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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, 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 [Abstract]                
Net income $ 34,761 $ 33,048 $ 42,655 $ 33,325 $ 30,171 $ 41,635 $ 110,464 $ 105,131
Denominator:                
Weighted-average common shares for calculating basic earnings per share (shares) 42,957     43,981     43,183 45,107
Stock options and nonvested stock awards (shares) 210     135     175 97
Weighted-average common shares for calculating diluted earnings per share (shares) 43,167     44,116     43,358 45,204
Earnings per share:                
Basic (USD per share) $ 0.81     $ 0.76     $ 2.56 $ 2.33
Diluted (USD per share) $ 0.81     $ 0.76     $ 2.55 $ 2.33