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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net income per share calculations for basic and diluted methods      
Net income $ 100,344 $ 102,953 $ 98,928
Shares:      
Weighted average common shares outstanding 54,567,429 54,851,652 48,854,330
Dilutive effect of outstanding options, warrants and restricted stock units as determined by the application of the treasury stock method (in shares) 259,510 280,842 361,125
Weighted average common shares outstanding, as adjusted for diluted earnings per share calculation 54,826,939 55,132,494 49,215,455
Basic earnings per common share (in dollars per share) $ 1.84 $ 1.88 $ 2.02
Diluted earnings per common share (in dollars per share) $ 1.83 $ 1.87 $ 2.01
Common Stock      
Anti-dilutive securities excluded from the calculation of common stock equivalents      
Number of anti-dilutive securities (in shares) 206,355 201,029 363,849