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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net income $ 33,715 $ 32,918
Denominator:    
Weighted-average common shares for calculating basic earnings per share (shares) 41,034 41,912
Stock options and nonvested stock awards (shares) 22 95
Weighted-average common shares for calculating diluted earnings per share (shares) 41,056 42,007
Earnings per share:    
Basic (USD per share) $ 0.82 $ 0.79
Diluted (USD per share) $ 0.82 $ 0.78