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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, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:            
Net income $ 28,427 $ 33,715 $ 25,873 $ 32,918 $ 62,142 $ 58,791
Denominator:            
Weighted-average common shares for calculating basic earnings per share (shares) 40,754   41,440   40,893 41,676
Stock options and nonvested stock awards (shares) 48   91   36 93
Weighted-average common shares for calculating diluted earnings per share (shares) 40,802   41,531   40,929 41,769
Earnings per share:            
Basic (USD per share) $ 0.70   $ 0.62   $ 1.52 $ 1.41
Diluted (USD per share) $ 0.70   $ 0.62   $ 1.52 $ 1.41