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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net income $ 33,325 $ 28,274 $ 105,131 $ 76,158
Denominator:        
Weighted-average common shares for calculating basic earnings per share (shares) 43,981 47,628 45,107 48,090
Stock options and nonvested stock awards (shares) 135 40 97 27
Weighted-average common shares for calculating diluted earnings per share (shares) 44,116 47,668 45,204 48,117
Earnings per share:        
Basic (in dollars per share) $ 0.76 $ 0.59 $ 2.33 $ 1.58
Diluted (in dollars per share) $ 0.76 $ 0.59 $ 2.33 $ 1.58