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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net income per share calculations for basic and diluted methods    
Net income $ 37,816 $ 15,364
Shares:    
Weighted average common shares outstanding 54,471,860 54,661,787
Dilutive effect of outstanding options, warrants, and restricted stock units as determined by the application of the treasury stock method (in shares) 563,946 251,542
Weighted average common shares outstanding, as adjusted for diluted earnings per share calculation 55,035,806 54,913,329
Basic earnings per common share (in dollars per share) $ 0.69 $ 0.28
Diluted earnings per common share (in dollars per share) $ 0.69 $ 0.28
Common Stock    
Shares:    
Number of anti-dilutive securities (in shares) 358,279 244,242