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Earnings per Share (Reconciliation of Number of Shares Used in Calculating Basic and Diluted Earnings per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings per Share [Line Items]    
Net (loss) income $ (16,832) $ 6,560
Basic weighted-average shares outstanding 67,478 67,860
Diluted weighted-average shares outstanding 67,478 67,916
Basic net (loss) income per share $ (0.25) $ 0.10
Diluted net (loss) income per share $ (0.25) $ 0.10
Performance shares [Member]    
Earnings per Share [Line Items]    
Incremental shares   36
Restricted stock units [Member]    
Earnings per Share [Line Items]    
Incremental shares   20