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Loss Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net earnings (loss) $ 12,918 $ (12,599) $ 6,828 $ (28,171)
Weighted average shares outstanding 53,508 53,306 53,455 53,272
Effect of dilutive stock awards 1,404 0 946 0
Weighted-average dilutive shares 54,912 53,306 54,401 53,272
Basic earnings (loss) per common share $ 0.24 $ (0.24) $ 0.13 $ (0.53)
Diluted earnings (loss) per common share $ 0.24 $ (0.24) $ 0.13 $ (0.53)
Restricted Stock Units [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive stock options 0 635 0 635
Performance-based restricted stock units [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive stock options 211 784 211 784
Employee Stock Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive stock options 1,417 3,103 1,672 3,103