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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share Reconciliation [Line Items]    
Net income (loss) $ 13,773 $ (23,641)
Denominator for basic earnings per share - weighted-average number of common shares outstanding during the period 40,630 48,517
Denominator for diluted earnings per share 40,853 48,517
Basic earnings per share $ 0.34 $ (0.49)
Diluted earnings per share $ 0.34 $ (0.49)
Anti-dilutive securities to purchase common shares 100 300
Stock Options [Member]    
Earnings Per Share Reconciliation [Line Items]    
Incremental common shares attributable to stock-based awards 76 0
Restricted Stock Units [Member]    
Earnings Per Share Reconciliation [Line Items]    
Incremental common shares attributable to stock-based awards 147 0