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Acquisitions (Pro Forma Income Statements) (Details) - USD ($)
$ / shares in Units, $ 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, Pro Forma Information                      
Net sales                     $ 640,596
Gross profit                     138,123
Net loss                     $ (44,399)
Diluted (loss) earnings per common share (usd per share) $ 0.03 $ 0.31 $ 0.29 $ (0.23) $ (3.97) $ (0.58) $ (8.96) $ (0.28) $ 0.39 $ (13.79) $ (4.33)
Dilutive (loss) earnings per share Pro forma (usd per share)                     $ (4.32)