Annual report pursuant to Section 13 and 15(d)

Business Combination - Narratives (Details)

v3.8.0.1
Business Combination - Narratives (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May 04, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition                        
Acquisition costs                   $ 7,415 $ 4,952 $ 4,241
Net income (loss)   $ 65,564 $ (3,016) $ (1,670) $ (2,315) $ 10,527 $ (9,606) $ (76,948) $ (3,131) 58,563 (79,158) 11,427
Debt Repayment Penalty                        
Business Acquisition                        
Net income (loss)                     (26,250)  
Refinancing Charges                        
Business Acquisition                        
Net income (loss)                     (4,747)  
Transaction Fees                        
Business Acquisition                        
Net income (loss)                     (1,795)  
PQ Holdings, Eco Services                        
Business Acquisition                        
Payments to acquire business $ 1,777,740                      
Equity consideration for the business combination 910,800                 0 910,800 $ 0
Stock awards transferred as consideration 1,400                      
Acquisition costs                     1,583  
Increase to inventory at acquisition $ 58,683                      
Cost of goods sold, additional portion related to step-up inventory price                   $ 871 29,086  
Net sales attributable to acquiree                     690,459  
Net income (loss) from acquiree                     $ 17,991