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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 [Abstract]            
Net income $ 33,048 $ 42,655 $ 30,171 $ 41,635 $ 75,703 $ 71,806
Denominator:            
Weighted-average common shares for calculating basic earnings per share (shares) 43,081   44,942   43,298 45,680
Stock options and nonvested stock awards (shares) 175   101   158 77
Weighted-average common shares for calculating diluted earnings per share (shares) 43,256   45,043   43,456 45,757
Earnings per share:            
Basic (in dollars per share) $ 0.77   $ 0.67   $ 1.75 $ 1.57
Diluted (in dollars per share) $ 0.76   $ 0.67   $ 1.74 $ 1.57