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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, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:                
Net income $ 33,396 $ 28,427 $ 33,715 $ 15,062 $ 25,873 $ 32,918 $ 95,538 $ 73,853
Denominator:                
Weighted-average common shares for calculating basic earnings per share (shares) 40,453     41,440     40,745 41,597
Stock options and nonvested stock awards (shares) 63     96     44 94
Weighted-average common shares for calculating diluted earnings per share (shares) 40,516     41,536     40,789 41,691
Earnings per share:                
Basic (USD per share) $ 0.83     $ 0.36     $ 2.34 $ 1.78
Diluted (USD per share) $ 0.82     $ 0.36     $ 2.34 $ 1.77