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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 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings per Share [Line Items]                
Net income $ 81,007 $ 2,638 $ (16,832) $ 20,565 $ 17,137 $ 6,560 $ 66,813 $ 44,262
Basic weighted-average shares outstanding 67,149     67,446     67,263 67,781
Diluted weighted-average shares outstanding 67,528     67,545     67,535 67,848
Basic net income per share $ 1.21     $ 0.30     $ 0.99 $ 0.65
Diluted net income per share $ 1.20     $ 0.30     $ 0.99 $ 0.65
Performance shares [Member]                
Earnings per Share [Line Items]                
Incremental shares 320     65     238 50
Restricted stock units [Member]                
Earnings per Share [Line Items]                
Incremental shares 59     34     34 17