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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, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings per Share [Line Items]                
Net income $ 20,565 $ 17,137 $ 6,560 $ 60,336 $ 46,148 $ 14,597 $ 44,262 $ 121,081
Basic weighted-average shares outstanding 67,446     62,986     67,781 58,765
Diluted weighted-average shares outstanding 67,545     64,722     67,848 59,542
Basic net income per share $ 0.30     $ 0.96     $ 0.65 $ 2.06
Diluted net income per share $ 0.30     $ 0.93     $ 0.65 $ 2.03
Performance shares [Member]                
Earnings per Share [Line Items]                
Incremental shares 65     270     50 263
Restricted stock units [Member]                
Earnings per Share [Line Items]                
Incremental shares 34     37     17 33
Stock portion of earnings and profits distribution [Member]                
Earnings per Share [Line Items]                
Incremental shares       1,429       481