Annual report pursuant to Section 13 and 15(d)

Supplemental Cash Flow Information - Supplemental Cash Flow Information (Details)

v3.10.0.1
Supplemental Cash Flow Information - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 04, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash paid during the year for:        
Income taxes, net of refunds   $ 23,842 $ 29,199 $ 16,981
Interest   105,057 170,131 132,579
Non-cash investing activity:        
Capital expenditures acquired on account but unpaid as of the year end   23,498 18,762 18,161
PQ Holdings, Eco Services        
Non-cash financing activities:        
Equity consideration for the Business Combination $ 910,800 0 0 910,800
Debt assumed   0 0 22,911
Sovitec Mondial S.A.        
Non-cash financing activities:        
Debt assumed   $ 0 $ 16,609 $ 0