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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 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings per Share [Line Items]            
Net income (loss) $ 2,638 $ (16,832) $ 17,137 $ 6,560 $ (14,194) $ 23,697
Basic weighted-average shares outstanding 67,176   67,664   67,321 67,774
Diluted weighted-average shares outstanding 67,359   67,713   67,321 67,866
Basic net income (loss) per share $ 0.04   $ 0.25   $ (0.21) $ 0.35
Diluted net income (loss) per share $ 0.04   $ 0.25   $ (0.21) $ 0.35
Performance shares [Member]            
Earnings per Share [Line Items]            
Incremental shares 153   26     21
Restricted stock units [Member]            
Earnings per Share [Line Items]            
Incremental shares 30   23     71