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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Net income $ 30,171 $ 15,239 $ 71,806 $ 47,884
Denominator (in thousands):        
Weighted-average common shares for calculating basic earnings per share (shares) 44,942 48,261 45,680 48,324
Stock options and nonvested stock awards (shares) 101 28 77 21
Weighted-average common shares for calculating diluted earnings per share (shares) 45,043 48,289 45,757 48,345
Net income per share:        
Basic (in dollars per share) $ 0.67 $ 0.32 $ 1.57 $ 0.99
Diluted (in dollars per share) $ 0.67 $ 0.32 $ 1.57 $ 0.99