Annual report pursuant to Section 13 and 15(d)

Schedule I - Condensed Statements of Income (Details)

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Schedule I - Condensed Statements of Income (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements, Captions                      
Stock compensation                 $ 18,225 $ 19,464 $ 8,799
Net income attributable to PQ Group Holdings Inc. $ 19,101 $ 26,713 $ 30,574 $ 3,151 $ 28,119 $ 14,185 $ 15,782 $ 214 79,539 58,300 57,603
Other comprehensive income (loss), net of tax:                      
Comprehensive income attributable to PQ Group Holdings Inc.                 101,421 14,885 115,625
Parent Company                      
Condensed Financial Statements, Captions                      
Stock compensation                 18,225 19,464 8,799
Equity in net income from subsidiaries                 (97,764) (77,764) (66,402)
Net income attributable to PQ Group Holdings Inc.                 79,539 58,300 57,603
Other comprehensive income (loss), net of tax:                      
Pension and postretirement benefits                 2,430 (7,958) (101)
Net loss from hedging activities                 (2,665) (330) (3,590)
Foreign currency translation                 22,117 (35,127) 61,713
Total other comprehensive income (loss)                 21,882 (43,415) 58,022
Comprehensive income attributable to PQ Group Holdings Inc.                 $ 101,421 $ 14,885 $ 115,625