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Acquisitions - Consolidated Results of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Combinations [Abstract]                      
Net sales                 $ 825,891 $ 760,772  
Income (loss) from continuing operations                 (252,268) 3,227  
Revenues $ 199,477 $ 205,683 $ 196,349 $ 169,148 $ 156,135 $ 148,156 $ 157,947 $ 157,555 770,657 619,793 $ 584,954
Income (loss) from continuing operations $ (220,189) $ (13,784) $ (24,511) $ (5,983) $ 53,325 $ (3,480) $ (26,374) $ 1,893 $ (264,467) $ 25,364 $ (9,490)