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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, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator:            
Net income $ 45,180 $ 47,388 $ 86,108 $ 28,005 $ 92,568 $ 114,113
Denominator:            
Weighted-average common shares for calculating basic earnings per share (shares) 45,455   47,425   45,799 47,831
Stock options and nonvested stock awards (shares) 223   74   194 66
Weighted-average common shares for calculating diluted earnings per share (shares) 45,678   47,499   45,993 47,897
Earnings per share:            
Basic (USD per share) $ 0.99   $ 1.82   $ 2.02 $ 2.39
Diluted (USD per share) $ 0.99   $ 1.81   $ 2.01 $ 2.38