, each party’s rights and payment terms are clearly identified, commercial substance exists and it is probable that the Company will collect the consideration to which it is entitled. The Company and its customers typically enter into master service agreements (“MSA”), which establish the terms, including prices, under which orders to purchase goods may be placed. In these instances, the Company’s contract with a customer is the purchase order issued under the MSA. Certain of the Company’s MSAs contain provisions regarding the purchase of a minimum quantity of goods. Under these circumstances, the Company considers the MSA to be a legally enforceable contract.

The Company identifies a performance obligation in a contract for each promised good that is separately identifiable from other promises in the contract and for which the customer can benefit from the good. The majority of the Company’s contracts have a single performance obligation, which is the promise to transfer individual goods to the customer. The Company has certain contracts that include multiple performance obligations under which the purchase price for each distinct performance obligation is defined in the contract. These distinct performance obligations may include stand-ready provisions, which are arrangements to provide a customer assurance that they will have access to output from the Company’s manufacturing facilities, or monthly reservations of capacity fees. The Company considers stand-ready provisions and reservation of capacity fees to be performance obligations satisfied over time. Revenues related to stand-ready provisions and reservation of capacity fees are recognized throughout the contract term.

As described above, the Company’s MSAs with its customers outline prices for individual products or contract provisions. MSAs in the Company’s performance chemicals and refining services product groups may contain provisions whereby raw materials costs are passed-through to the customer per the terms of their contract. The Company’s exposure to fluctuations in raw materials prices is limited, as the majority of pass-through contract provisions reset based on fluctuations in the underlying raw material price. MSAs in the Company’s refining services product group also contain take-or-pay arrangements, whereby the customer would incur a penalty in the form of a shortfall volume fee. Currently there is no history in which customers fail to meet the contractual minimum. Revenue from product sales are recorded at the net sales price, which includes estimates of variable consideration for which reserves are established and which result from discounts, returns or other allowances that are offered within contracts between the Company and its customers.

The Company recognizes revenues when performance obligations under the terms of a contract with its customer are satisfied, which generally occurs at a point in time by transferring control of a product to the customer. The Company determines the point in time when a customer obtains control of a product and the Company satisfies the performance obligation by considering factors including when the Company has a right to payment for the product, the customer has legal title to the product, the Company has transferred possession of the product, the customer has assumed the risks and rewards of ownership of the product and the customer has accepted the product. Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring goods. The Company does not have any significant payment terms as payment is received at, or shortly after, the point of sale.

Contract Assets and Liabilities

A contract asset is a right to consideration in exchange for goods that the Company has transferred to a customer when that right is conditional on something other than the passage of time. A contract liability exists when the Company receives consideration in advance of performance obligations. Other than trade accounts receivable and customer return accruals, the Company has not recorded any additional contract assets or contract liabilities on its condensed consolidated balance sheets as of June 30, 2018.

Practical Expedients and Accounting Policy Elections

The Company has elected to use certain practical expedients and has made certain accounting policy elections as permitted under the new revenue recognition guidance. Certain of the Company’s contracts with customers are based on an individual purchase order; thus, the duration of these contracts are for one year or less. The Company has made an accounting policy election to omit certain disclosures related to remaining performance obligations for contracts which have an initial term of one year or less.

When the Company performs shipping and handling activities after the transfer of control to the customer (e.g. when control transfers prior to delivery), they are considered fulfillment activities as opposed to separate performance obligations, and the Company recognizes revenue upon the transfer of control to the customer. Accordingly, the costs associated with these shipping and handling activities are accrued when the related revenue is recognized under the Company’s policy election. The Company expenses incremental costs of obtaining a contract as incurred if the expected amortization period of the asset that the Company would have recognized is one year or less. Sales, value added and other taxes the Company collects concurrent with revenue producing activities are excluded from revenues.

Disaggregated Revenue

The Company’s primary means of disaggregating revenues is by product group, which can be found in Note 17 to these condensed consolidated financial statements.

The Company’s portfolio of products are integrated into a variety of end uses, which are described in the table below.

Key End Uses	Key Products
Industrial & process chemicals	• Silicate precursors for the tire industry
	• Glass beads, or microspheres, for metal finishing end uses
Fuels & emission control	• Refinery catalysts
	• Emission control catalysts
	• Catalyst recycling services
	• Silicate for catalyst manufacturing
Packaging & engineered plastics	• Catalysts for high-density polyethlene and chemicals syntheses
	• Antiblocks for film packaging
	• Solid and hollow microspheres for composite plastics
	• Sulfur derivatives for nylon production
Highway safety & construction	• Reflective markings for roadways and airports
	• Silica gels for surface coatings
Consumer products	• Silica gels for edible oil and beer clarification
	• Precipitated silicas, silicates and zeolites for the dentifrice and
	dishwasher and laundry detergent applications
Natural resources	• Silicates for drilling muds
	• Hollow glass beads, or microspheres, for oil well cements
	• Silicates and alum for water treatment mining
	• Bleaching aids for paper

The following tables disaggregate the Company’s sales, by segment and end use, for the three and six months months ended June 30, 2018:

	Three months ended June 30, 2018
	Environmental Catalysts & Services			Performance Materials & Chemicals		Total
Industrial & process chemicals	$	17,335		$	75,811	$	93,146
Fuels & emission control (1)	60,212			—		60,212
Packaging & engineered plastics	33,919			33,966		67,885
Highway safety & construction (1)	—			110,746		110,746
Consumer products	—			65,388		65,388
Natural resources	17,952			20,250		38,202
Total	129,418			306,161		435,579
Inter-segment sales eliminations	(866		)	—		(866		)
Total segment sales	$	128,552		$	306,161	$	434,713

	Six months ended June 30, 2018
	Environmental Catalysts & Services			Performance Materials & Chemicals		Total
Industrial & process chemicals	$	34,374		$	151,082	$	185,456
Fuels & emission control (1)	116,209			—		116,209
Packaging & engineered plastics	62,162			65,774		127,936
Highway safety & construction (1)	—			157,891		157,891
Consumer products	—			142,118		142,118
Natural resources	33,860			39,118		72,978
Total	246,605			555,983		802,588
Inter-segment sales eliminations	(1,678		)	—		(1,678		)
Total segment sales	$	244,927		$	555,983	$	800,910

⁽¹⁾ As described in Note 1, the Company experiences seasonal sales fluctuations to customers in the fuels & emission control and highway safety & construction end uses.

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Fair Value Measurements

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

4. Fair Value Measurements:

Fair values are based on quoted market prices when available. When market prices are not available, fair values are generally estimated using discounted cash flow analyses, incorporating current market inputs for similar financial instruments with comparable terms and credit quality. In instances where there is little or no market activity for the same or similar instruments, the Company estimates fair values using methods, models and assumptions that management believes a hypothetical market participant would use to determine a current transaction price. These valuation techniques involve some level of management estimation and judgment that becomes significant with increasingly complex instruments or pricing models. Where appropriate, adjustments are included to reflect the risk inherent in a particular methodology, model or input used.

The Company’s financial assets and liabilities carried at fair value have been classified based upon a fair value hierarchy. The hierarchy gives the highest ranking to fair values determined using unadjusted quoted prices in active markets for identical assets and liabilities (Level 1) and the lowest ranking to fair values determined using methodologies and models with unobservable inputs (Level 3). The classification of an asset or a liability is based on the lowest level input that is significant to its measurement. For example, a Level 3 fair value measurement may include inputs that are both observable (Levels 1 and 2) and unobservable (Level 3). The levels of the fair value hierarchy are as follows:

• Level 1—Values are unadjusted quoted prices for identical assets and liabilities in active markets accessible at the measurement date. Active markets provide pricing data for trades occurring at least weekly and include exchanges and dealer markets.

• Level 2—Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices from those willing to trade in markets that are not active, or other inputs that are observable or can be corroborated by market data for the term of the instrument. Such inputs include market interest rates and volatilities, spreads and yield curves.

• Level 3—Certain inputs are unobservable (supported by little or no market activity) and significant to the fair value measurement. Unobservable inputs reflect the Company’s best estimate of what hypothetical market participants would use to determine a transaction price for the asset or liability at the reporting date.

The following table presents information about the Company’s assets and liabilities that were measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017, and indicates the fair value hierarchy of the valuation techniques the Company utilized to determine such fair value.

	June 30, 2018		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Derivative contracts	$	12,010	$	—	$	12,010	$	—
Restoration plan assets	4,962		4,962		—		—
Total	$	16,972	$	4,962	$	12,010	$	—
Liabilities:
Derivative contracts	$	196	$	—	$	196	$	—
Total	$	196	$	—	$	196	$	—

	December 31, 2017		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Derivative contracts	$	1,043	$	—	$	1,043	$	—
Restoration plan assets	5,576		5,576		—		—
Total	$	6,619	$	5,576	$	1,043	$	—
Liabilities:
Derivative contracts	$	448	$	—	$	448	$	—
Total	$	448	$	—	$	448	$	—

Restoration plan assets

The fair values of the Company’s restoration plan assets are determined through quoted prices in active markets. Restoration plan assets are assets held in a Rabbi trust to fund the obligations of the Company’s defined benefit supplementary retirement plans and include various stock and fixed income mutual funds. See Note 15 to these condensed consolidated financial statements regarding defined supplementary retirement plans. Unrealized gains and losses associated with the underlying stock and fixed income mutual funds were immaterial as of June 30, 2018 and December 31, 2017, respectively.

Derivative contracts

Derivative assets and liabilities can be exchange-traded or traded over-the-counter (“OTC”). The Company generally values exchange-traded derivatives using models that calibrate to market transactions and eliminate timing differences between the closing price of the exchange-traded derivatives and their underlying instruments. OTC derivatives are valued using market transactions and other market evidence whenever possible, including market-based inputs to models, model calibration to market transactions, broker or dealer quotations or alternative pricing sources with reasonable levels of price transparency. When models are used, the selection of a particular model to value an OTC derivative depends on the contractual terms of, and specific risks inherent in, the instrument as well as the availability of pricing information in the market. The Company generally uses similar models to value similar instruments. Valuation models require a variety of inputs, including contractual terms, market prices and rates, forward curves, measures of volatility, and correlations of such inputs. For OTC derivatives that trade in liquid markets, such as forward contracts, swaps and options, model inputs can generally be corroborated by observable market data by correlation or other means, and model selection does not involve significant management judgment.

The Company has interest rate caps, natural gas swaps and cross currency swaps that are fair valued using Level 2 inputs. In addition, the Company applies a credit valuation adjustment to reflect credit risk which is calculated based on credit default swaps. To the extent that the Company’s net exposure under a specific master agreement is an asset, the Company utilizes the counterparty’s default swap rate. If the net exposure under a specific master agreement is a liability, the Company utilizes a default swap rate comparable to PQ Group Holdings. The credit valuation adjustment is added to the discounted fair value to reflect the exit price that a market participant would be willing to receive to assume the Company’s liabilities or that a market participant would be willing to pay for the Company’s assets. As of June 30, 2018 and December 31, 2017, the credit valuation adjustment resulted in a minimal change in the fair value of the derivatives.

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Accumulated Other Comprehensive Income

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Accumulated Other Comprehensive Income

5. Accumulated Other Comprehensive Income:

The following tables present the tax effects of each component of other comprehensive income (loss) for the three and six months ended June 30, 2018 and 2017:

	Three months ended June 30,
	2018									2017
	Pre-tax amount			Tax benefit/(expense)			After-tax amount			Pre-tax amount			Tax benefit/(expense)			After-tax amount
Defined benefit and other postretirement plans:
Amortization and unrealized losses	$	1,833		$	(458	)	$	1,375		$	(34	)	$	12		$	(22	)
Benefit plans, net	1,833			(458		)	1,375			(34		)	12			(22		)
Net gain (loss) from hedging activities	737			(184		)	553			(2,025		)	769			(1,256		)
Foreign currency translation	(29,947		)	454			(29,493		)	30,612			(4,307		)	26,305
Other comprehensive income (loss)	$	(27,377	)	$	(188	)	$	(27,565	)	$	28,553		$	(3,526	)	$	25,027
	Six months ended June 30,
	2018									2017
	Pre-tax amount			Tax benefit/(expense)			After-tax amount			Pre-tax amount			Tax benefit/(expense)			After-tax amount
Defined benefit and other postretirement plans:
Amortization and unrealized losses	$	1,809		$	(452	)	$	1,357		$	(228	)	$	25		$	(203	)
Benefit plans, net	1,809			(452		)	1,357			(228		)	25			(203		)
Net gain (loss) from hedging activities	3,649			(913		)	2,736			(4,887		)	1,862			(3,025		)
Foreign currency translation	(19,833		)	(989		)	(20,822		)	47,859			(6,217		)	41,642
Other comprehensive income (loss)	$	(14,375	)	$	(2,354	)	$	(16,729	)	$	42,744		$	(4,330	)	$	38,414

The following table presents the change in accumulated other comprehensive income, net of tax, by component for the six months ended June 30, 2018 and 2017:

	Defined benefit and other postretirement plans			Net gain (loss) from hedging activities			Foreign currency translation			Total
December 31, 2017	$	7,412		$	967		$	(4,068	)	$	4,311
Other comprehensive income (loss) before reclassifications	1,387			2,613			(20,582		)	(16,582		)
Amounts reclassified from accumulated other comprehensive income(1)	(30		)	123			—			93
Net current period other comprehensive income (loss)	1,357			2,736			(20,582		)	(16,489		)
June 30, 2018	$	8,769		$	3,703		$	(24,650	)	$	(12,178	)
December 31, 2016	$	7,513		$	4,557		$	(65,781	)	$	(53,711	)
Other comprehensive income (loss) before reclassifications	(137		)	(3,038		)	41,141			37,966
Amounts reclassified from accumulated other comprehensive income(1)	(66		)	13			—			(53		)
Net current period other comprehensive income (loss)	(203		)	(3,025		)	41,141			37,913
June 30, 2017	$	7,310		$	1,532		$	(24,640	)	$	(15,798	)

⁽¹⁾  See the following table for details about these reclassifications. Amounts in parentheses indicate debits.

The following table presents the reclassifications out of accumulated other comprehensive income for the three and six months ended June 30, 2018 and 2017.

Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income(a)												Affected Line Item in the Statements of Operations
	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Defined benefit and other postretirement plans
Amortization of prior service credit	$	(20	)	$	(20	)	$	(39	)	$	(39	)	(b)
Amortization of net (gain) loss	1			(19		)	3			(38		)	(b)
	(19		)	(39		)	(36		)	(77		)	Total before tax
	3			6			6			11			Tax expense (benefit)
	$	(16	)	$	(33	)	$	(30	)	$	(66	)	Net of tax
Net (gain) loss from hedging activities
Interest rate caps	$	58		$	9		$	93		$	11		Interest expense
Natural gas swaps	99			28			71			10			Cost of goods sold
	157			37			164			21			Total before tax
	(39		)	(8		)	(41		)	(8		)	Tax expense (benefit)
	$	118		$	29		$	123		$	13		Net of tax
Total reclassifications for the period	$	102		$	(4	)	$	93		$	(53	)	Net of tax

^(a)  Amounts in parentheses indicate credits to profit/loss.

^(b)  These accumulated other comprehensive income (loss) components are included in the computation of net periodic pension and other postretirement cost (see Note 15 to these condensed consolidated financial statements for additional details).

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Acquisitions

6 Months Ended

Jun. 30, 2018

Business Combinations [Abstract]

Acquisition

6. Acquisition:

Acquisitions are accounted for using the acquisition method of accounting. Under the acquisition method, the purchase price is allocated to the identifiable net assets acquired based on the fair values of the identifiable assets acquired and liabilities assumed as of the acquisition date. The excess of the purchase price over the fair values of the identifiable net assets acquired is recorded as goodwill.

On June 12, 2017 (the “Acquisition Date”), the Company acquired the facilities of Sovitec Mondial S.A. (“Sovitec”) located in Belgium, Spain, Argentina and France as part of a stock transaction (the “Acquisition”) for $41,572 in cash, excluding assumed debt. Based in Fleurus, Belgium, Sovitec is a high quality producer of engineered glass products used in transportation safety, metal finishing and polymer additives. The results of operations of Sovitec have been included in the Company’s consolidated financial statements since the Acquisition Date.

The following table sets forth the calculation and allocation of the purchase price to the identifiable net assets acquired with respect to the Acquisition, which was complete as of March 31, 2018.

	Provisional Purchase Price Allocation			Adjustments			Purchase Price Allocation
Total consideration, net of cash acquired	$	41,572		$	—		$	41,572
Recognized amounts of identifiable assets acquired and liabilities assumed:
Receivables	$	14,305		$	—		$	14,305
Inventories	7,645			1,603			9,248
Prepaid and other current assets	400			—			400
Property, plant and equipment	9,020			15,960			24,980
Other intangible assets	—			5,753			5,753
Other long-term assets	129			15,921			16,050
Fair value of assets acquired	31,499			39,237			70,736
Current debt	(6,420		)	—			(6,420		)
Accounts payable	(10,748		)	—			(10,748		)
Long-term debt	(10,189		)	—			(10,189		)
Deferred income taxes	—			(4,426		)	(4,426		)
Other long-term liabilities	(154		)	—			(154		)
Fair value of net assets acquired	3,988			34,811			38,799
Goodwill	37,584			(34,811		)	2,773
	$	41,572		$	—		$	41,572

As of the Acquisition Date, the fair value of accounts receivable approximated historical cost. The gross contractual amount of accounts receivable at the Acquisition Date was $14,607, of which $302 was deemed uncollectible. The fair value of inventory is defined as estimated selling prices less the sum of (a) costs of disposal and (b) a reasonable profit allowance for the selling effort of the acquiring entity, which was $1,603 higher than the historical cost.

The Company’s cost of goods sold for the six months ended June 30, 2018 includes a pre-tax charge of $1,603 relating to the step-up on inventory, $108 of additional amortization expense related to identified intangible assets and $421 of additional depreciation expense, which would have been recorded during the year ended December 31, 2017 if the adjustments to the provisional amounts had been recognized as of the Acquisition Date. The Company’s other expense, net for the six months ended June 30, 2018 includes additional amortization expense related to identified intangible assets of $101 which would have been recorded during the year ended December 31, 2017 if the adjustments to the provisional amounts had been recognized as of the Acquisition Date. The Company’s provision for income taxes for the six months ended June 30, 2018 includes an additional $990 tax benefit associated with the year ended December 31, 2017, to reflect impacts as if the adjustments to the provisional amounts had been recognized as of the Acquisition Date. This amount is primarily a result of opening balance sheet adjustments recorded during the six months ended June 30, 2018, which needed to be re-measured through the income statement because of income tax rate changes that occurred subsequent to the Acquisition Date.

The Company believes that the Acquisition will enable it to offer a more comprehensive, cost-effective and high-quality portfolio of products and services to its customers worldwide when, combined with anticipated synergies within its existing business, contributed to a total purchase price that resulted in the recognition of goodwill. All of the goodwill was assigned to the Company’s PM&C reporting segment. The goodwill associated with the Acquisition is not deductible for tax purposes.

The valuation of the intangible assets acquired and the related weighted-average amortization periods are as follows:

	Amount		Weighted-Average Expected Useful Life (in years)
Intangible assets subject to amortization:
Trademarks	$	1,767	11
Technical know-how	1,892		11
Total intangible assets subject to amortization	3,659
Trade names, not subject to amortization	2,094		Indefinite
Total	$	5,753

Net sales and net income generated by the Sovitec legal entities included in the Company’s condensed consolidated statements of operations are as follows:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Net sales	$	19,326	$	3,704	$	30,247	$	3,704
Net income	2,585		503		814		503

Acquisition costs were immaterial for the three and six months ended June 30, 2018 and were $454 and $1,328 for the three and six months ended June 30, 2017, respectively. Acquisition costs are included in other operating expense, net in the Company’s condensed consolidated statements of operations.

Pro Forma Financial Information

The unaudited pro forma financial information for the three and six months ended June 30, 2017 has been derived from the Company’s historical consolidated financial statements and prepared to give effect to the Acquisition, assuming that the Acquisition occurred on January 1, 2016. The unaudited pro forma consolidated results of operations are provided for illustrative purposes only and are not indicative of the Company’s actual consolidated results of operations had the Acquisition been made as of January 1, 2016. The unaudited pro forma results of operations do not reflect any operating efficiencies or potential cost savings which may result from the Acquisition.

	Unaudited
	Three months ended June 30, 2017			Six months ended June 30, 2017
Pro forma sales	$	397,251		$	738,625
Pro forma net loss	(2,629		)	(4,162		)
Pro forma net loss attributable to PQ Group Holdings Inc.	(2,568		)	(4,240		)
Pro forma basic and diluted net loss per share	$	(0.02	)	$	(0.04	)

The results of operations for the three and six months ended June 30, 2018 include the operating results of the combined company for the full period and therefore, there is no pro forma presentation included in the table above.

Certain non-recurring charges included in the Company’s results of operations for the three and six months ended June 30, 2017 were allocated to the respective prior year periods for pro forma purposes. For the three months ended June 30, 2017, non-recurring charges allocated to the prior year period include transaction fee charges of $454 which were excluded from pro forma net loss. Also included in pro forma net loss for the three months ended June 30, 2017 is amortization expense of $90 and depreciation expense of $149 associated with the fair value step-up of identifiable intangible assets and property, plant and equipment, respectively. For the six months ended June 30, 2017, non-recurring charges allocated to the prior year period include transaction fee charges of $1,328 which were excluded from pro forma net loss. Also included in pro forma net loss for the six months ended June 30, 2017 is amortization expense of $176 and depreciation expense of $353 associated with the fair value step-up of identifiable intangible assets and property, plant and equipment, respectively.

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Goodwill

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

7. Goodwill:

The changes in the carrying amount of goodwill for the six months ended June 30, 2018 is summarized as follows:

	Performance Materials & Chemicals			Environmental Catalysts & Services			Total
Balance as of December 31, 2017	$	914,623		$	391,333		$	1,305,956
Goodwill recognized	629			—			629
Goodwill adjustments(1)	(34,811		)	—			(34,811		)
Foreign exchange impact	(10,851		)	(637		)	(11,488		)
Balance as of June 30, 2018	$	869,590		$	390,696		$	1,260,286

⁽¹⁾  Represents the measurement period adjustments on the net assets acquired as part of the Acquisition (see Note 6 to these condensed consolidated financial statements for further information regarding the Acquisition).

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Other Operating Expense, Net

6 Months Ended

Jun. 30, 2018

Other Income and Expenses [Abstract]

Other Operating Expense, Net

8. Other Operating Expense, Net:

A summary of other operating expense, net is as follows:

	Three months ended June 30,					Six months ended June 30,
	2018			2017		2018			2017
Amortization expense	$	8,744		$	8,290	$	17,693		$	14,124
Transaction and other related costs(1)	190			2,954		612			4,329
Restructuring and other related costs (Note 18)	10			276		130			1,472
Net loss on asset disposals(2)	4,752			2,577		5,904			2,925
Management advisory fees	—			1,250		—			2,500
Insurance proceeds(2)	(313		)	—		(1,557		)	—
Other, net	2,490			1,629		2,405			1,974
	$	15,873		$	16,976	$	25,187		$	27,324

⁽¹⁾  Transaction and other related costs for the three and six months ended June 30, 2018 and 2017 primarily include transaction costs associated with the Company’s initial public offering (exclusive of the direct costs recorded in stockholders’ equity net of the proceeds from the offering) and the Acquisition (see Note 6 to these condensed consolidated financial statements for further information).

⁽²⁾  During the three and six months ended June 30, 2018, the Company recognized $1,000 and $2,500, respectively, of insurance proceeds in its condensed consolidated statement of operations related to the Company’s claim for losses sustained during Hurricane Harvey in August 2017. For the three months ended June 30, 2018, $264 was recorded as a gain in other operating expense, net, as reimbursement of expenses, while the remaining $736 represented proceeds in excess of the Company’s property losses which was recorded as a non-operating gain in other expense, net, in the Company’s consolidated statement of operations. For the six months endedJune 30, 2018, $1,557 was recorded as a gain in other operating expense, net, as reimbursement of expenses, $207 was recorded as a gain in net loss on asset disposals within other operating expense, net, for the Company’s previously recognized property losses, and $736 represented proceeds in excess of the Company’s property losses which was recorded as a non-operating gain in other expense, net, in the Company’s consolidated statement of operations.

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Inventories

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Inventories

9. Inventories:

Inventories are classified and valued as follows:

	June 30, 2018		December 31, 2017
Finished products and work in process	$	203,701	$	199,919
Raw materials	64,712		62,469
	$	268,413	$	262,388
Valued at lower of cost or market:
LIFO basis	$	168,256	$	162,315
Valued at lower of cost and net realizable value:
FIFO or average cost basis	100,157		100,073
	$	268,413	$	262,388

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Investments in Affiliated Companies

6 Months Ended

Jun. 30, 2018

Equity Method Investments and Joint Ventures [Abstract]

Investments in Affiliated Companies

10. Investments in Affiliated Companies:

The Company accounts for investments in affiliated companies under the equity method. Affiliated companies accounted for on the equity basis as of June 30, 2018 are as follows:

Company	Country	Percent Ownership
PQ Silicates Ltd.	Taiwan	50%
Zeolyst International	USA	50%
Zeolyst C.V.	Netherlands	50%
Quaker Holdings	South Africa	49%

Following is summarized information of the combined investments⁽¹⁾:    

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Net sales	$	108,898	$	68,732	$	197,474	$	141,787
Gross profit	40,669		29,661		76,191		58,586
Operating income	31,622		19,112		57,663		37,695
Net income	30,638		20,809		57,660		39,844

⁽¹⁾  Summarized information of the combined investments is presented at 100%; the Company’s share of the net assets and net income of affiliates is calculated based on the percent ownership specified in the table above.

The Company’s investments in affiliated companies balance as of June 30, 2018 and December 31, 2017 includes net purchase accounting fair value adjustments of $261,384 and $264,700, respectively, related to the combination of the businesses of PQ Holdings Inc. and Eco Services Operations LLC in May 2016, consisting primarily of goodwill and intangible assets such as customer relationships, technical know-how and trade names. Consolidated equity in net income from affiliates is net of $1,658 and $3,316 of amortization expense related to purchase accounting fair value adjustments for the three and six months ended June 30, 2018, respectively. Consolidated equity in net income from affiliates is net of $1,658 and $5,282 of amortization expense related to purchase accounting fair value adjustments for the three and six months ended June 30, 2017.

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Property, Plant and Equipment

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

11. Property, Plant and Equipment:

A summary of property, plant and equipment, at cost, and related accumulated depreciation is as follows:

	June 30, 2018			December 31, 2017
Land	$	192,017		$	191,006
Buildings	209,672			200,054
Machinery and equipment	1,063,438			1,005,025
Construction in progress	121,157			145,414
	1,586,284			1,541,499
Less: accumulated depreciation	(369,282		)	(311,115		)
	$	1,217,002		$	1,230,384

Depreciation expense was $33,962 and $29,841 for the three months ended June 30, 2018 and 2017, respectively. Depreciation expense was $68,865 and $58,030 for the six months ended June 30, 2018 and 2017, respectively.

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Long-term Debt

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Long-term Debt

12. Long-term Debt:

The summary of long-term debt is as follows:

	June 30, 2018			December 31, 2017
Term Loan Facility (U.S. dollar denominated)	$	—		$	916,153
Term Loan Facility (Euro denominated)	—			335,808
New Term Loan Facility	1,260,665			—
6.75% Senior Secured Notes due 2022	625,000			625,000
5.75% Senior Unsecured Notes due 2025	300,000			300,000
ABL Facility	32,000			25,000
Other	69,990			68,318
Total debt	2,287,655			2,270,279
Original issue discount	(21,409		)	(18,390		)
Deferred financing costs	(18,406		)	(21,403		)
Total debt, net of original issue discount and deferred financing costs	2,247,840			2,230,486
Less: current portion	(54,071		)	(45,166		)
Total long-term debt, excluding current portion	$	2,193,769		$	2,185,320

The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction. As of June 30, 2018 and December 31, 2017, the fair value of the senior secured term loans and senior secured and unsecured notes was higher than book value by $16,496 and $59,319, respectively. The fair value of the senior secured term loans and senior secured and unsecured notes was derived from published loan prices as of June 30, 2018 and December 31, 2017, as applicable. The fair value is classified as Level 2 based upon the fair value hierarchy (see Note 4 to these condensed consolidated financial statements for further information on fair value measurements).

New Term Loan Facility

On February 8, 2018 (the “Closing Date”), PQ Corporation (the “Borrower”), an indirect, wholly owned subsidiary of the Company, refinanced its existing senior secured term loan facility with a new $1,267,000 senior secured term loan facility (the “New Term Loan Facility”) by entering into a third amendment agreement (the “Amendment”), which amended and restated the Term Loan Credit Agreement dated as of May 4, 2016, among the Borrower, CPQ Midco I Corporation, Credit Suisse AG, Cayman Island Branch, as administrative agent and collateral agent, and the lenders and the other parties party thereto from time to time (as amended prior to the Amendment, the “Existing Credit Agreement” and as amended and restated by the Amendment, the “New Credit Agreement”).

The New Term Loan Facility bears interest at a floating rate of LIBOR plus 2.50% per annum and matures in February 2025, effectively lowering the interest rate margin, eliminating the interest rate floor that existed on the Euro-denominated tranche prior to refinancing, and extending the maturity of its senior secured term loan facility. The New Term Loan Facility requires scheduled quarterly amortization payments, each equal to 0.25% of the original principal amount of the loans under the New Term Loan Facility. Voluntary prepayments of the New Term Loan Facility in connection with a Repricing Transaction, as defined in the New Credit Agreement, on or prior to six months after the Closing Date will be subject to a call premium of 1.00%. Otherwise, outstanding loans under the New Term Loan Facility may be voluntarily prepaid at any time without premium or penalty. In addition, the New Credit Agreement contains customary mandatory prepayments, affirmative and negative covenants and events of default, all of which are substantially the same as under the Existing Credit Agreement.

The Company recorded $2,124 of new creditor and third-party financing costs as debt extinguishment costs. In addition, previous unamortized deferred financing costs of $1,403 and original issue discount of $2,352 associated with the previously outstanding debt were written off as debt extinguishment costs.

On the Closing Date, the Company also entered into multiple cross currency swap arrangements to hedge foreign currency risk. The swaps are designed to enable the Company to effectively convert a portion of its fixed-rate U.S. dollar denominated debt obligations into approximately €280,000 equivalent ($327,102 as of June 30, 2018). The swaps are expected to mature in February 2023.

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Financial Instruments

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial Instruments

13. Financial Instruments:

The Company uses (1) interest rate related derivative instruments to manage its exposure to changes in interest rates on its variable-rate debt instruments, (2) commodity derivatives to manage its exposure to commodity price fluctuations, and (3) foreign currency related derivative instruments to manage its foreign currency exposure to its net investments in certain foreign operations. The Company does not speculate using derivative instruments.

By using derivative financial instruments to hedge exposures to changes in interest rates, commodity prices and foreign currency, the Company exposes itself to credit risk and market risk. Credit risk is the failure of the counterparty to perform under the terms of the derivative contract. When the fair value of a derivative contract is an asset, the counterparty owes the Company, which creates credit risk for the Company. When the fair value of a derivative contract is a liability, the Company owes the counterparty and therefore, the Company is not exposed to the counterparty’s credit risk in those circumstances. The Company minimizes counterparty credit risk in derivative instruments by entering into transactions with high quality counterparties. The derivative instruments entered into by the Company do not contain credit-risk-related contingent features.

Market risk is the adverse effect on the value of a derivative instrument that results from a change in interest rates, currency exchange rates or commodity prices. The market risk associated with the Company’s derivative instruments is managed by establishing and monitoring parameters that limit the types and degree of market risk that may be undertaken.

Use of Derivative Financial Instruments to Manage Commodity Price Risk. The Company is exposed to risks in energy costs due to fluctuations in energy prices, particularly natural gas. The Company has a hedging program in the United States which allows the Company to mitigate exposure to natural gas volatility with natural gas swap agreements. Fair value is determined based on estimated amounts that would be received or paid to terminate the contracts at the reporting date based on quoted market prices of comparable contracts. The respective current and non-current liabilities are recorded in accrued liabilities and other long-term liabilities and the respective current and non-current assets are recorded in prepaid and other current assets and other long-term assets, as applicable, in the Company’s consolidated balance sheet. As the derivatives are designated and qualify as cash flow hedges, the gains or losses on the natural gas swaps are recorded in stockholders’ equity as a component of other comprehensive income (loss) (“OCI”), net of tax. Reclassifications of the gains and losses on natural gas hedges into earnings are recorded in production costs and subsequently charged to cost of goods sold in the consolidated statements of operations in the period in which the associated inventory is sold. As of June 30, 2018, the Company’s natural gas swaps had a remaining notional quantity of 2.7 million MMBTU to mitigate commodity price volatility through December 2020.

Use of Derivative Financial Instruments to Manage Interest Rate Risk. The Company is exposed to fluctuations in interest rates on its senior secured credit facilities. Changes in interest rates will not affect the market value of such debt but will affect the Company’s interest payments over the term of the loans. Likewise, an increase in interest rates could have a material impact on the Company’s cash flow. The Company hedges the interest rate fluctuations on debt obligations through interest rate cap agreements. The Company records these agreements at fair value as assets or liabilities in its consolidated balance sheet. As the derivatives are designated and qualify as cash flow hedges, the gains or losses on the interest rate cap agreements are recorded in stockholders’ equity as a component of OCI, net of tax. Reclassifications of the gains and losses on the interest rate cap agreements into earnings are recorded as part of interest expense in the consolidated statements of operations as the Company makes its interest payments on the hedged portion of its senior secured credit facilities. Fair value is determined based on estimated amounts that would be received or paid to terminate the contracts at the reporting date based on quoted market prices.

In July 2016, the Company entered into interest rate cap agreements, paying a premium of $1,551 to mitigate interest rate volatility from July 2016 through July 2020 by employing varying cap rates, ranging from 1.50% to 3.00%, on $1,000,000 of notional variable-rate debt. The cap rate currently in effect at June 30, 2018 is 2.00%.

Use of Derivative Financial Instruments to Manage Foreign Currency Risk. The Company is exposed to risks related to its net investments in foreign operations due to fluctuations in foreign currency exchange rates, particularly between the United States dollar and the Euro. In connection with the February 2018 term loan refinancing (see Note 12 to these condensed consolidated financial statements), the Company entered into multiple cross currency interest rate swap arrangements with an aggregate notional amount of €280,000 ($327,102 as of June 30, 2018) to hedge this exposure on the net investments of certain of its Euro-denominated subsidiaries. The Company records these swap agreements at fair value as assets or liabilities in its consolidated balance sheet. As the derivatives are designated and qualify as net investment hedges, changes in the fair value of the swaps attributable to changes in the spot exchange rates are recognized in cumulative translation adjustment (“CTA”) within OCI and are held there until the hedged net investments are sold or substantially liquidated. Changes in the fair value of the swaps attributable to the cross currency basis spread are excluded from the assessment of hedge effectiveness and are recorded in current period earnings. Upon such sale or liquidation, the amount recognized in CTA is reclassified to earnings and reported in the same line item as the gain or loss on the liquidation of the net investments.

The fair values of derivative instruments held as of June 30, 2018 and December 31, 2017 are shown below:

	Balance sheet location	June 30, 2018		December 31, 2017
Derivative assets:
Derivatives designated as cash flow hedges:
Natural gas swaps	Prepaid and other current assets	$	2	$	—
Interest rate caps	Prepaid and other current assets	1,208		$	44
Interest rate caps	Other long-term assets	3,139		999
		4,349		1,043
Derivatives designed as net investment hedges:
Cross currency swaps	Prepaid and other current assets	5,367		—
Cross currency swaps	Other long-term assets	2,294		—
		7,661		—
Total derivative assets		$	12,010	$	1,043
Derivative liabilities:
Derivatives designated as cash flow hedges:
Natural gas swaps	Accrued liabilities	$	25	$	318
Natural gas swaps	Other long-term liabilities	171		130
Total derivative liabilities		$	196	$	448

The following tables show the effect of the Company’s derivative instruments designated as cash flow hedges on accumulated other comprehensive income (“AOCI”) for the three and six months ended June 30, 2018 and 2017:

		Three months ended June 30,
		2018					2017
	Location of gain (loss) reclassified from AOCI into income	Amount of gain (loss) recognized in OCI on derivatives		Amount of gain (loss) reclassified from AOCI into income			Amount of gain (loss) recognized in OCI on derivatives			Amount of gain (loss) reclassified from AOCI into income
Interest rate caps	Interest (expense) income	$	451	$	(58	)	$	(1,839	)	$	(9	)
Natural gas swaps	Cost of goods sold	129		(99		)	(224		)	(28		)
		$	580	$	(157	)	$	(2,063	)	$	(37	)
		Six months ended June 30,
		2018					2017
	Location of gain (loss) reclassified from AOCI into income	Amount of gain (loss) recognized in OCI on derivatives		Amount of gain (loss) reclassified from accumulated OCI into income			Amount of gain (loss) recognized in OCI on derivatives			Amount of gain (loss) reclassified from AOCI into income
Interest rate caps	Interest (expense) income	$	3,303	$	(93	)	$	(4,150	)	$	(11	)
Natural gas swaps	Cost of goods sold	182		(71		)	(759		)	(10		)
		$	3,485	$	(164	)	$	(4,909	)	$	(21	)

The following tables show the effect of the Company’s cash flow hedge accounting on the condensed consolidated statements of operations for the three and six months ended June 30, 2018 and 2017:

	Location and amount of gain (loss) recognized in income on cash flow hedging relationships
	Three months ended June 30,
	2018						2017
	Cost of goods sold			Interest (expense) income			Cost of goods sold			Interest (expense) income
Total amounts of income and expense line items presented in the statement of operations in which the effects of cash flow hedges are recorded	$	(326,309	)	$	(27,221	)	$	(281,853	)	$	(48,176	)
The effects of cash flow hedging:
Gain (loss) on cash flow hedging relationships:
Interest contracts:
Amount of gain (loss) reclassified from AOCI into income	—			(58		)	—			(9		)
Commodity contracts:
Amount of gain (loss) reclassified from AOCI into income	(99		)	—			(28		)	—

	Location and amount of gain (loss) recognized in income on cash flow hedging relationships
	Six months ended June 30,
	2018				2017
	Cost of goods sold		Interest (expense) income		Cost of goods sold		Interest (expense) income
Total amounts of income and expense line items presented in the statement of operations in which the effects of cash flow hedges are recorded	(614,385	)	(56,384	)	(532,072	)	(94,961	)
The effects of cash flow hedging:
Gain (loss) on cash flow hedging relationships:
Interest contracts:
Amount of gain (loss) reclassified from AOCI into income	—		(93	)	—		(11	)
Commodity contracts:
Amount of gain (loss) reclassified from AOCI into income	(71	)	—		(10	)	—

The following tables show the effect of the Company’s net investment hedges on AOCI and the condensed consolidated statements of operations for the three and six months ended June 30, 2018 and 2017:

	Amount of gain (loss) recognized in OCI on derivative				Location of gain (loss) reclassified from AOCI into income	Amount of gain (loss) reclassified from AOCI into income				Location of gain (loss) recognized in income on derivative (amount excluded from effectiveness testing)	Amount of gain (loss) recognized in income on derivative (amount excluded from effectiveness testing)
	Three months ended June 30,					Three months ended June 30,					Three months ended June 30,
	2018		2017			2018		2017			2018		2017
Cross currency swaps	$	16,937	$	—	Gain (loss) on sale of subsidiary	$	—	$	—	Interest (expense) income	$	2,224	$	—

	Amount of gain (loss) recognized in OCI on derivative				Location of gain (loss) reclassified from AOCI into income	Amount of gain (loss) reclassified from AOCI into income				Location of gain (loss) recognized in income on derivative (amount excluded from effectiveness testing)	Amount of gain (loss) recognized in income on derivative (amount excluded from effectiveness testing)
	Six months ended June 30,					Six months ended June 30,					Six months ended June 30,
	2018		2017			2018		2017			2018		2017
Cross currency swaps	$	7,661	$	—	Gain (loss) on sale of subsidiary	$	—	$	—	Interest (expense) income	$	3,391	$	—

The amount of unrealized losses in AOCI that are expected to be reclassified to the consolidated statement of operations over the next twelve months is $479 as of June 30, 2018.

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Income Taxes

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

14. Income Taxes:

The effective income tax rate for the three months ended June 30, 2018 was 45.8% compared to 224.9% for the three months ended June 30, 2017. The effective income tax rate for the six months ended June 30, 2018 was 44.0% compared to (2.5)% for the six months ended June 30, 2017. The Company’s effective income tax rate fluctuates based primarily on changes in income mix (including the effect of loss companies), the impacts of recently enacted U.S. tax law and changes in foreign exchange gains and losses, which create permanent differences in certain jurisdictions.

The difference between the U.S. federal statutory income tax rate and the Company’s effective income tax rate for the six months ended June 30, 2018 was mainly due to the tax effect of permanent differences related to foreign currency exchange gain or loss, inclusion of foreign earnings in the U.S. as a result of recently enacted tax law, pre-tax losses with no associated tax benefit, discrete impacts of opening balance sheet adjustments related to the Sovitec acquisition and state taxes.

The difference between the U.S. federal statutory income tax rate and the Company’s effective income tax rate for six months ended June 30, 2017 was mainly due to the tax effect of repatriating foreign earnings back to the United States as dividends offset by lower tax rates in foreign jurisdictions as compared to the U.S. tax rate, foreign withholdings taxes, state taxes and non-deductible transaction costs.

On December 22, 2017, the U.S. government enacted tax reform legislation (the Tax Cuts and Jobs Act of 2017, or “TCJA”) that introduced significant changes to the taxation of multination corporations. As a result of the TCJA, at December 31, 2017 the Company recorded a provisional tax benefit of $64,343 related to the corporate rate reduction from 35% to 21%, a provisional tax expense of $43,000 related to the one-time mandatory transition tax and a provisional tax benefit of $25,196 related to undistributed foreign earnings that are no longer intended to be permanently reinvested.

Due to the complexities involved in accounting for the enactment of the TCJA, the SEC staff issued Staff Accounting Bulletin (“SAB”) No. 118, which allowed the Company to record provisional amounts in earnings for the year ended December 31, 2017. SAB No. 118 provides that where reasonable estimates can be made, provisional accounting should be employed with respect to such estimates and when no reasonable estimate can be made, the provisional accounting may be based on the tax law in effect prior to the TCJA. The income tax provision for the six months ended June 30, 2018 reflects discrete tax expense with respect to a $1,090 adjustment made to our year-end provisional estimate of the one-time mandatory transition tax. The Company will continue to analyze the effects of the TCJA on its financial statements. Additional revised impacts with respect to the TCJA will be recorded as they are identified during the allowed measurement period prescribed by SAB No. 118. This measurement period extends up to one year from the enactment date.

The final impact of the TCJA may differ from the provisional amounts that have been recognized, possibly materially, due to, among other items, changes in the Company’s interpretation of the TCJA, legislative or administrative actions taken to clarify the intent of the statutory language which may differ from the Company’s current interpretation, any changes in accounting standards for income taxes made in response to the TCJA or any updates or changes to original estimates used to compute the provisional amounts. Updates to original estimates may include changes to earnings estimates as well as applicable foreign exchange rates.

The TCJA enacted certain provisions that take effect on January 1, 2018. These provisions include, but are not limited to, the new Global Intangible Low-Taxed Income (“GILTI”) tax rules. Due to the complexity of the new GILTI tax, the Company is continuing to evaluate the GILTI provision of the TCJA and its impact on the financial statements, which remains uncertain. Per recent guidance issued by the FASB, the Company is permitted to make an accounting policy election to either (1) treat the taxes incurred as a result of the GILTI provision as a current-period expense when incurred or (2) factor such amounts into its measurement of deferred taxes. At this time, the Company is electing to treat any tax expense incurred as a result of GILTI as a current-period expense.

With respect to operating results for the three and six months ended June 30, 2018, the Company has continued to incorporate an estimate of the GILTI income inclusion when estimating its U.S. GAAP annual effective tax rate. The Company expects this inclusion to be included in its 2018 U.S. taxable income. However, the estimated 2018 GILTI income inclusion may change materially as the Company continues to evaluate future legislative or administrative guidance that is put forth, any updates to assumptions and figures used for the current estimate or as a result of future tax planning or changes to the Company’s current structure and business.

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Benefit Plans

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Benefit Plans

15. Benefit Plans:

The following information is provided for (1) the Company-sponsored defined benefit pension plans covering employees in the U.S. and certain employees at its foreign subsidiaries, (2) the Company-sponsored unfunded plans to provide certain health care benefits to retired employees in the U.S. and Canada, and (3) the Company’s defined benefit supplementary retirement plans which provide benefits for certain U.S. employees in excess of qualified plan limitations.

Components of net periodic expense (benefit) are as follows:

Defined Benefit Pension Plans

	U.S.						Foreign
	Three months ended June 30,						Three months ended June 30,
	2018			2017			2018			2017
Service cost	$	223		$	304		$	845		$	941
Interest cost	2,369			2,536			1,608			1,254
Expected return on plan assets	(3,176		)	(3,061		)	(1,628		)	(923		)
Amortization of net loss	—			—			12			—
Curtailment gain recognized	(576		)	—			—			—
Net periodic expense (benefit)	$	(1,160	)	$	(221	)	$	837		$	1,272
	U.S.						Foreign
	Six months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Service cost	$	533		$	609		$	1,732		$	1,783
Interest cost	4,741			5,072			3,113			2,685
Expected return on plan assets	(6,350		)	(6,122		)	(2,947		)	(2,217		)
Amortization of net less	—			—			25			—
Curtailment gain recognized	(576		)	—			—			—
Net periodic expense (benefit)	$	(1,652	)	$	(441	)	$	1,923		$	2,251

Supplemental Retirement Plans

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Interest cost	$	110	$	123	$	220	$	246
Net periodic expense	$	110	$	123	$	220	$	246

Other Postretirement Benefit Plans

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Service cost	$	3		$	5		$	9		$	10
Interest cost	27			41			65			81
Amortization of prior service credit	(20		)	(20		)	(39		)	(39		)
Amortization of net gain	(11		)	(19		)	(22		)	(38		)
Net periodic expense (benefit)	$	(1	)	$	7		$	13		$	14

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Commitments and Contingent Liabilities

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingent Liabilities

16. Commitments and Contingent Liabilities:

There is a risk of environmental impact in chemical manufacturing operations. The Company’s environmental policies and practices are designed to ensure compliance with existing laws and regulations and to minimize the possibility of significant environmental impact. The Company is also subject to various other lawsuits and claims with respect to matters such as governmental regulations, labor and other actions arising out of the normal course of business. While management believes that the liabilities resulting from such lawsuits and claims are not probable or reasonably estimable, certain accruals have been reflected in our condensed consolidated financial statements and are described in detail within this note.

The Company triggered the requirement of New Jersey’s Industrial Site Recovery Act (“ISRA”) statute with the PQ Holdings stock transfer/corporate merger in December 2004. As required under ISRA, a General Information Notice with respect to the Company’s two New Jersey locations was filed with the New Jersey Department of Environmental Protection (“NJDEP”) in December 2004 and again in July 2007. Based on an initial review of the facilities by the NJDEP in 2005, the Company estimated that $500 would be required for contamination assessment and removal work of one specific contaminant (polychlorinated biphenyls) that exceeded applicable NJDEP standards at these facilities, and had recorded a reserve for such amount as of December 31, 2005. During subsequent years, it was determined that additional assessment, removal and remediation work would be required and the reserve was increased to cover the estimated cost of such work. In addition, during this period, work had been performed and the reserve was reduced for actual costs incurred for the assessment and remediation work. Work at the Carlstadt facility has been completed and is closed from an ISRA standpoint, but as of June 30, 2018 and December 31, 2017, the Company has recorded a reserve of $948 and $842, respectively, for costs required for contamination assessment and removal work at Rahway. There may be additional costs related to the remediation of Rahway, but until further investigation takes place, the Company cannot reasonably estimate the amount of additional liability that may exist.

As part of a Delaware River Basin Commission (“DRBC”) required Pollutant Minimization Plan (“PMP”), in July 2013, the Company’s Chester facility conducted limited paint sampling for polychlorinated biphenyls (“PCBs”). Also, as part of demolition, repair and maintenance projects scheduled for the Company’s Baltimore facility in 2014, the Company conducted limited paint sampling during the fall of 2013 for waste categorization purposes. Paint samples were analyzed for PCB Aroclor 1254, the specific PCB congener commonly used in the manufacture of paint until the late 1970s. The Company’s analytical results indicated that PCB Aroclor 1254 is present in paint on some structures (e.g., piping, structural steel, tanks) in excess of the fifty (50) parts per million (“ppm”) regulatory threshold. Under the Toxic Substances Control Act (“TSCA”), there is no requirement to test in use paint for PCB content. However, once PCB content is identified at concentrations at or above the regulatory threshold, absent specific approval from the U.S. Environmental Protection Agency (“EPA”), the PCB-containing paint is regulated as an unauthorized use of PCBs, and the paint must be addressed. The Company abated painted surfaces that have tested positive for PCBs at levels exceeding 50 ppm at Baltimore in 2015 and early 2016. Similar abatement of painted structures as necessary at Chester have also been substantially completed. Characterization studies to evaluate whether soils have been impacted at Baltimore have been initiated as required under the TSCA, and have yet to commence at Chester. As of June 30, 2018 and December 31, 2017, the Company has recorded a reserve of $670 and $701, respectively, for the remediation costs of PCB impacted soils at the Company’s facilities.

In 2008, the Company sold the property of a manufacturing facility located in the United States to the local port authority. In 2009, the port authority commissioned an environmental investigation of portions of the property. In 2010, the port authority advised the Company of alleged soil and groundwater contamination on the property and alleged the Company liable for certain conditions. The Company received and reviewed the environmental investigation documentation and determined it may have liability with respect to some, but not all, of the alleged contamination. As of June 30, 2018 and December 31, 2017, the Company has recorded a reserve of $821 and $837, respectively, for costs related to this potential liability.

The Company has recorded a reserve of $1,107 and $1,245 as of June 30, 2018 and December 31, 2017, respectively, to address remaining subsurface remedial and wetlands/marsh management activities at the Company’s Martinez, CA site. Although currently a sulfuric acid regeneration plant, the site originally was operated by Mountain Copper Company (“Mococo”) as a copper smelter. Also, the site sold iron pyrite to various customers and allowed their customers to deposit waste iron pyrite cinder and slag on the site. The property is adjacent to Peyton Slough, where Mococo had a permitted discharge point from its process. In 1997, the San Francisco Bay Regional Water Quality Control Board (“RWQCB”) required characterization and remediation of Peyton Slough for Copper, Zinc and Acidic Soils. Various remediation activities were undertaken and completed, and the site has received final concurrence from the Army Corps with respect to the completed work. The RWQCB has agreed that Eco Services has achieved the goals for vegetative cover, but the current marsh condition is not sustainable without continued operation of the tide gates. The Company is continuing to work with the RWQCB on a plan to involve the County and work towards development of an alliance for operating, maintaining and funding the tide gates in the future.

As of June 30, 2018 and December 31, 2017, the Company has recorded a reserve of $1,080 and $1,220, respectively, for subsurface remediation and the Soil Vapor Extraction Project at the Company’s Dominguez, CA site. In the 1980s and 1990s, the EPA and the Los Angeles Regional Water Quality Control Board conducted investigations of the site due to historic chlorinated pesticide and chlorinated solvent use. Soil and groundwater beneath the site were impacted by chlorinated solvents and associated breakdown products, petroleum hydrocarbons, chlorinated pesticides and metals. A Corrective Measures Plan approved in October 2011 requires (1) soil vapor extraction (“SVE”) in affected areas, (2) covering of unpaved areas containing pesticide impacted soil, and (3) annual groundwater monitoring of the perched water-bearing zone. Installation of the SVE unit has been completed and startup has occurred. The California Department of Toxic Substances Control (“DTSC”) has granted conditional approval of the Company’s soil management, and monitoring and maintenance plans. Most recently, the DTSC is requiring the Company to delineate the PCE plume on the eastern boundary of the site. The Company has submitted an action plan to address this matter and is awaiting comments from the DTSC.

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Reportable Segments

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Reportable Segments

17. Reportable Segments:

Summarized financial information for the Company’s (1) Environmental Catalysts & Services and (2) Performance Materials & Chemicals reportable segments is shown in the following table:

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Net sales:
Silica Catalysts	$	17,347		$	20,045		$	33,820		$	37,185
Refining Services	112,071			103,947			212,785			198,088
Environmental Catalysts & Services(1)	129,418			123,992			246,605			235,273
Performance Chemicals	183,761			169,038			373,724			339,987
Performance Materials	126,538			99,470			189,280			153,243
Eliminations	(4,138		)	(2,404		)	(7,021		)	(4,521		)
Performance Materials & Chemicals	306,161			266,104			555,983			488,709
Inter-segment sales eliminations(2)	(866		)	(829		)	(1,678		)	(1,784		)
Total	$	434,713		$	389,267		$	800,910		$	722,198
Segment Adjusted EBITDA:(3)
Environmental Catalysts & Services(4)	$	64,864		$	64,311		$	123,285		$	120,678
Performance Materials & Chemicals	73,389			66,333			130,541			118,856
Total Segment Adjusted EBITDA(5)	$	138,253		$	130,644		$	253,826		$	239,534

⁽¹⁾ Excludes the Company’s proportionate share of sales from the Zeolyst International and Zeolyst C.V. joint ventures (collectively, the “Zeolyst Joint Venture”) accounted for using the equity method (see Note 10 to these condensed consolidated financial statements for further information). The proportionate share of sales is $49,513 and $30,661 for the three months ended June 30, 2018 and 2017, respectively. The proportionate share of sales is $87,862 and $63,369 for the six months ended June 30, 2018 and 2017, respectively.

⁽²⁾ The Company eliminates intersegment sales when reconciling to the Company’s consolidated statements of operations.

⁽³⁾ The Company defines Adjusted EBITDA as EBITDA adjusted for certain items as noted in the reconciliation below. Management evaluates the performance of its segments and allocates resources based on several factors, of which the primary measure is Adjusted EBITDA. Adjusted EBITDA should not be considered as an alternative to net income as an indicator of the Company’s operating performance. Adjusted EBITDA as defined by the Company may not be comparable with EBITDA or Adjusted EBITDA as defined by other companies.

⁽⁴⁾ The Adjusted EBITDA from the Zeolyst Joint Venture included in the Environmental Catalysts and Services segment is $17,874 for the three months ended June 30, 2018, which includes $13,616 of equity in net income plus $1,659 of amortization of investment in affiliate step-up plus $2,599 of joint venture depreciation, amortization and interest. The Adjusted EBITDA from the Zeolyst Joint Venture included in the Environmental Catalysts and Services segment is $13,205 for the three months ended June 30, 2017, which includes $8,675 of equity in net income plus $1,659 of amortization of investment in affiliate step-up plus $2,871 of joint venture depreciation, amortization and interest.

The Adjusted EBITDA from the Zeolyst Joint Venture included in the Environmental Catalysts and Services segment is $34,681 for the six months ended June 30, 2018, which includes $25,442 of equity in net income plus $3,317 of amortization of investment in affiliate step-up plus $5,922 of joint venture depreciation, amortization and interest. The Adjusted EBITDA from the Zeolyst Joint Venture included in the Environmental Catalysts and Services segment is $25,292 for the six months ended June 30, 2017, which includes $14,499 of equity in net income plus $5,283 of amortization of investment in affiliate step-up plus $5,510 of joint venture depreciation, amortization and interest.

⁽⁵⁾ Total Segment Adjusted EBITDA differs from the Company’s consolidated Adjusted EBITDA due to unallocated corporate expenses.

A reconciliation of net income (loss) attributable to PQ Group Holdings to Segment Adjusted EBITDA is as follows:

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018		2017
Reconciliation of net income (loss) attributable to PQ Group Holdings Inc. to Segment Adjusted EBITDA
Net income (loss) attributable to PQ Group Holdings Inc.	$	15,782		$	(1,609	)	$	15,996	$	(4,063	)
Provision for income taxes	13,649			3,007			13,120		97
Interest expense, net	27,221			48,176			56,384		94,961
Depreciation and amortization	46,983			42,620			95,471		83,206
Segment EBITDA	103,635			92,194			180,971		174,201
Unallocated corporate expenses	9,358			7,882			17,046		15,589
Joint venture depreciation, amortization and interest	2,599			2,871			5,922		5,510
Amortization of investment in affiliate step-up	1,659			1,658			3,317		5,282
Amortization of inventory step-up	—			—			1,603		871
Debt extinguishment costs	—			—			5,879		—
Net loss on asset disposals	4,752			2,577			5,904		2,925
Foreign currency exchange loss	6,757			14,370			11,820		16,356
Non-cash revaluation of inventory, including LIFO	121			—			5,047		2,479
Management advisory fees	—			1,250			—		2,500
Transaction and other related costs	257			2,955			685		4,334
Equity-based and other non-cash compensation	3,796			1,176			7,627		2,828
Restructuring, integration and business optimization expenses	2,405			1,351			3,484		3,052
Defined benefit pension plan cost	(402		)	685			148		1,409
Other	3,316			1,675			4,373		2,198
Segment Adjusted EBITDA	$	138,253		$	130,644		$	253,826	$	239,534

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Restructuring and Other Related Costs

6 Months Ended

Jun. 30, 2018

Restructuring and Related Activities [Abstract]

Restructuring and Other Related Costs

18. Restructuring and Other Related Costs:

The following table presents the components of restructuring and other related costs for the three and six months ended June 30, 2018 and 2017 included in other operating expense, net in the accompanying condensed consolidated statements of operations:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Severance and other employee costs related to legacy Eco restructuring plan	$	—	$	—	$	—	$	830
Severance and other employee costs related to performance materials plant closure	—		—		107		—
Other related costs	10		276		23		642
	$	10	$	276	$	130	$	1,472

Legacy Eco Restructuring Plan

On July 30, 2014, Eco Services Operations LLC (“Eco Services”), a newly formed Delaware limited liability company and indirect subsidiary of certain investment funds affiliated with CCMP Capital Advisors, LP, entered into an Asset Purchase Agreement with Solvay USA, Inc. (“Solvay”), a Delaware corporation, which provided for the sale, transfer and assignment by Solvay and the acquisition, acceptance and assumption by Eco Services, of substantially all of the assets of Solvay’s Eco Services business unit of Solvay’s regeneration and virgin sulfuric acid production business operations in the United States (the “2014 Acquisition”). Prior to the Asset Purchase Agreement with Solvay, Eco Services operated as a business unit within Solvay, which is an indirect, wholly owned subsidiary of Solvay SA.

Subsequent to the 2014 Acquisition, the Company initiated a restructuring plan designed to improve organizational efficiency and streamline the operations of Eco Services as a stand-alone company. The primary impact of the plan to the Company’s consolidated results of operations was the recognition of severance costs related to a reduction-in-force. These costs included benefits payable under ongoing Company severance plan arrangements, whereby payments are attributable to employee services rendered with benefits that accumulate over time. The liabilities and associated charges related to these severance costs are recognized by the Company when payment of the benefits becomes probable and estimable. Charges related to severance costs for the restructuring plan were $0 and $830 for the six months ended June 30, 2018 and 2017, respectively. No severance costs were incurred related to this plan for the three months ended June 30, 2018 and 2017.

Performance Materials Plant Closure

In September 2017, the Company approved and announced a plan to consolidate its manufacturing operations in Europe for the performance materials product group and close its facility in Kirchheimbolanden, Germany. The plan is part of the Company’s overall strategy with respect to the Acquisition (see Note 6 to these condensed consolidated financial statements) and the realization of cost and other synergies in connection with the transaction. The facility will remain in operation over the short term in a reduced capacity through the end of 2018. The Company is in the process of relocating the manufacturing equipment to other facilities, and is exploring strategic alternatives for the building and land. As a result, the Company classified the plant under the “held and used” accounting model, as it did not meet the criteria to be classified as “held for sale.”

As a result of the decision and announcement regarding the plant, the Company performed an impairment assessment related to the fixed assets of the facility upon the approval of the plan. In conducting the recoverability assessment, the Company compared the carrying value of the asset group that includes the plant to the undiscounted future cash flows of the asset group, noting that there was no indication of impairment. The Company does not anticipate the acceleration of depreciation on the fixed assets associated with the plant, as the Company continues to utilize the assets and ultimately expects to relocate the equipment.

In addition to the previously recognized charges related to the European restructuring, the Company recorded an additional severance charge related to the pending closure and other cost reductions for its performance materials product group in Europe of $107 for the six months ended June 30, 2018. There were no additional severance charges incurred during the three months ended June 30, 2018. The charge was fully recognized as of June 30, 2018 based on the types of benefits provided and the criteria for restructuring and exit cost recognition.

Although the Company does not expect to incur additional severance costs related to the closure, the Company will incur additional costs related to the dismantling, transportation and reassembly of the manufacturing equipment after the plant ceases operations.

Rollforward of Restructuring Liabilities

The activity in the accrued liability balance associated with the Company’s restructuring plans, all of which related to severance and other employee costs, was as follows for the six months ended June 30, 2018:

	Legacy Eco Restructuring Plan			Performance Materials Plant Closure			Total Restructuring Charges
Balance at December 31, 2017	$	215		$	3,123		$	3,338
Restructuring charges	—			107			107
Cash payments	(192		)	(1,924		)	(2,116		)
Foreign exchange impact	—			(7		)	(7		)
Balance at June 30, 2018	$	23		$	1,299		$	1,322

The remaining accrued liability balance associated with the restructuring plans at June 30, 2018 is expected to be paid in 2018.

Other Related Costs

The Company incurred severance and other costs of $10 and $276 for the three months ended June 30, 2018 and 2017, respectively, and $23 and $642 for the six months ended June 30, 2018 and 2017, respectively. These costs were not associated with formal restructuring plans and primarily related to severance charges for certain employees, professional fees and other expenses related to the Company’s organizational changes.

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Earnings per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Earnings per Share

19. Earnings per Share:

Basic earnings per share is calculated as income (loss) available to common stockholders, divided by the weighted average number of common shares outstanding during the period. The weighted average number of common shares outstanding during the period for the computation of basic earnings per share excludes restricted stock awards that have legally been issued but are nonvested during the period, as the sale of these shares is prohibited pending satisfaction of certain vesting conditions by the award recipients in order to earn the rights to the shares.

Diluted earnings per share is calculated as income (loss) available to common stockholders, divided by the weighted average number of common and potential common shares outstanding during the period, if dilutive. Potential shares reflect unvested restricted stock awards and restricted stock units with service conditions as well as options to purchase common stock, which have been included in the diluted earnings per share calculation using the treasury stock method.

The reconciliation from basic to diluted weighted average shares outstanding is as follows:

	Three months ended June 30,		Six months ended June 30,
	2018	2017	2018	2017
Weighted average shares outstanding – Basic	133,222,463	104,015,815	133,188,303	103,981,851
Dilutive effect of unvested common shares and restricted stock units with service conditions and assumed stock option exercises and conversions	987,277	—	859,059	—
Weighted average shares outstanding – Diluted	134,209,740	104,015,815	134,047,362	103,981,851

Basic and diluted earnings per share are calculated as follows:

	Three months ended June 30,					Six months ended June 30,
	2018		2017			2018		2017
Numerator:
Net income (loss) attributable to PQ Group Holdings Inc.	$	15,782	$	(1,609	)	$	15,996	$	(4,063	)
Denominator:
Weighted average shares outstanding – Basic	133,222,463		104,015,815			133,188,303		103,981,851
Weighted average shares outstanding – Diluted	134,209,740		104,015,815			134,047,362		103,981,851
Net income (loss) per share:
Basic income (loss) per share	$	0.12	$	(0.02	)	$	0.12	$	(0.04	)
Diluted income (loss) per share	$	0.12	$	(0.02	)	$	0.12	$	(0.04	)

The table below presents the details of the Company’s equity-based awards outstanding at the end of each respective period that were excluded from the calculation of diluted earnings per share:

	June 30,
	2018	2017
Restricted stock awards with performance only targets not yet achieved	1,659,050	1,769,447
Stock options with performance only targets not yet achieved	586,253	651,255
Anti-dilutive restricted stock awards and restricted stock units	—	341,880
Anti-dilutive stock options	621,747	1,539,266

Restricted stock awards and stock options with performance only vesting conditions are not included in the dilution calculation, as the performance targets have not been achieved as of the end of the respective periods. For the three and six months ended June 30, 2017, all of the Company’s restricted stock awards and stock options subject to service vesting conditions were considered anti-dilutive, as the Company was in a net loss position. Anti-dilutive awards are not included in the dilution calculation, as their inclusion would have the effect of increasing diluted income per share.

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Supplemental Cash Flow Information

6 Months Ended

Jun. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

20. Supplemental Cash Flow Information:

The following table presents supplemental cash flow information for the Company:

	Six months ended June 30,
	2018		2017
Cash paid during the period for:
Income taxes	$	11,053	$	15,904
Interest	60,210		91,710
Non-cash investing activity:
Capital expenditures acquired on account but unpaid as of the period end	11,875		11,681

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the unaudited condensed consolidated balance sheets as of June 30, 2018 and 2017 to the total of the same amounts shown in the unaudited condensed consolidated statements of cash flows for the six months then ended:

	June 30,
	2018		2017
Cash and cash equivalents	$	52,553	$	50,457
Restricted cash included in prepaid and other current assets	1,332		4,976
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	$	53,885	$	55,433

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Subsequent Events

6 Months Ended

Jun. 30, 2018

Subsequent Events [Abstract]

Subsequent Events

21. Subsequent Events:

The Company has evaluated subsequent events since the balance sheet date and determined that there are no additional items to disclose.

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Background and Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The condensed consolidated financial statements included herein are unaudited. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) have been condensed or omitted pursuant to such rules and regulations for interim reporting. In the opinion of management, all adjustments of a normal and recurring nature necessary to state fairly the financial position and results of operations have been included. The results of operations are not necessarily indicative of the results to be expected for the full year. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. Other than the update to our accounting policies described in Note 3, the Company has continued to follow the accounting policies set forth in those consolidated financial statements.

Recently Issued Accounting Standards

Recently Adopted Accounting Standards

In August 2017, the Financial Accounting Standards Board (“FASB”) issued amendments intended to better align hedge accounting with an entity’s risk management activities. The amendments expand hedge accounting for non-financial and financial risk components and revise the measurement methodologies to better align with an entity’s risk management activities. Separate presentation of hedge ineffectiveness is eliminated to provide greater transparency of the full impact of hedging by requiring presentation of the results of the hedged item and hedging instrument in a single financial statement line item. In addition, the amendments reduce complexity by simplifying the manner in which assessments of hedge effectiveness may be performed. The new guidance is effective for public companies for annual periods beginning after December 15, 2018, including interim periods within those years. Early adoption is permitted, and the guidance should be applied prospectively for the amended presentation and disclosure requirements, and through a cumulative-effect adjustment to beginning retained earnings for any cash flow and net investment hedges existing at the date of adoption. The Company early adopted the guidance effective January 1, 2018. The Company’s cash flow hedges in place at the date of adoption yielded an immaterial amount of ineffectiveness; therefore, the Company did not reflect an adjustment to beginning retained earnings upon adoption. The amended presentation and disclosure requirements are reflected under the new guidance in Note 13 tothese condensed consolidated financial statements.

In May 2017, the FASB issued guidance to clarify which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. Under the new guidance, an entity should account for the effects of a change in a share-based payment award using modification accounting unless the fair value, vesting conditions and classification as either a liability or equity are all the same with respect to the award immediately prior to modification and the modified award itself. The new guidance is effective for annual periods beginning after December 15, 2017, including interim periods within those years, and the new guidance should be applied prospectively to awards modified on or after the adoption date. The Company adopted the new guidance on January 1, 2018 as required, with no impact on the Company’s condensed consolidated financial statements upon adoption.

In March 2017, the FASB issued guidance to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost (collectively, “pension costs”). Under current GAAP, there are several components of pension costs which are presented net to arrive at pension costs as included in the income statement and disclosed in the notes. As part of this amendment to the existing guidance, the service cost component of pension costs will be bifurcated from the other components and included in the same line items of the income statement as compensation costs are reported. The remaining components will be reported together below operating income on the income statement, either as a separate line item or combined with another line item on the income statement and disclosed. Additionally, with respect to capitalization to inventory, fixed assets, etc., only the service cost component will be eligible for capitalization upon adoption of the guidance. The new guidance is effective for public companies for annual periods beginning after December 15, 2017, including interim periods within those years. The amendments should be applied retrospectively upon adoption with respect to the presentation of the service and other cost components of pension costs in the income statement, and prospectively for the capitalization of the service cost component in assets.

The Company adopted the new guidance on January 1, 2018 as required. Prior to the adoption of the guidance, the Company reflected its pension costs within cost of goods sold and selling, general and administrative expenses in the condensed consolidated statements of operations, depending on whether the costs were associated with employees involved in manufacturing or back office support functions. Under the new guidance, the service cost component of the Company’s pension costs remained in the same line items of the condensed consolidated statements of operations, but the remaining components are now reported as part of nonoperating income in the other (income) expense, net line item of the condensed consolidated statements of operations. Although the guidance requires retrospective application upon adoption, a practical expedient permits the Company to use the amounts disclosed in its pension and other post-retirement benefit plan note as its basis of estimation for the prior comparative periods. The Company utilized the practical expedient, and $69 and $332 of a net pension benefit for the three and six months ended June 30, 2017, respectively, was reclassified to other (income) expense, net. For the three and six months ended June 30, 2018, the amount of pension costs included in other (income) expense, net was a net benefit of $1,285 and $1,770, respectively.

In January 2017, the FASB issued guidance that clarifies the definition of a business and provides revised criteria and a framework to determine whether an integrated set of assets and activities is a business. For public companies, the new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those years. The Company adopted the new guidance on January 1, 2018 as required, with no impact on the Company’s condensed consolidated financial statements upon adoption.

In November 2016, the FASB issued guidance which clarifies the classification and presentation of changes in restricted cash on the statement of cash flows. The updates in the guidance require that the statement of cash flows explain the change during the period in the total of cash, cash equivalents and restricted cash when reconciling the beginning-of-period and end-of-period total amounts. The updates also require a reconciliation between cash, cash equivalents and restricted cash presented on the balance sheet to the total of the same amounts presented on the statement of cash flows. For public companies, the new guidance is effective for fiscal years beginning after December 15, 2017 and interim periods within those years, and the new guidance should be applied retrospectively to each period presented.

The Company adopted the new guidance on January 1, 2018 as required. As of June 30, 2018 and 2017, the Company had $1,332 and $4,976, respectively, of restricted cash included in prepaid and other current assets on its condensed consolidated balance sheets related to its New Market Tax Credit financing arrangements as well as other small restricted cash balances. Changes in the Company’s restricted cash balances prior to the adoption of the new guidance were reflected within cash flows from investing activities in the Company’s condensed consolidated statements of cash flows. The prior comparative period in the Company’s condensed consolidated statement of cash flows has been updated to conform to the new guidance. See Note 20 to these condensed consolidated financial statements for supplemental cash flow disclosures.

In August 2016, the FASB issued guidance which clarifies the classification of certain cash receipts and cash payments in the statement of cash flows, including debt prepayment or extinguishment costs and distributions from certain equity method investees. For public companies, the new guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years, and the new guidance should be applied retrospectively to each period presented. The Company adopted the new guidance on January 1, 2018 as required. There was no impact to the Company’s condensed consolidated statement of cash flows for the six months ended June 30, 2017. The Company applied the new guidance to the term loan refinancing that occurred during the six months ended June 30, 2018; see Note 12 to these condensed consolidated financial statements for further information on the debt refinancing transaction. There were no other items in the new guidance which necessitated a change in the Company’s reporting in its condensed consolidated statements of cash flows for the six months ended June 30, 2018 or 2017.

In May 2014, the FASB issued accounting guidance (with subsequent targeted amendments) to significantly enhance comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets. The core principle of the guidance is that revenue recognized from a transaction or event that arises from a contract with a customer should reflect the consideration to which an entity expects to be entitled in exchange for goods or services provided. To achieve that core principle, the new guidance sets forth a five-step revenue recognition model that will need to be applied consistently to all contracts with customers, except those that are within the scope of other topics in the Accounting Standards Codification (“ASC”). Also required are enhanced disclosures to help users of financial statements better understand the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. The enhanced disclosures include qualitative and quantitative information about contracts with customers, significant judgments made in applying the revenue guidance, and assets recognized related to the costs to obtain or fulfill a contract. For public companies, the new requirements are effective for annual reporting periods beginning after December 15, 2017, including interim periods within those years. The Company reviewed its key revenue streams and assessed the underlying customer contracts within the framework of the new guidance. The Company evaluated the key aspects of its revenue streams for impact under the new guidance and performed a detailed analysis of its customer agreements to quantify the changes under the guidance. The Company concluded that the guidance did not have a material impact on its existing revenue recognition practices upon adoption on January 1, 2018. The Company implemented the guidance under the modified retrospective transition method of adoption. Comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. The impact of adoption of the new revenue recognition guidance was immaterial for the six months ended June 30, 2018, and there was no transition adjustment required upon adoption. See Note 3 to these condensed consolidated financial statements for additional disclosures required by the new guidance.

Accounting Standards Not Yet Adopted

In June 2018, the FASB issued guidance which conforms the accounting for the issuance of all share-based payments using the same accounting model. Previously, the accounting for share-based payments to non-employees was covered under a different framework than those made to employees. Under the new guidance, awards to both employees and non-employees will essentially follow the same model, with small variations related to determining the term assumption when valuing a non-employee award as well as a different expense attribution model for non-employee awards. The new guidance is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. The Company is currently evaluating the effect that the new guidance would have on its consolidated financial statements.

In February 2018, the FASB issued guidance which will permit entities to make an election to reclassify income tax effects stranded in accumulated other comprehensive income (“AOCI”) to retained earnings as a result of tax reform legislation enacted by the U.S. government on December 22, 2017. The standard is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, with early adoption permitted in any interim period for which the financial statements have not yet been issued. Prior to the enactment of the tax reform legislation on December 22, 2017, the Company had amounts recorded in AOCI related to its domestic pension, postretirement and supplementary benefit plans and cash flow hedging relationships that were based on pre-enactment tax rates. The Company is evaluating the impact that the new guidance will have on its consolidated financial statements. If the Company makes the election to reclassify the stranded income tax effects from AOCI, it may do so using one of two transition methods: restrospectively, or at the beginning of the period of adoption.

In January 2017, the FASB issued guidance which eliminates the second step from the traditional two-step goodwill impairment test. Under current guidance, an entity performed the first step of the goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount; if an impairment loss was indicated, the entity computed the implied fair value of goodwill to determine whether an impairment loss existed, and if so, the amount to recognize. Under the new guidance, an impairment loss is recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value (the Step 1 test), with no further testing required. Any impairment loss recognized is limited to the amount of goodwill allocated to the reporting unit. The new guidance is effective for public companies that are Securities and Exchange Commission (“SEC”) registrants for fiscal years beginning after December 15, 2019, with early adoption permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The Company will apply the guidance prospectively to goodwill impairment tests subsequent to the adoption date.

In June 2016, the FASB issued guidance that affects loans, trade receivables and any other financial assets that have the contractual right to receive cash. Under the new guidance, an entity is required to recognize expected credit losses rather than incurred losses for financial assets. The new guidance is effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. The Company believes that the new guidance will not have a material impact on its consolidated financial statements.

In February 2016, the FASB issued guidance (with subsequent targeted amendments) that modifies the accounting for leases. Under the new guidance, a lessee will recognize assets and liabilities for most leases (including those classified under existing GAAP as operating leases, which based on current standards are not reflected on the balance sheet), but will recognize expenses similar to current lease accounting. For public companies, the new guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those years. Early adoption is permitted. The new guidance must be adopted using either a (1) modified retrospective transition method, in which all periods presented in the financial statements reflect the impact of the new guidance, or (2) prospective method at the date of adoption, with a cumulative-effect adjustment to the opening balance of retained earnings. The Company has operating lease agreements for which it expects to recognize right of use assets and corresponding liabilities on its balance sheet upon adoption of the new guidance. The Company has prepared a detailed plan to implement the new guidance, gathered the information related to its current lease population, and is assessing its leases in the context of the new framework. The Company is working with a vendor to implement a lease management system which will assist in delivering the required accounting changes. The Company is currently evaluating the impact that the new guidance will have on its consolidated financial statements, business processes, systems and control environment. The Company does not plan to implement the guidance prior to the required adoption date of January 1, 2019, and the Company plans to use the prospective method at the date of adoption.

Revenue Recognition Model

In determining the appropriate amount of revenue to be recognized as the Company fulfills its obligations under its agreements, the Company performs the following steps: (i) identification of the contract with the customer; (ii) determination of whether the promised goods or services are performance obligations, including whether they are distinct in the context of the contract; (iii) measurement of the transaction price; (iv) allocation of the transaction price to the performance obligations based on estimated selling prices; and (v) recognition of revenue when (or as) the Company satisfies each performance obligation.

The Company identifies a contract when an agreement with a customer creates legally enforceable rights and obligations, which occurs when a contract has been approved by both parties, the parties are committed to perform their respective obligations, each party’s rights and payment terms are clearly identified, commercial substance exists and it is probable that the Company will collect the consideration to which it is entitled. The Company and its customers typically enter into master service agreements (“MSA”), which establish the terms, including prices, under which orders to purchase goods may be placed. In these instances, the Company’s contract with a customer is the purchase order issued under the MSA. Certain of the Company’s MSAs contain provisions regarding the purchase of a minimum quantity of goods. Under these circumstances, the Company considers the MSA to be a legally enforceable contract.

The Company identifies a performance obligation in a contract for each promised good that is separately identifiable from other promises in the contract and for which the customer can benefit from the good. The majority of the Company’s contracts have a single performance obligation, which is the promise to transfer individual goods to the customer. The Company has certain contracts that include multiple performance obligations under which the purchase price for each distinct performance obligation is defined in the contract. These distinct performance obligations may include stand-ready provisions, which are arrangements to provide a customer assurance that they will have access to output from the Company’s manufacturing facilities, or monthly reservations of capacity fees. The Company considers stand-ready provisions and reservation of capacity fees to be performance obligations satisfied over time. Revenues related to stand-ready provisions and reservation of capacity fees are recognized throughout the contract term.

As described above, the Company’s MSAs with its customers outline prices for individual products or contract provisions. MSAs in the Company’s performance chemicals and refining services product groups may contain provisions whereby raw materials costs are passed-through to the customer per the terms of their contract. The Company’s exposure to fluctuations in raw materials prices is limited, as the majority of pass-through contract provisions reset based on fluctuations in the underlying raw material price. MSAs in the Company’s refining services product group also contain take-or-pay arrangements, whereby the customer would incur a penalty in the form of a shortfall volume fee. Currently there is no history in which customers fail to meet the contractual minimum. Revenue from product sales are recorded at the net sales price, which includes estimates of variable consideration for which reserves are established and which result from discounts, returns or other allowances that are offered within contracts between the Company and its customers.

The Company recognizes revenues when performance obligations under the terms of a contract with its customer are satisfied, which generally occurs at a point in time by transferring control of a product to the customer. The Company determines the point in time when a customer obtains control of a product and the Company satisfies the performance obligation by considering factors including when the Company has a right to payment for the product, the customer has legal title to the product, the Company has transferred possession of the product, the customer has assumed the risks and rewards of ownership of the product and the customer has accepted the product. Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring goods. The Company does not have any significant payment terms as payment is received at, or shortly after, the point of sale.

Contract Assets and Liabilities

A contract asset is a right to consideration in exchange for goods that the Company has transferred to a customer when that right is conditional on something other than the passage of time. A contract liability exists when the Company receives consideration in advance of performance obligations. Other than trade accounts receivable and customer return accruals, the Company has not recorded any additional contract assets or contract liabilities on its condensed consolidated balance sheets as of June 30, 2018.

Practical Expedients and Accounting Policy Elections

The Company has elected to use certain practical expedients and has made certain accounting policy elections as permitted under the new revenue recognition guidance. Certain of the Company’s contracts with customers are based on an individual purchase order; thus, the duration of these contracts are for one year or less. The Company has made an accounting policy election to omit certain disclosures related to remaining performance obligations for contracts which have an initial term of one year or less.

When the Company performs shipping and handling activities after the transfer of control to the customer (e.g. when control transfers prior to delivery), they are considered fulfillment activities as opposed to separate performance obligations, and the Company recognizes revenue upon the transfer of control to the customer. Accordingly, the costs associated with these shipping and handling activities are accrued when the related revenue is recognized under the Company’s policy election. The Company expenses incremental costs of obtaining a contract as incurred if the expected amortization period of the asset that the Company would have recognized is one year or less. Sales, value added and other taxes the Company collects concurrent with revenue producing activities are excluded from revenues.

Fair Value Measurement

Restoration plan assets

The fair values of the Company’s restoration plan assets are determined through quoted prices in active markets. Restoration plan assets are assets held in a Rabbi trust to fund the obligations of the Company’s defined benefit supplementary retirement plans and include various stock and fixed income mutual funds. See Note 15 to these condensed consolidated financial statements regarding defined supplementary retirement plans. Unrealized gains and losses associated with the underlying stock and fixed income mutual funds were immaterial as of June 30, 2018 and December 31, 2017, respectively.

Derivative contracts

Derivative assets and liabilities can be exchange-traded or traded over-the-counter (“OTC”). The Company generally values exchange-traded derivatives using models that calibrate to market transactions and eliminate timing differences between the closing price of the exchange-traded derivatives and their underlying instruments. OTC derivatives are valued using market transactions and other market evidence whenever possible, including market-based inputs to models, model calibration to market transactions, broker or dealer quotations or alternative pricing sources with reasonable levels of price transparency. When models are used, the selection of a particular model to value an OTC derivative depends on the contractual terms of, and specific risks inherent in, the instrument as well as the availability of pricing information in the market. The Company generally uses similar models to value similar instruments. Valuation models require a variety of inputs, including contractual terms, market prices and rates, forward curves, measures of volatility, and correlations of such inputs. For OTC derivatives that trade in liquid markets, such as forward contracts, swaps and options, model inputs can generally be corroborated by observable market data by correlation or other means, and model selection does not involve significant management judgment.

The Company has interest rate caps, natural gas swaps and cross currency swaps that are fair valued using Level 2 inputs. In addition, the Company applies a credit valuation adjustment to reflect credit risk which is calculated based on credit default swaps. To the extent that the Company’s net exposure under a specific master agreement is an asset, the Company utilizes the counterparty’s default swap rate. If the net exposure under a specific master agreement is a liability, the Company utilizes a default swap rate comparable to PQ Group Holdings. The credit valuation adjustment is added to the discounted fair value to reflect the exit price that a market participant would be willing to receive to assume the Company’s liabilities or that a market participant would be willing to pay for the Company’s assets.

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Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The Company’s portfolio of products are integrated into a variety of end uses, which are described in the table below.

Key End Uses	Key Products
Industrial & process chemicals	• Silicate precursors for the tire industry
	• Glass beads, or microspheres, for metal finishing end uses
Fuels & emission control	• Refinery catalysts
	• Emission control catalysts
	• Catalyst recycling services
	• Silicate for catalyst manufacturing
Packaging & engineered plastics	• Catalysts for high-density polyethlene and chemicals syntheses
	• Antiblocks for film packaging
	• Solid and hollow microspheres for composite plastics
	• Sulfur derivatives for nylon production
Highway safety & construction	• Reflective markings for roadways and airports
	• Silica gels for surface coatings
Consumer products	• Silica gels for edible oil and beer clarification
	• Precipitated silicas, silicates and zeolites for the dentifrice and
	dishwasher and laundry detergent applications
Natural resources	• Silicates for drilling muds
	• Hollow glass beads, or microspheres, for oil well cements
	• Silicates and alum for water treatment mining
	• Bleaching aids for paper

The following tables disaggregate the Company’s sales, by segment and end use, for the three and six months months ended June 30, 2018:

	Three months ended June 30, 2018
	Environmental Catalysts & Services			Performance Materials & Chemicals		Total
Industrial & process chemicals	$	17,335		$	75,811	$	93,146
Fuels & emission control (1)	60,212			—		60,212
Packaging & engineered plastics	33,919			33,966		67,885
Highway safety & construction (1)	—			110,746		110,746
Consumer products	—			65,388		65,388
Natural resources	17,952			20,250		38,202
Total	129,418			306,161		435,579
Inter-segment sales eliminations	(866		)	—		(866		)
Total segment sales	$	128,552		$	306,161	$	434,713

	Six months ended June 30, 2018
	Environmental Catalysts & Services			Performance Materials & Chemicals		Total
Industrial & process chemicals	$	34,374		$	151,082	$	185,456
Fuels & emission control (1)	116,209			—		116,209
Packaging & engineered plastics	62,162			65,774		127,936
Highway safety & construction (1)	—			157,891		157,891
Consumer products	—			142,118		142,118
Natural resources	33,860			39,118		72,978
Total	246,605			555,983		802,588
Inter-segment sales eliminations	(1,678		)	—		(1,678		)
Total segment sales	$	244,927		$	555,983	$	800,910

⁽¹⁾ As described in Note 1, the Company experiences seasonal sales fluctuations to customers in the fuels & emission control and highway safety & construction end uses.

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring

The following table presents information about the Company’s assets and liabilities that were measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017, and indicates the fair value hierarchy of the valuation techniques the Company utilized to determine such fair value.

	June 30, 2018		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Derivative contracts	$	12,010	$	—	$	12,010	$	—
Restoration plan assets	4,962		4,962		—		—
Total	$	16,972	$	4,962	$	12,010	$	—
Liabilities:
Derivative contracts	$	196	$	—	$	196	$	—
Total	$	196	$	—	$	196	$	—

	December 31, 2017		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Derivative contracts	$	1,043	$	—	$	1,043	$	—
Restoration plan assets	5,576		5,576		—		—
Total	$	6,619	$	5,576	$	1,043	$	—
Liabilities:
Derivative contracts	$	448	$	—	$	448	$	—
Total	$	448	$	—	$	448	$	—

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Accumulated Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following tables present the tax effects of each component of other comprehensive income (loss) for the three and six months ended June 30, 2018 and 2017:

	Three months ended June 30,
	2018									2017
	Pre-tax amount			Tax benefit/(expense)			After-tax amount			Pre-tax amount			Tax benefit/(expense)			After-tax amount
Defined benefit and other postretirement plans:
Amortization and unrealized losses	$	1,833		$	(458	)	$	1,375		$	(34	)	$	12		$	(22	)
Benefit plans, net	1,833			(458		)	1,375			(34		)	12			(22		)
Net gain (loss) from hedging activities	737			(184		)	553			(2,025		)	769			(1,256		)
Foreign currency translation	(29,947		)	454			(29,493		)	30,612			(4,307		)	26,305
Other comprehensive income (loss)	$	(27,377	)	$	(188	)	$	(27,565	)	$	28,553		$	(3,526	)	$	25,027
	Six months ended June 30,
	2018									2017
	Pre-tax amount			Tax benefit/(expense)			After-tax amount			Pre-tax amount			Tax benefit/(expense)			After-tax amount
Defined benefit and other postretirement plans:
Amortization and unrealized losses	$	1,809		$	(452	)	$	1,357		$	(228	)	$	25		$	(203	)
Benefit plans, net	1,809			(452		)	1,357			(228		)	25			(203		)
Net gain (loss) from hedging activities	3,649			(913		)	2,736			(4,887		)	1,862			(3,025		)
Foreign currency translation	(19,833		)	(989		)	(20,822		)	47,859			(6,217		)	41,642
Other comprehensive income (loss)	$	(14,375	)	$	(2,354	)	$	(16,729	)	$	42,744		$	(4,330	)	$	38,414

The following table presents the change in accumulated other comprehensive income, net of tax, by component for the six months ended June 30, 2018 and 2017:

	Defined benefit and other postretirement plans			Net gain (loss) from hedging activities			Foreign currency translation			Total
December 31, 2017	$	7,412		$	967		$	(4,068	)	$	4,311
Other comprehensive income (loss) before reclassifications	1,387			2,613			(20,582		)	(16,582		)
Amounts reclassified from accumulated other comprehensive income(1)	(30		)	123			—			93
Net current period other comprehensive income (loss)	1,357			2,736			(20,582		)	(16,489		)
June 30, 2018	$	8,769		$	3,703		$	(24,650	)	$	(12,178	)
December 31, 2016	$	7,513		$	4,557		$	(65,781	)	$	(53,711	)
Other comprehensive income (loss) before reclassifications	(137		)	(3,038		)	41,141			37,966
Amounts reclassified from accumulated other comprehensive income(1)	(66		)	13			—			(53		)
Net current period other comprehensive income (loss)	(203		)	(3,025		)	41,141			37,913
June 30, 2017	$	7,310		$	1,532		$	(24,640	)	$	(15,798	)

⁽¹⁾  See the following table for details about these reclassifications. Amounts in parentheses indicate debits.

Reclassification out of Accumulated Other Comprehensive Income

The following table presents the reclassifications out of accumulated other comprehensive income for the three and six months ended June 30, 2018 and 2017.

Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income(a)												Affected Line Item in the Statements of Operations
	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Defined benefit and other postretirement plans
Amortization of prior service credit	$	(20	)	$	(20	)	$	(39	)	$	(39	)	(b)
Amortization of net (gain) loss	1			(19		)	3			(38		)	(b)
	(19		)	(39		)	(36		)	(77		)	Total before tax
	3			6			6			11			Tax expense (benefit)
	$	(16	)	$	(33	)	$	(30	)	$	(66	)	Net of tax
Net (gain) loss from hedging activities
Interest rate caps	$	58		$	9		$	93		$	11		Interest expense
Natural gas swaps	99			28			71			10			Cost of goods sold
	157			37			164			21			Total before tax
	(39		)	(8		)	(41		)	(8		)	Tax expense (benefit)
	$	118		$	29		$	123		$	13		Net of tax
Total reclassifications for the period	$	102		$	(4	)	$	93		$	(53	)	Net of tax

^(a)  Amounts in parentheses indicate credits to profit/loss.

^(b)  These accumulated other comprehensive income (loss) components are included in the computation of net periodic pension and other postretirement cost (see Note 15 to these condensed consolidated financial statements for additional details).

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Acquisition (Tables)

6 Months Ended

Jun. 30, 2018

Business Combinations [Abstract]

Preliminary Purchase Price Allocation

The following table sets forth the calculation and allocation of the purchase price to the identifiable net assets acquired with respect to the Acquisition, which was complete as of March 31, 2018.

	Provisional Purchase Price Allocation			Adjustments			Purchase Price Allocation
Total consideration, net of cash acquired	$	41,572		$	—		$	41,572
Recognized amounts of identifiable assets acquired and liabilities assumed:
Receivables	$	14,305		$	—		$	14,305
Inventories	7,645			1,603			9,248
Prepaid and other current assets	400			—			400
Property, plant and equipment	9,020			15,960			24,980
Other intangible assets	—			5,753			5,753
Other long-term assets	129			15,921			16,050
Fair value of assets acquired	31,499			39,237			70,736
Current debt	(6,420		)	—			(6,420		)
Accounts payable	(10,748		)	—			(10,748		)
Long-term debt	(10,189		)	—			(10,189		)
Deferred income taxes	—			(4,426		)	(4,426		)
Other long-term liabilities	(154		)	—			(154		)
Fair value of net assets acquired	3,988			34,811			38,799
Goodwill	37,584			(34,811		)	2,773
	$	41,572		$	—		$	41,572

Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination

The valuation of the intangible assets acquired and the related weighted-average amortization periods are as follows:

	Amount		Weighted-Average Expected Useful Life (in years)
Intangible assets subject to amortization:
Trademarks	$	1,767	11
Technical know-how	1,892		11
Total intangible assets subject to amortization	3,659
Trade names, not subject to amortization	2,094		Indefinite
Total	$	5,753

Business Acquisition, Pro Forma Information

Net sales and net income generated by the Sovitec legal entities included in the Company’s condensed consolidated statements of operations are as follows:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Net sales	$	19,326	$	3,704	$	30,247	$	3,704
Net income	2,585		503		814		503

	Unaudited
	Three months ended June 30, 2017			Six months ended June 30, 2017
Pro forma sales	$	397,251		$	738,625
Pro forma net loss	(2,629		)	(4,162		)
Pro forma net loss attributable to PQ Group Holdings Inc.	(2,568		)	(4,240		)
Pro forma basic and diluted net loss per share	$	(0.02	)	$	(0.04	)

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Goodwill (Tables)

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes in the carrying amount of goodwill for the six months ended June 30, 2018 is summarized as follows:

	Performance Materials & Chemicals			Environmental Catalysts & Services			Total
Balance as of December 31, 2017	$	914,623		$	391,333		$	1,305,956
Goodwill recognized	629			—			629
Goodwill adjustments(1)	(34,811		)	—			(34,811		)
Foreign exchange impact	(10,851		)	(637		)	(11,488		)
Balance as of June 30, 2018	$	869,590		$	390,696		$	1,260,286

⁽¹⁾  Represents the measurement period adjustments on the net assets acquired as part of the Acquisition (see Note 6 to these condensed consolidated financial statements for further information regarding the Acquisition).

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Other Operating Expense, Net (Tables)

6 Months Ended

Jun. 30, 2018

Other Income and Expenses [Abstract]

Schedule of Other Nonoperating Income (Expense)

A summary of other operating expense, net is as follows:

	Three months ended June 30,					Six months ended June 30,
	2018			2017		2018			2017
Amortization expense	$	8,744		$	8,290	$	17,693		$	14,124
Transaction and other related costs(1)	190			2,954		612			4,329
Restructuring and other related costs (Note 18)	10			276		130			1,472
Net loss on asset disposals(2)	4,752			2,577		5,904			2,925
Management advisory fees	—			1,250		—			2,500
Insurance proceeds(2)	(313		)	—		(1,557		)	—
Other, net	2,490			1,629		2,405			1,974
	$	15,873		$	16,976	$	25,187		$	27,324

⁽¹⁾  Transaction and other related costs for the three and six months ended June 30, 2018 and 2017 primarily include transaction costs associated with the Company’s initial public offering (exclusive of the direct costs recorded in stockholders’ equity net of the proceeds from the offering) and the Acquisition (see Note 6 to these condensed consolidated financial statements for further information).

⁽²⁾  During the three and six months ended June 30, 2018, the Company recognized $1,000 and $2,500, respectively, of insurance proceeds in its condensed consolidated statement of operations related to the Company’s claim for losses sustained during Hurricane Harvey in August 2017. For the three months ended June 30, 2018, $264 was recorded as a gain in other operating expense, net, as reimbursement of expenses, while the remaining $736 represented proceeds in excess of the Company’s property losses which was recorded as a non-operating gain in other expense, net, in the Company’s consolidated statement of operations. For the six months endedJune 30, 2018, $1,557 was recorded as a gain in other operating expense, net, as reimbursement of expenses, $207 was recorded as a gain in net loss on asset disposals within other operating expense, net, for the Company’s previously recognized property losses, and $736 represented proceeds in excess of the Company’s property losses which was recorded as a non-operating gain in other expense, net, in the Company’s consolidated statement of operations.

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Inventories (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory, Current

Inventories are classified and valued as follows:

	June 30, 2018		December 31, 2017
Finished products and work in process	$	203,701	$	199,919
Raw materials	64,712		62,469
	$	268,413	$	262,388
Valued at lower of cost or market:
LIFO basis	$	168,256	$	162,315
Valued at lower of cost and net realizable value:
FIFO or average cost basis	100,157		100,073
	$	268,413	$	262,388

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Investments in Affiliated Companies (Tables)

6 Months Ended

Jun. 30, 2018

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments

The Company accounts for investments in affiliated companies under the equity method. Affiliated companies accounted for on the equity basis as of June 30, 2018 are as follows:

Company	Country	Percent Ownership
PQ Silicates Ltd.	Taiwan	50%
Zeolyst International	USA	50%
Zeolyst C.V.	Netherlands	50%
Quaker Holdings	South Africa	49%

Following is summarized information of the combined investments⁽¹⁾:    

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Net sales	$	108,898	$	68,732	$	197,474	$	141,787
Gross profit	40,669		29,661		76,191		58,586
Operating income	31,622		19,112		57,663		37,695
Net income	30,638		20,809		57,660		39,844

⁽¹⁾  Summarized information of the combined investments is presented at 100%; the Company’s share of the net assets and net income of affiliates is calculated based on the percent ownership specified in the table above.

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Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

A summary of property, plant and equipment, at cost, and related accumulated depreciation is as follows:

	June 30, 2018			December 31, 2017
Land	$	192,017		$	191,006
Buildings	209,672			200,054
Machinery and equipment	1,063,438			1,005,025
Construction in progress	121,157			145,414
	1,586,284			1,541,499
Less: accumulated depreciation	(369,282		)	(311,115		)
	$	1,217,002		$	1,230,384

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Long-term Debt (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

The summary of long-term debt is as follows:

	June 30, 2018			December 31, 2017
Term Loan Facility (U.S. dollar denominated)	$	—		$	916,153
Term Loan Facility (Euro denominated)	—			335,808
New Term Loan Facility	1,260,665			—
6.75% Senior Secured Notes due 2022	625,000			625,000
5.75% Senior Unsecured Notes due 2025	300,000			300,000
ABL Facility	32,000			25,000
Other	69,990			68,318
Total debt	2,287,655			2,270,279
Original issue discount	(21,409		)	(18,390		)
Deferred financing costs	(18,406		)	(21,403		)
Total debt, net of original issue discount and deferred financing costs	2,247,840			2,230,486
Less: current portion	(54,071		)	(45,166		)
Total long-term debt, excluding current portion	$	2,193,769		$	2,185,320

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Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value of Derivatives Held

The fair values of derivative instruments held as of June 30, 2018 and December 31, 2017 are shown below:

	Balance sheet location	June 30, 2018		December 31, 2017
Derivative assets:
Derivatives designated as cash flow hedges:
Natural gas swaps	Prepaid and other current assets	$	2	$	—
Interest rate caps	Prepaid and other current assets	1,208		$	44
Interest rate caps	Other long-term assets	3,139		999
		4,349		1,043
Derivatives designed as net investment hedges:
Cross currency swaps	Prepaid and other current assets	5,367		—
Cross currency swaps	Other long-term assets	2,294		—
		7,661		—
Total derivative assets		$	12,010	$	1,043
Derivative liabilities:
Derivatives designated as cash flow hedges:
Natural gas swaps	Accrued liabilities	$	25	$	318
Natural gas swaps	Other long-term liabilities	171		130
Total derivative liabilities		$	196	$	448

Effect of Derivative Instruments Designated as Hedges on Other Comprehensive Income

The following tables show the effect of the Company’s derivative instruments designated as cash flow hedges on accumulated other comprehensive income (“AOCI”) for the three and six months ended June 30, 2018 and 2017:

		Three months ended June 30,
		2018					2017
	Location of gain (loss) reclassified from AOCI into income	Amount of gain (loss) recognized in OCI on derivatives		Amount of gain (loss) reclassified from AOCI into income			Amount of gain (loss) recognized in OCI on derivatives			Amount of gain (loss) reclassified from AOCI into income
Interest rate caps	Interest (expense) income	$	451	$	(58	)	$	(1,839	)	$	(9	)
Natural gas swaps	Cost of goods sold	129		(99		)	(224		)	(28		)
		$	580	$	(157	)	$	(2,063	)	$	(37	)
		Six months ended June 30,
		2018					2017
	Location of gain (loss) reclassified from AOCI into income	Amount of gain (loss) recognized in OCI on derivatives		Amount of gain (loss) reclassified from accumulated OCI into income			Amount of gain (loss) recognized in OCI on derivatives			Amount of gain (loss) reclassified from AOCI into income
Interest rate caps	Interest (expense) income	$	3,303	$	(93	)	$	(4,150	)	$	(11	)
Natural gas swaps	Cost of goods sold	182		(71		)	(759		)	(10		)
		$	3,485	$	(164	)	$	(4,909	)	$	(21	)

Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)

The following tables show the effect of the Company’s cash flow hedge accounting on the condensed consolidated statements of operations for the three and six months ended June 30, 2018 and 2017:

	Location and amount of gain (loss) recognized in income on cash flow hedging relationships
	Three months ended June 30,
	2018						2017
	Cost of goods sold			Interest (expense) income			Cost of goods sold			Interest (expense) income
Total amounts of income and expense line items presented in the statement of operations in which the effects of cash flow hedges are recorded	$	(326,309	)	$	(27,221	)	$	(281,853	)	$	(48,176	)
The effects of cash flow hedging:
Gain (loss) on cash flow hedging relationships:
Interest contracts:
Amount of gain (loss) reclassified from AOCI into income	—			(58		)	—			(9		)
Commodity contracts:
Amount of gain (loss) reclassified from AOCI into income	(99		)	—			(28		)	—

	Location and amount of gain (loss) recognized in income on cash flow hedging relationships
	Six months ended June 30,
	2018				2017
	Cost of goods sold		Interest (expense) income		Cost of goods sold		Interest (expense) income
Total amounts of income and expense line items presented in the statement of operations in which the effects of cash flow hedges are recorded	(614,385	)	(56,384	)	(532,072	)	(94,961	)
The effects of cash flow hedging:
Gain (loss) on cash flow hedging relationships:
Interest contracts:
Amount of gain (loss) reclassified from AOCI into income	—		(93	)	—		(11	)
Commodity contracts:
Amount of gain (loss) reclassified from AOCI into income	(71	)	—		(10	)	—

Schedule of Net Investment Hedges in Accumulated Other Comprehensive Income (Loss)

The following tables show the effect of the Company’s net investment hedges on AOCI and the condensed consolidated statements of operations for the three and six months ended June 30, 2018 and 2017:

	Amount of gain (loss) recognized in OCI on derivative				Location of gain (loss) reclassified from AOCI into income	Amount of gain (loss) reclassified from AOCI into income				Location of gain (loss) recognized in income on derivative (amount excluded from effectiveness testing)	Amount of gain (loss) recognized in income on derivative (amount excluded from effectiveness testing)
	Three months ended June 30,					Three months ended June 30,					Three months ended June 30,
	2018		2017			2018		2017			2018		2017
Cross currency swaps	$	16,937	$	—	Gain (loss) on sale of subsidiary	$	—	$	—	Interest (expense) income	$	2,224	$	—

	Amount of gain (loss) recognized in OCI on derivative				Location of gain (loss) reclassified from AOCI into income	Amount of gain (loss) reclassified from AOCI into income				Location of gain (loss) recognized in income on derivative (amount excluded from effectiveness testing)	Amount of gain (loss) recognized in income on derivative (amount excluded from effectiveness testing)
	Six months ended June 30,					Six months ended June 30,					Six months ended June 30,
	2018		2017			2018		2017			2018		2017
Cross currency swaps	$	7,661	$	—	Gain (loss) on sale of subsidiary	$	—	$	—	Interest (expense) income	$	3,391	$	—

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Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2018

Defined Benefit Pension Plans

Defined Benefit Plan Disclosure

Components of Net Periodic Expense

Components of net periodic expense (benefit) are as follows:

Defined Benefit Pension Plans

	U.S.						Foreign
	Three months ended June 30,						Three months ended June 30,
	2018			2017			2018			2017
Service cost	$	223		$	304		$	845		$	941
Interest cost	2,369			2,536			1,608			1,254
Expected return on plan assets	(3,176		)	(3,061		)	(1,628		)	(923		)
Amortization of net loss	—			—			12			—
Curtailment gain recognized	(576		)	—			—			—
Net periodic expense (benefit)	$	(1,160	)	$	(221	)	$	837		$	1,272
	U.S.						Foreign
	Six months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Service cost	$	533		$	609		$	1,732		$	1,783
Interest cost	4,741			5,072			3,113			2,685
Expected return on plan assets	(6,350		)	(6,122		)	(2,947		)	(2,217		)
Amortization of net less	—			—			25			—
Curtailment gain recognized	(576		)	—			—			—
Net periodic expense (benefit)	$	(1,652	)	$	(441	)	$	1,923		$	2,251

Supplemental Retirement Plans

Defined Benefit Plan Disclosure

Components of Net Periodic Expense

Supplemental Retirement Plans

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Interest cost	$	110	$	123	$	220	$	246
Net periodic expense	$	110	$	123	$	220	$	246

Other Postretirement Benefits Plans

Defined Benefit Plan Disclosure

Components of Net Periodic Expense

Other Postretirement Benefit Plans

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Service cost	$	3		$	5		$	9		$	10
Interest cost	27			41			65			81
Amortization of prior service credit	(20		)	(20		)	(39		)	(39		)
Amortization of net gain	(11		)	(19		)	(22		)	(38		)
Net periodic expense (benefit)	$	(1	)	$	7		$	13		$	14

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Reportable Segments (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Reconciliation of Revenue from Reportable Segments to Consolidated

Summarized financial information for the Company’s (1) Environmental Catalysts & Services and (2) Performance Materials & Chemicals reportable segments is shown in the following table:

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Net sales:
Silica Catalysts	$	17,347		$	20,045		$	33,820		$	37,185
Refining Services	112,071			103,947			212,785			198,088
Environmental Catalysts & Services(1)	129,418			123,992			246,605			235,273
Performance Chemicals	183,761			169,038			373,724			339,987
Performance Materials	126,538			99,470			189,280			153,243
Eliminations	(4,138		)	(2,404		)	(7,021		)	(4,521		)
Performance Materials & Chemicals	306,161			266,104			555,983			488,709
Inter-segment sales eliminations(2)	(866		)	(829		)	(1,678		)	(1,784		)
Total	$	434,713		$	389,267		$	800,910		$	722,198
Segment Adjusted EBITDA:(3)
Environmental Catalysts & Services(4)	$	64,864		$	64,311		$	123,285		$	120,678
Performance Materials & Chemicals	73,389			66,333			130,541			118,856
Total Segment Adjusted EBITDA(5)	$	138,253		$	130,644		$	253,826		$	239,534

⁽¹⁾ Excludes the Company’s proportionate share of sales from the Zeolyst International and Zeolyst C.V. joint ventures (collectively, the “Zeolyst Joint Venture”) accounted for using the equity method (see Note 10 to these condensed consolidated financial statements for further information). The proportionate share of sales is $49,513 and $30,661 for the three months ended June 30, 2018 and 2017, respectively. The proportionate share of sales is $87,862 and $63,369 for the six months ended June 30, 2018 and 2017, respectively.

⁽²⁾ The Company eliminates intersegment sales when reconciling to the Company’s consolidated statements of operations.

⁽³⁾ The Company defines Adjusted EBITDA as EBITDA adjusted for certain items as noted in the reconciliation below. Management evaluates the performance of its segments and allocates resources based on several factors, of which the primary measure is Adjusted EBITDA. Adjusted EBITDA should not be considered as an alternative to net income as an indicator of the Company’s operating performance. Adjusted EBITDA as defined by the Company may not be comparable with EBITDA or Adjusted EBITDA as defined by other companies.

⁽⁴⁾ The Adjusted EBITDA from the Zeolyst Joint Venture included in the Environmental Catalysts and Services segment is $17,874 for the three months ended June 30, 2018, which includes $13,616 of equity in net income plus $1,659 of amortization of investment in affiliate step-up plus $2,599 of joint venture depreciation, amortization and interest. The Adjusted EBITDA from the Zeolyst Joint Venture included in the Environmental Catalysts and Services segment is $13,205 for the three months ended June 30, 2017, which includes $8,675 of equity in net income plus $1,659 of amortization of investment in affiliate step-up plus $2,871 of joint venture depreciation, amortization and interest.

The Adjusted EBITDA from the Zeolyst Joint Venture included in the Environmental Catalysts and Services segment is $34,681 for the six months ended June 30, 2018, which includes $25,442 of equity in net income plus $3,317 of amortization of investment in affiliate step-up plus $5,922 of joint venture depreciation, amortization and interest. The Adjusted EBITDA from the Zeolyst Joint Venture included in the Environmental Catalysts and Services segment is $25,292 for the six months ended June 30, 2017, which includes $14,499 of equity in net income plus $5,283 of amortization of investment in affiliate step-up plus $5,510 of joint venture depreciation, amortization and interest.

⁽⁵⁾ Total Segment Adjusted EBITDA differs from the Company’s consolidated Adjusted EBITDA due to unallocated corporate expenses.

Reconciliation of Net Loss to Segment Adjusted EBITDA

A reconciliation of net income (loss) attributable to PQ Group Holdings to Segment Adjusted EBITDA is as follows:

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018		2017
Reconciliation of net income (loss) attributable to PQ Group Holdings Inc. to Segment Adjusted EBITDA
Net income (loss) attributable to PQ Group Holdings Inc.	$	15,782		$	(1,609	)	$	15,996	$	(4,063	)
Provision for income taxes	13,649			3,007			13,120		97
Interest expense, net	27,221			48,176			56,384		94,961
Depreciation and amortization	46,983			42,620			95,471		83,206
Segment EBITDA	103,635			92,194			180,971		174,201
Unallocated corporate expenses	9,358			7,882			17,046		15,589
Joint venture depreciation, amortization and interest	2,599			2,871			5,922		5,510
Amortization of investment in affiliate step-up	1,659			1,658			3,317		5,282
Amortization of inventory step-up	—			—			1,603		871
Debt extinguishment costs	—			—			5,879		—
Net loss on asset disposals	4,752			2,577			5,904		2,925
Foreign currency exchange loss	6,757			14,370			11,820		16,356
Non-cash revaluation of inventory, including LIFO	121			—			5,047		2,479
Management advisory fees	—			1,250			—		2,500
Transaction and other related costs	257			2,955			685		4,334
Equity-based and other non-cash compensation	3,796			1,176			7,627		2,828
Restructuring, integration and business optimization expenses	2,405			1,351			3,484		3,052
Defined benefit pension plan cost	(402		)	685			148		1,409
Other	3,316			1,675			4,373		2,198
Segment Adjusted EBITDA	$	138,253		$	130,644		$	253,826	$	239,534

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Restructuring and Other Related Costs (Tables)

6 Months Ended

Jun. 30, 2018

Restructuring and Related Activities [Abstract]

Components of Restructuring and Other Related Costs

The following table presents the components of restructuring and other related costs for the three and six months ended June 30, 2018 and 2017 included in other operating expense, net in the accompanying condensed consolidated statements of operations:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Severance and other employee costs related to legacy Eco restructuring plan	$	—	$	—	$	—	$	830
Severance and other employee costs related to performance materials plant closure	—		—		107		—
Other related costs	10		276		23		642
	$	10	$	276	$	130	$	1,472

Activity in Restructuring Plan

The activity in the accrued liability balance associated with the Company’s restructuring plans, all of which related to severance and other employee costs, was as follows for the six months ended June 30, 2018:

	Legacy Eco Restructuring Plan			Performance Materials Plant Closure			Total Restructuring Charges
Balance at December 31, 2017	$	215		$	3,123		$	3,338
Restructuring charges	—			107			107
Cash payments	(192		)	(1,924		)	(2,116		)
Foreign exchange impact	—			(7		)	(7		)
Balance at June 30, 2018	$	23		$	1,299		$	1,322

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Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Schedule of from Basic to Diluted Weighted Average Number of Shares Outstanding

The reconciliation from basic to diluted weighted average shares outstanding is as follows:

	Three months ended June 30,		Six months ended June 30,
	2018	2017	2018	2017
Weighted average shares outstanding – Basic	133,222,463	104,015,815	133,188,303	103,981,851
Dilutive effect of unvested common shares and restricted stock units with service conditions and assumed stock option exercises and conversions	987,277	—	859,059	—
Weighted average shares outstanding – Diluted	134,209,740	104,015,815	134,047,362	103,981,851

Schedule of Earnings Per Share, Basic and Diluted

Basic and diluted earnings per share are calculated as follows:

	Three months ended June 30,					Six months ended June 30,
	2018		2017			2018		2017
Numerator:
Net income (loss) attributable to PQ Group Holdings Inc.	$	15,782	$	(1,609	)	$	15,996	$	(4,063	)
Denominator:
Weighted average shares outstanding – Basic	133,222,463		104,015,815			133,188,303		103,981,851
Weighted average shares outstanding – Diluted	134,209,740		104,015,815			134,047,362		103,981,851
Net income (loss) per share:
Basic income (loss) per share	$	0.12	$	(0.02	)	$	0.12	$	(0.04	)
Diluted income (loss) per share	$	0.12	$	(0.02	)	$	0.12	$	(0.04	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The table below presents the details of the Company’s equity-based awards outstanding at the end of each respective period that were excluded from the calculation of diluted earnings per share:

	June 30,
	2018	2017
Restricted stock awards with performance only targets not yet achieved	1,659,050	1,769,447
Stock options with performance only targets not yet achieved	586,253	651,255
Anti-dilutive restricted stock awards and restricted stock units	—	341,880
Anti-dilutive stock options	621,747	1,539,266

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Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

The following table presents supplemental cash flow information for the Company:

	Six months ended June 30,
	2018		2017
Cash paid during the period for:
Income taxes	$	11,053	$	15,904
Interest	60,210		91,710
Non-cash investing activity:
Capital expenditures acquired on account but unpaid as of the period end	11,875		11,681

Schedule of Cash and Cash Equivalents

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the unaudited condensed consolidated balance sheets as of June 30, 2018 and 2017 to the total of the same amounts shown in the unaudited condensed consolidated statements of cash flows for the six months then ended:

	June 30,
	2018		2017
Cash and cash equivalents	$	52,553	$	50,457
Restricted cash included in prepaid and other current assets	1,332		4,976
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	$	53,885	$	55,433

Restrictions on Cash and Cash Equivalents

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the unaudited condensed consolidated balance sheets as of June 30, 2018 and 2017 to the total of the same amounts shown in the unaudited condensed consolidated statements of cash flows for the six months then ended:

	June 30,
	2018		2017
Cash and cash equivalents	$	52,553	$	50,457
Restricted cash included in prepaid and other current assets	1,332		4,976
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	$	53,885	$	55,433

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Background and Basis of Presentation (Details)	6 Months Ended
	Jun. 30, 2018 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	2

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New Accounting Standards (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounting Changes and Error Corrections [Abstract]
Pension benefit included in other (income) expense, net	$ 1,285	$ 69	$ 1,770	$ 332
Restricted cash	$ 1,332	$ 4,976	$ 1,332	$ 4,976

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Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue
Sales	$ 434,713	$ 389,267	$ 800,910	$ 722,198
Environmental Catalysts & Services
Disaggregation of Revenue
Sales	128,552		244,927
Performance Materials & Chemicals
Disaggregation of Revenue
Sales	306,161		555,983
Operating segments
Disaggregation of Revenue
Sales	435,579		802,588
Operating segments | Industrial & process chemicals
Disaggregation of Revenue
Sales	93,146		185,456
Operating segments | Fuels & emission control
Disaggregation of Revenue
Sales	60,212		116,209
Operating segments | Packaging & engineered plastics
Disaggregation of Revenue
Sales	67,885		127,936
Operating segments | Highway safety & construction
Disaggregation of Revenue
Sales	110,746		157,891
Operating segments | Consumer products
Disaggregation of Revenue
Sales	65,388		142,118
Operating segments | Natural resources
Disaggregation of Revenue
Sales	38,202		72,978
Operating segments | Environmental Catalysts & Services
Disaggregation of Revenue
Sales	129,418		246,605
Operating segments | Environmental Catalysts & Services | Industrial & process chemicals
Disaggregation of Revenue
Sales	17,335		34,374
Operating segments | Environmental Catalysts & Services | Fuels & emission control
Disaggregation of Revenue
Sales	60,212		116,209
Operating segments | Environmental Catalysts & Services | Packaging & engineered plastics
Disaggregation of Revenue
Sales	33,919		62,162
Operating segments | Environmental Catalysts & Services | Highway safety & construction
Disaggregation of Revenue
Sales	0		0
Operating segments | Environmental Catalysts & Services | Consumer products
Disaggregation of Revenue
Sales	0		0
Operating segments | Environmental Catalysts & Services | Natural resources
Disaggregation of Revenue
Sales	17,952		33,860
Operating segments | Performance Materials & Chemicals
Disaggregation of Revenue
Sales	306,161		555,983
Operating segments | Performance Materials & Chemicals | Industrial & process chemicals
Disaggregation of Revenue
Sales	75,811		151,082
Operating segments | Performance Materials & Chemicals | Fuels & emission control
Disaggregation of Revenue
Sales	0		0
Operating segments | Performance Materials & Chemicals | Packaging & engineered plastics
Disaggregation of Revenue
Sales	33,966		65,774
Operating segments | Performance Materials & Chemicals | Highway safety & construction
Disaggregation of Revenue
Sales	110,746		157,891
Operating segments | Performance Materials & Chemicals | Consumer products
Disaggregation of Revenue
Sales	65,388		142,118
Operating segments | Performance Materials & Chemicals | Natural resources
Disaggregation of Revenue
Sales	20,250		39,118
Inter-segment sales eliminations
Disaggregation of Revenue
Sales	(866)		(1,678)
Inter-segment sales eliminations | Environmental Catalysts & Services
Disaggregation of Revenue
Sales	(866)		(1,678)
Inter-segment sales eliminations | Performance Materials & Chemicals
Disaggregation of Revenue
Sales	$ 0		$ 0

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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets:
Derivative contracts	$ 12,010	$ 1,043
Restoration plan assets	4,962	5,576
Total	16,972	6,619
Liabilities:
Derivative contracts	196	448
Total	196	448
Quoted Prices in Active Markets (Level 1)
Assets:
Derivative contracts	0	0
Restoration plan assets	4,962	5,576
Total	4,962	5,576
Liabilities:
Derivative contracts	0	0
Total	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Derivative contracts	12,010	1,043
Restoration plan assets	0	0
Total	12,010	1,043
Liabilities:
Derivative contracts	196	448
Total	196	448
Significant Unobservable Inputs (Level 3)
Assets:
Derivative contracts	0	0
Restoration plan assets	0	0
Total	0	0
Liabilities:
Derivative contracts	0	0
Total	$ 0	$ 0

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Accumulated Other Comprehensive Income - Pre-tax and After-tax Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
After-tax amount
Pre-tax amount	$ (27,377)	$ 28,553	$ (14,375)	$ 42,744
Tax benefit/(expense)	(188)	(3,526)	(2,354)	(4,330)
Total other comprehensive income (loss)	(27,565)	25,027	(16,729)	38,414
Defined benefit and other postretirement plans:
After-tax amount
Pre-tax amount	1,833	(34)	1,809	(228)
Tax benefit/(expense)	(458)	12	(452)	25
Total other comprehensive income (loss)	1,375	(22)	1,357	(203)
Net gain (loss) from hedging activities
After-tax amount
Pre-tax amount	737	(2,025)	3,649	(4,887)
Tax benefit/(expense)	(184)	769	(913)	1,862
Total other comprehensive income (loss)	553	(1,256)	2,736	(3,025)
Foreign currency translation
After-tax amount
Pre-tax amount	(29,947)	30,612	(19,833)	47,859
Tax benefit/(expense)	454	(4,307)	(989)	(6,217)
Total other comprehensive income (loss)	$ (29,493)	$ 26,305	$ (20,822)	$ 41,642

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Accumulated Other Comprehensive Income - Change by Component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance			$ 1,631,919	$ 1,027,944
Amounts reclassified from accumulated other comprehensive income	$ 102	$ (4)	93	(53)
Total other comprehensive income (loss)	(27,565)	25,027	(16,729)	38,414
Ending balance	1,639,328	1,064,416	1,639,328	1,064,416
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance			4,311	(53,711)
Other comprehensive income (loss) before reclassifications			(16,582)	37,966
Amounts reclassified from accumulated other comprehensive income			93	(53)
Total other comprehensive income (loss)			(16,489)	37,913
Ending balance	(12,178)	(15,798)	(12,178)	(15,798)
Defined benefit and other postretirement plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance			7,412	7,513
Other comprehensive income (loss) before reclassifications			1,387	(137)
Amounts reclassified from accumulated other comprehensive income	(16)	(33)	(30)	(66)
Total other comprehensive income (loss)			1,357	(203)
Ending balance	8,769	7,310	8,769	7,310
Net gain (loss) from hedging activities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance			967	4,557
Other comprehensive income (loss) before reclassifications			2,613	(3,038)
Amounts reclassified from accumulated other comprehensive income			123	13
Total other comprehensive income (loss)			2,736	(3,025)
Ending balance	3,703	1,532	3,703	1,532
Foreign currency translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance			(4,068)	(65,781)
Other comprehensive income (loss) before reclassifications			(20,582)	41,141
Amounts reclassified from accumulated other comprehensive income			0	0
Total other comprehensive income (loss)			(20,582)	41,141
Ending balance	$ (24,650)	$ (24,640)	$ (24,650)	$ (24,640)

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Accumulated Other Comprehensive Income - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification, net	$ 102	$ (4)	$ 93	$ (53)
Interest expense, net	27,221	48,176	56,384	94,961
Cost of goods sold	326,309	281,853	614,385	532,072
Income (loss) before income taxes and noncontrolling interest	(29,808)	(1,337)	(29,835)	3,888
Tax expense (benefit)	13,649	3,007	13,120	97
Net loss	(16,159)	1,670	(16,715)	3,985
Defined benefit and other postretirement plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification, before tax	(19)	(39)	(36)	(77)
Reclassification, tax	3	6	6	11
Reclassification, net	(16)	(33)	(30)	(66)
Amortization of prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification, before tax	(20)	(20)	(39)	(39)
Amortization of net (gain) loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification, before tax	1	(19)	3	(38)
Net gain (loss) from hedging activities | Amount of gain (loss) reclassified from AOCI into income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income taxes and noncontrolling interest	157	37	164	21
Tax expense (benefit)	(39)	(8)	(41)	(8)
Net loss	118	29	123	13
Net gain (loss) from hedging activities | Amount of gain (loss) reclassified from AOCI into income | Interest rate caps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net	58	9	93	11
Net gain (loss) from hedging activities | Amount of gain (loss) reclassified from AOCI into income | Natural gas swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	$ 99	$ 28	$ 71	$ 10

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Acquisition - Allocation of Purchase Price (Details) - USD ($) $ in Thousands		6 Months Ended		13 Months Ended
	Jun. 12, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Business Acquisition
Total consideration, net of cash acquired		$ 1,006	$ 41,572
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill		1,260,286		$ 1,260,286	$ 1,305,956
Sovitec Mondial S.A.
Business Acquisition
Total consideration, net of cash acquired	$ 41,572	41,572
Measurement Period Adjustments, Total consideration, net of cash acquired				0
Recognized amounts of identifiable assets acquired and liabilities assumed:
Receivables	14,305	14,305		14,305
Measurement Period Adjustments, Receivables				0
Inventories	7,645	9,248		9,248
Measurement Period Adjustments, Inventories				1,603
Prepaid and other current assets	400	400		400
Measurement Period Adjustments, Prepaids and other current assets				0
Property, plant and equipment	9,020	24,980		24,980
Measurement Period Adjustments, Property, plant and equipment				15,960
Other intangible assets	0	5,753		5,753
Measurement Period Adjustments, Other intangible assets				5,753
Other long-term assets	129	16,050		16,050
Measurement Period Adjustments, other long-term assets				15,921
Fair value of assets acquired	31,499	70,736		70,736
Measurement Period Adjustments, fair value of assets acquired				39,237
Current debt	(6,420)	(6,420)		(6,420)
Measurement Period Adjustments, Current debt				0
Accounts payable	(10,748)	(10,748)		(10,748)
Measurement Period Adjustments, Accounts payable				0
Long-term debt	(10,189)	(10,189)		(10,189)
Measurement Period Adjustments, Long-term liabilities				0
Deferred income taxes	0	(4,426)		(4,426)
Measurement Period Adjustments, Deferred income taxes				(4,426)
Other long-term liabilities	(154)	(154)		(154)
Measurement Period Adjustments, Other long-term liabilities				0
Fair value of net assets acquired	3,988	38,799		38,799
Measurement Period Adjustments, Fair value of net assets acquired				34,811
Goodwill	37,584	2,773		2,773
Measurement Period Adjustments, Goodwill				(34,811)
Net assets including goodwill acquired	$ 41,572	$ 41,572		41,572
Measurement Period Adjustments, Net assets including goodwill				$ 0

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Acquisition - Narratives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 12, 2017
Business Acquisition
Transaction and other related costs	$ 190	$ 2,954	$ 612	$ 4,329
Net income (loss)	(15,782)	1,609	(15,996)	4,063
Sovitec Mondial S.A.
Business Acquisition
Gross contract receivable					$ 14,607
Uncollectable gross contract receivable					$ 302
Measurement period adjustments, depreciation			421
Measurement period adjustments, tax benefit			990
Transaction and other related costs	$ 0	454	0	1,328
Cost of Goods Sold | Sovitec Mondial S.A.
Business Acquisition
Measurement period adjustments, amortization			108
Other Expense, Net | Sovitec Mondial S.A.
Business Acquisition
Measurement period adjustments, amortization			$ 101
Transaction Fee Charges
Business Acquisition
Net income (loss)		454		1,328
Intangible Assets Fair Value Adjustment
Business Acquisition
Net income (loss)		90		176
Property, Plant, and Equipment Fair Value Adjustment
Business Acquisition
Net income (loss)		$ 149		$ 353

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Acquisition - Intangible Assets Acquired (Details) - Sovitec Mondial S.A. - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 12, 2017
Business Acquisition
Total intangible assets subject to amortization	$ 3,659
Total	5,753	$ 0
Trade names
Business Acquisition
Trade names, not subject to amortization	2,094
Trademarks
Business Acquisition
Total intangible assets subject to amortization	$ 1,767
Weighted-Average Expected Useful Life (in years)	11 years
Technical know-how
Business Acquisition
Total intangible assets subject to amortization	$ 1,892
Weighted-Average Expected Useful Life (in years)	11 years

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Acquisition - Pro Forma Disclosure (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition
Pro forma sales		$ 397,251		$ 738,625
Pro forma net loss		(2,629)		(4,162)
Pro forma net loss attributable to PQ Group Holdings Inc.		$ (2,568)		$ (4,240)
Pro forma basic and diluted net loss per share (usd per share)		$ (0.02)		$ (0.04)
Sovitec Mondial S.A.
Business Acquisition
Pro forma sales	$ 19,326	$ 3,704	$ 30,247	$ 3,704
Net income	$ 2,585	$ 503	$ 814	$ 503

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Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Goodwill
Beginning balance	$ 1,305,956
Goodwill recognized	629
Goodwill adjustments	(34,811)
Foreign exchange impact	(11,488)
Ending balance	1,260,286
Performance Materials & Chemicals
Goodwill
Beginning balance	914,623
Goodwill recognized	629
Goodwill adjustments	(34,811)
Foreign exchange impact	(10,851)
Ending balance	869,590
Environmental Catalysts & Services
Goodwill
Beginning balance	391,333
Goodwill recognized	0
Goodwill adjustments	0
Foreign exchange impact	(637)
Ending balance	$ 390,696

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Other Operating Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Income and Expenses [Abstract]
Amortization expense	$ 8,744	$ 8,290	$ 17,693	$ 14,124
Transaction and other related costs	190	2,954	612	4,329
Restructuring and other related costs (Note 18)	10	276	130	1,472
Net loss on asset disposals	4,752	2,577	5,904	2,925
Management advisory fees	0	1,250	0	2,500
Insurance proceeds	(313)	0	(1,557)	0
Other, net	2,490	1,629	2,405	1,974
Other operating expense, net	15,873	$ 16,976	25,187	$ 27,324
Proceeds from insurance settlement	1,000		2,500
Reimbursement revenue recorded in other operating expenses	264		207
Proceeds from reimbursement categorized as non operating income	$ 736		$ 736

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Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Inventory, Net
Finished products and work in process	$ 203,701	$ 199,919
Raw materials	64,712	62,469
Inventory, Net	268,413	262,388
Valued at lower of cost or market:
LIFO basis	168,256	162,315
FIFO or average cost basis	100,157	100,073
Inventory, Net	$ 268,413	$ 262,388

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Investments in Affiliated Companies - Ownership Percentage (Details)	Jun. 30, 2018
PQ Silicates Ltd.
Schedule of Equity Method Investments
Ownership percentage	50.00%
Zeolyst International
Schedule of Equity Method Investments
Ownership percentage	50.00%
Zeolyst C.V.
Schedule of Equity Method Investments
Ownership percentage	50.00%
Quaker Holdings
Schedule of Equity Method Investments
Ownership percentage	49.00%

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Investments in Affiliated Companies - Summarized Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Equity Method Investment, Summarized Financial Information
Net sales	$ 108,898	$ 68,732	$ 197,474	$ 141,787
Gross profit	40,669	29,661	76,191	58,586
Operating income	31,622	19,112	57,663	37,695
Net income	$ 30,638	$ 20,809	$ 57,660	$ 39,844

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Investments in Affiliated Companies - Narratives (Details) - Business Combination - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Business Acquisition
Purchase accounting fair value adjustments			$ 261,384		$ 264,700
Charges related to purchase accounting fair value adjustments	$ 1,658	$ 1,658	$ 3,316	$ 5,282

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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment
Property, plant and equipment, gross	$ 1,586,284	$ 1,541,499
Less: accumulated depreciation	(369,282)	(311,115)
Property, plant and equipment, net	1,217,002	1,230,384
Land
Property, Plant and Equipment
Property, plant and equipment, gross	192,017	191,006
Buildings
Property, Plant and Equipment
Property, plant and equipment, gross	209,672	200,054
Machinery and equipment
Property, Plant and Equipment
Property, plant and equipment, gross	1,063,438	1,005,025
Construction in progress
Property, Plant and Equipment
Property, plant and equipment, gross	$ 121,157	$ 145,414

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Property, Plant and Equipment - Narratives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Depreciation	$ 33,962	$ 29,841	$ 68,865	$ 58,030

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Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument
Total debt	$ 2,287,655	$ 2,270,279
Original issue discount	(21,409)	(18,390)
Deferred financing costs	(18,406)	(21,403)
Total debt, net of original issue discount and deferred financing costs	2,247,840	2,230,486
Less: current portion	(54,071)	(45,166)
Total long-term debt, excluding current portion	2,193,769	2,185,320
Term Loan | Term Loan Facility | USD
Debt Instrument
Total debt	0	916,153
Term Loan | Term Loan Facility | Euro
Debt Instrument
Total debt	0	335,808
Term Loan | New Term Loan Facility
Debt Instrument
Total debt	1,260,665	0
Senior Notes | 6.75% Senior Secured Notes due 2022
Debt Instrument
Total debt	$ 625,000	625,000
Debt instrument stated interest rate	6.75%
Senior Notes | 5.75% Senior Unsecured Notes due 2025
Debt Instrument
Total debt	$ 300,000	300,000
Debt instrument stated interest rate	5.75%
Line of Credit | ABL Facility
Debt Instrument
Total debt	$ 32,000	25,000
Other
Debt Instrument
Total debt	$ 69,990	$ 68,318

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Long-term Debt - Narratives (Details) € in Thousands		6 Months Ended
	Feb. 08, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 EUR (€)	Dec. 31, 2017 USD ($)
Debt Instrument
Long-term debt, fair value difference from carrying value		$ 16,496,000		$ 59,319,000
Currency swap
Debt Instrument
Derivative instrument		327,102,000	€ 280,000
Term Loan | New Term Loan Facility
Debt Instrument
Debt instrument face amount	$ 1,267,000,000
Scheduled repayment percentage	0.25%
Call premium	1.00%
Term Loan | New Term Loan Facility | LIBOR
Debt Instrument
Variable rate on spread	2.50%
Term Loan | Term Loan Facility
Debt Instrument
Debt extinguishment costs, financing costs		2,124,000
Debt extinguishment costs, write-off of deferred financing costs		1,403,000
Debt extinguishment costs, write-off of debt discounts		$ 2,352,000

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Financial Instruments - Narratives (Details) € in Thousands, MMBTU in Millions	1 Months Ended	6 Months Ended
	Jul. 31, 2016 USD ($)	Jun. 30, 2018 USD ($) MMBTU	Jun. 30, 2018 EUR (€)
Derivative
Derivative, notional quantity (in MMBTU) | MMBTU		2.7
Amount of derivative loss expected to be transferred from OCI		$ 479,000
Interest rate caps
Derivative
Premium paid to acquire derivative instrument	$ 1,551,000
Derivative, cap interest rate		2.00%	2.00%
Derivative, notional amount	$ 1,000,000
Interest rate caps | Minimum
Derivative
Derivative, cap interest rate	1.50%
Interest rate caps | Maximum
Derivative
Derivative, cap interest rate	3.00%
Currency swap
Derivative
Derivative instrument		$ 327,102,000	€ 280,000

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Financial Instruments - Fair Value (Details) - Derivatives designated as hedging instrument - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivative assets:
Total derivative assets	$ 12,010	$ 1,043
Derivative liabilities:
Total derivative liabilities	196	448
Cash Flow Hedging
Derivative assets:
Total derivative assets	4,349	1,043
Cash Flow Hedging | Prepaid and other current assets | Natural gas swaps
Derivative assets:
Total derivative assets	2	0
Cash Flow Hedging | Prepaid and other current assets | Interest rate caps
Derivative assets:
Total derivative assets	1,208	44
Cash Flow Hedging | Other long-term assets | Interest rate caps
Derivative assets:
Total derivative assets	3,139	999
Cash Flow Hedging | Accrued liabilities | Natural gas swaps
Derivative liabilities:
Total derivative liabilities	25	318
Cash Flow Hedging | Other long-term liabilities | Natural gas swaps
Derivative liabilities:
Total derivative liabilities	171	130
Net Investment Hedging
Derivative assets:
Total derivative assets	7,661	0
Net Investment Hedging | Prepaid and other current assets | Cross currency swaps
Derivative assets:
Total derivative assets	5,367	0
Net Investment Hedging | Other long-term assets | Cross currency swaps
Derivative assets:
Total derivative assets	$ 2,294	$ 0

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Financial Instruments - Effect on Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Amount of gain (loss) recognized in OCI on derivatives
Amount of gain (loss) recognized in OCI on derivatives	$ 580	$ (2,063)	$ 3,485	$ (4,909)
Amount of gain (loss) reclassified from AOCI into income
Amount of gain (loss) reclassified from AOCI into income	(157)	(37)	(164)	(21)
Interest rate caps
Amount of gain (loss) recognized in OCI on derivatives
Amount of gain (loss) recognized in OCI on derivatives	451	(1,839)	3,303	(4,150)
Interest rate caps | Interest expense
Amount of gain (loss) reclassified from AOCI into income
Amount of gain (loss) reclassified from AOCI into income	(58)	(9)	(93)	(11)
Natural gas swaps
Amount of gain (loss) recognized in OCI on derivatives
Amount of gain (loss) recognized in OCI on derivatives	129	(224)	182	(759)
Natural gas swaps | Cost of goods sold
Amount of gain (loss) reclassified from AOCI into income
Amount of gain (loss) reclassified from AOCI into income	$ (99)	$ (28)	$ (71)	$ (10)

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Financial Instruments - Cash Flow Hedge Impact on AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative
Cost of goods sold	$ (326,309)	$ (281,853)	$ (614,385)	$ (532,072)
Interest (expense) income	(27,221)	(48,176)	(56,384)	(94,961)
Gain (loss) on cash flow hedging relationships | Amount of gain (loss) reclassified from AOCI into income
Derivative
Cost of goods sold	(99)	(28)	(71)	(10)
Interest (expense) income	$ (58)	$ (9)	$ (93)	$ (11)

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Financial Instruments - Net Investment Hedge Impact on AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Gain (loss) on sale of subsidiary
Derivative
Amount of gain (loss) reclassified from AOCI into income	$ 0	$ 0	$ 0	$ 0
Interest (expense) income
Derivative
Amount of gain (loss) recognized in income on derivative (amount excluded from effectiveness testing)	2,224	0	3,391	0
Cross currency swaps
Derivative
Amount of gain (loss) recognized in OCI on derivative	$ 16,937	$ 0	$ 7,661	$ 0

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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	45.80%	224.90%	44.00%	(2.50%)
Tax Cuts And Jobs Act Of 2017, provisional income tax benefit					$ 64,343
Tax Cuts And Jobs Act Of 2017, repatriation of non-US earnings					43,000
Tax Cuts And Jobs Act Of 2017, benefit from undistributed foreign earnings					$ 25,196
Discrete tax expenses			$ 1,090

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Benefit Plans - Net Periodic Pension Expense Benefit (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Pension Plans | U.S.
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Service cost	$ 223	$ 304	$ 533	$ 609
Interest cost	2,369	2,536	4,741	5,072
Expected return on plan assets	(3,176)	(3,061)	(6,350)	(6,122)
Amortization of net loss	0	0	0	0
Curtailment gain recognized	(576)	0	(576)	0
Net periodic expense (benefit)	(1,160)	(221)	(1,652)	(441)
Defined Benefit Pension Plans | Foreign
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Service cost	845	941	1,732	1,783
Interest cost	1,608	1,254	3,113	2,685
Expected return on plan assets	(1,628)	(923)	(2,947)	(2,217)
Amortization of net loss	12	0	25	0
Curtailment gain recognized	0	0	0	0
Net periodic expense (benefit)	837	1,272	1,923	2,251
Supplemental Retirement Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Interest cost	110	123	220	246
Net periodic expense (benefit)	110	123	220	246
Other Postretirement Benefits Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Service cost	3	5	9	10
Interest cost	27	41	65	81
Amortization of prior service credit	(20)	(20)	(39)	(39)
Amortization of net loss	(11)	(19)	(22)	(38)
Net periodic expense (benefit)	$ (1)	$ 7	$ 13	$ 14

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Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2005
Soil and Groundwater Contamination
Loss Contingencies
Accrual for environmental loss contingencies	$ 821	$ 837
Subsurface Remedial and Wetlands/Marsh Management
Loss Contingencies
Accrual for environmental loss contingencies	1,107	1,245
Subsurface Remediation and Soil Vapor Extraction
Loss Contingencies
Accrual for environmental loss contingencies	1,080	1,220
New Jersey Locations | PCB Remediation
Loss Contingencies
Accrual for environmental loss contingencies	948	842	$ 500
Chester And Baltimore Facilities | PCB Remediation
Loss Contingencies
Accrual for environmental loss contingencies	$ 670	$ 701

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Reportable Segments - Summary Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting, Revenue Reconciling Item
Net sales	$ 434,713	$ 389,267	$ 800,910	$ 722,198
Equity in net income from affiliated companies	13,666	8,745	25,518	14,622
Environmental Catalysts & Services | Zeolyst Joint Venture
Segment Reporting, Revenue Reconciling Item
Segment Adjusted EBITDA	17,874	13,205	34,681	25,292
Equity in net income from affiliated companies	13,616	8,675	25,442	14,499
Investment in affiliate and inventory step-up amortization	1,659	1,659	3,317	5,283
Joint venture depreciation, amortization, and interest	2,599	2,871	5,922	5,510
Operating segments
Segment Reporting, Revenue Reconciling Item
Segment Adjusted EBITDA	138,253	130,644	253,826	239,534
Operating segments | Environmental Catalysts & Services
Segment Reporting, Revenue Reconciling Item
Net sales	129,418	123,992	246,605	235,273
Segment Adjusted EBITDA	64,864	64,311	123,285	120,678
Operating segments | Environmental Catalysts & Services | Zeolyst Joint Venture
Segment Reporting, Revenue Reconciling Item
Net sales	49,513	30,661	87,862	63,369
Operating segments | Environmental Catalysts & Services | Reportable Subsegments | Silica Catalysts
Segment Reporting, Revenue Reconciling Item
Net sales	17,347	20,045	33,820	37,185
Operating segments | Environmental Catalysts & Services | Reportable Subsegments | Environmental Catalysts & Services
Segment Reporting, Revenue Reconciling Item
Net sales	112,071	103,947	212,785	198,088
Operating segments | Performance Materials & Chemicals
Segment Reporting, Revenue Reconciling Item
Net sales	306,161	266,104	555,983	488,709
Segment Adjusted EBITDA	73,389	66,333	130,541	118,856
Operating segments | Performance Materials & Chemicals | Reportable Subsegments | Performance Chemicals
Segment Reporting, Revenue Reconciling Item
Net sales	183,761	169,038	373,724	339,987
Operating segments | Performance Materials & Chemicals | Reportable Subsegments | Performance Materials
Segment Reporting, Revenue Reconciling Item
Net sales	126,538	99,470	189,280	153,243
Operating segments | Performance Materials & Chemicals | Intersubsegment Eliminations
Segment Reporting, Revenue Reconciling Item
Net sales	(4,138)	(2,404)	(7,021)	(4,521)
Eliminations
Segment Reporting, Revenue Reconciling Item
Net sales	$ (866)	$ (829)	$ (1,678)	$ (1,784)

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Reportable Segments - Reconciliation of Net Loss to Adjusted EBITA (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information
Net income (loss) attributable to PQ Group Holdings Inc.	$ 15,782	$ (1,609)	$ 15,996	$ (4,063)
Provision for income taxes	13,649	3,007	13,120	97
Interest expense, net	27,221	48,176	56,384	94,961
Depreciation and amortization	46,983	42,620	95,471	83,206
Segment EBITDA	103,635	92,194	180,971	174,201
Debt extinguishment costs	0	0	5,879	0
Losses on disposal of fixed assets	4,752	2,577	5,904	2,925
Foreign currency exchange loss			11,820	16,356
Management advisory fees	0	1,250	0	2,500
Transaction and other related costs	190	2,954	612	4,329
Restructuring, integration and business optimization expenses			107
Corporate, non-segment
Segment Reporting Information
Unallocated corporate expenses	9,358	7,882	17,046	15,589
Segment reconciling items
Segment Reporting Information
Joint venture depreciation, amortization, and interest	2,599	2,871	5,922	5,510
Investment in affiliate and inventory step-up amortization	1,659	1,658	3,317	5,282
Amortization of inventory step-up	0	0	1,603	871
Debt extinguishment costs	0	0	5,879	0
Losses on disposal of fixed assets	4,752	2,577	5,904	2,925
Foreign currency exchange loss	6,757	14,370	11,820	16,356
Non-cash revaluation of inventory, including LIFO	121	0	5,047	2,479
Management advisory fees	0	1,250	0	2,500
Transaction and other related costs	257	2,955	685	4,334
Equity-based and other non-cash compensation	3,796	1,176	7,627	2,828
Restructuring, integration and business optimization expenses	2,405	1,351	3,484	3,052
Defined benefit pension plan cost	(402)	685	148	1,409
Other	3,316	1,675	4,373	2,198
Operating segments
Segment Reporting Information
Segment Adjusted EBITDA	$ 138,253	$ 130,644	$ 253,826	$ 239,534

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Restructuring and Other Related Costs - Components of Restructuring and Other Related Costs (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve
Restructuring and other related costs	$ 10,000	$ 276,000	$ 130,000	$ 1,472,000
Restructuring charges			107,000
Other related costs
Restructuring Cost and Reserve
Restructuring and other related costs	10,000	276,000	23,000	642,000
Legacy Eco Restructuring Plan
Restructuring Cost and Reserve
Restructuring charges			0
Legacy Eco Restructuring Plan | Employee Severance
Restructuring Cost and Reserve
Restructuring and other related costs	0	0	0	830,000
Performance Materials Plant Closure
Restructuring Cost and Reserve
Restructuring charges			107,000
Performance Materials Plant Closure | Employee Severance
Restructuring Cost and Reserve
Restructuring and other related costs	0	$ 0	$ 107,000	$ 0
Restructuring charges	$ 0

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Restructuring and Other Related Costs - Schedule of Restructuring Reserve (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Restructuring Reserve
Beginning balance	$ 3,338
Restructuring charges	107
Cash payments	(2,116)
Foreign exchange impact	(7)
Ending balance	1,322
Legacy Eco Restructuring Plan
Restructuring Reserve
Beginning balance	215
Restructuring charges	0
Cash payments	(192)
Foreign exchange impact	0
Ending balance	23
Performance Materials Plant Closure
Restructuring Reserve
Beginning balance	3,123
Restructuring charges	107
Cash payments	(1,924)
Foreign exchange impact	(7)
Ending balance	$ 1,299

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Earnings per Share - Reconciliation from Basic to Diluted Weighted Average Shares Outstanding (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Weighted average shares outstanding – Basic (shares)	133,222,463	104,015,815	133,188,303	103,981,851
Dilutive effect of unvested common shares and restricted stock units with service conditions and assumed stock option exercises and conversions (shares)	987,277	0	859,059	0
Weighted average shares outstanding – Diluted (shares)	134,209,740	104,015,815	134,047,362	103,981,851

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Earnings per Share - Reconciliation of Net Income (Loss) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income (loss) attributable to PQ Group Holdings Inc.	$ 15,782	$ (1,609)	$ 15,996	$ (4,063)
Denominator:
Weighted average shares outstanding – Basic (shares)	133,222,463	104,015,815	133,188,303	103,981,851
Weighted average shares outstanding – Diluted (shares)	134,209,740	104,015,815	134,047,362	103,981,851
Net income (loss) per share:
Basic income (loss) per share (usd per share)	$ 0.12	$ (0.02)	$ 0.12	$ (0.04)
Diluted income (loss) per share (usd per share)	$ 0.12	$ (0.02)	$ 0.12	$ (0.04)

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Earnings per Share - Anti-dilutive Shares (Details) - shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Performance based restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive (shares)	1,659,050	1,769,447
Performance based stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive (shares)	586,253	651,255
Restricted stock awards and restricted units
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive (shares)	0	341,880
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive (shares)	621,747	1,539,266

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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash paid during the period for:
Income taxes	$ 11,053	$ 15,904
Interest	60,210	91,710
Non-cash investing activity:
Capital expenditures acquired on account but unpaid as of the period end	$ 11,875	$ 11,681

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Supplemental Cash Flow Information - Cash and Restricted Cash Reconciliation (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 52,553	$ 66,195	$ 50,457
Restricted cash included in prepaid and other current assets	1,332		4,976
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	$ 53,885	$ 67,243	$ 55,433	$ 85,077