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Net Income per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Basic:        
Net income $ 15,696 $ 47,993 $ 61,440 $ 91,462
Average common shares outstanding (in shares) 32,081 31,963 32,057 31,916
Basic net income per common share (in dollars per share) $ 0.49 $ 1.50 $ 1.92 $ 2.87
Diluted:        
Net income $ 15,696 $ 47,993 $ 61,440 $ 91,462
Average common shares outstanding (in shares) 32,081 31,963 32,057 31,916
Adjustment for common share equivalents (in shares) 62 62 69 58
Average common shares outstanding-diluted (in shares) 32,143 32,025 32,126 31,974
Diluted net income per common share (in dollars per share) $ 0.49 $ 1.50 $ 1.91 $ 2.86
Anti-dilutive shares (in shares) 0 3 0 3