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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, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings per Share [Line Items]            
Net income $ 17,137 $ 6,560 $ 46,148 $ 14,597 $ 23,697 $ 60,745
Basic weighted-average shares outstanding 67,664   62,980   67,774 56,739
Diluted weighted-average shares outstanding 67,713   63,316   67,866 57,128
Basic net income per share $ 0.25   $ 0.73   $ 0.35 $ 1.07
Diluted net income per share $ 0.25   $ 0.73   $ 0.35 $ 1.06
Performance shares [Member]            
Earnings per Share [Line Items]            
Incremental shares 26   303   21 299
Restricted stock units [Member]            
Earnings per Share [Line Items]            
Incremental shares 23   33   71 90