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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net income per share calculations for basic and diluted methods        
Net income $ 29,766 $ 25,806 $ 67,582 $ 41,170
Shares:        
Weighted average common shares outstanding 55,050,071 54,489,403 54,762,563 54,575,595
Dilutive effect of outstanding options, warrants, and restricted stock units as determined by the application of the treasury stock method (in shares) 680,812 215,870 622,379 231,575
Weighted average common shares outstanding, as adjusted for diluted earnings per share calculation 55,730,883 54,705,273 55,384,942 54,807,170
Basic earnings per common share (in dollars per share) $ 0.54 $ 0.47 $ 1.23 $ 0.75
Diluted earnings per common share (in dollars per share) $ 0.53 $ 0.47 $ 1.22 $ 0.75
Total anti-dilutive common stock equivalents 86,080 406,993 222,180 406,646
Options        
Shares:        
Total anti-dilutive common stock equivalents   39,525   39,525
RSUs and DSUs        
Shares:        
Total anti-dilutive common stock equivalents   367,468 121,698 367,121
PSUs        
Shares:        
Total anti-dilutive common stock equivalents 86,080   100,482