Annual report pursuant to Section 13 and 15(d)

Acquisitions - Narratives (Details)

v3.8.0.1
Acquisitions - Narratives (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
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                      
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
Acquisition costs                 $ 7,415 $ 4,952 $ 4,241
Sovitec Mondial S.A.                      
Business Acquisition                      
Net sales attributable to acquiree 26,257                    
Net income from acquiree 1,370                    
Acquisition costs 2,515                    
Sovitec Mondial S.A. | Acquisition-related costs                      
Business Acquisition                      
Net income (loss) $ 2,515