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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, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]                
Net income $ 15,062 $ 25,873 $ 32,918 $ 34,761 $ 33,048 $ 42,655 $ 73,853 $ 110,464
Denominator:                
Weighted-average common shares for calculating basic earnings per share (shares) 41,440     42,957     41,597 43,183
Stock options and nonvested stock awards (shares) 96     210     94 175
Weighted-average common shares for calculating diluted earnings per share (shares) 41,536     43,167     41,691 43,358
Earnings per share:                
Basic (USD per share) $ 0.36     $ 0.81     $ 1.78 $ 2.56
Diluted (USD per share) $ 0.36     $ 0.81     $ 1.77 $ 2.55