Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Summary (Unaudited) (Details)

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Quarterly Financial Summary (Unaudited) (Details) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Sales $ 352,375 $ 423,801 $ 431,675 $ 359,221 $ 380,041 $ 427,203 $ 434,713 $ 366,197 $ 1,567,072 $ 1,608,154 $ 1,472,101
Gross profit 81,220 112,897 115,495 80,910 87,609 107,500 108,404 78,121 390,522 381,634 376,836
Operating income 30,464 57,574 70,301 29,463 57,459 48,854 49,054 28,189 187,802 183,556 165,888
Net income 19,331 26,819 30,719 3,441 28,470 14,436 16,159 556 80,310 59,621 58,563
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
Net income per share:                      
Basic income per share (usd per share) $ 0.14 $ 0.20 $ 0.23 $ 0.02 $ 0.21 $ 0.11 $ 0.12 $ 0 $ 0.59 $ 0.44 $ 0.52
Diluted income per share (usd per share) $ 0.14 $ 0.20 $ 0.23 $ 0.02 $ 0.21 $ 0.11 $ 0.12 $ 0 $ 0.59 $ 0.43 $ 0.52
Weighted average shares outstanding:                      
Basic (shares) 134,912,212 134,511,819 134,142,552 133,946,308 133,765,294 133,336,352 133,222,463 133,154,144 134,389,667 133,380,567 111,299,670
Diluted (shares) 136,151,739 135,649,710 135,323,024 134,894,354 134,987,604 134,576,162 134,209,740 133,884,983 135,548,694 134,684,931 111,669,037