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EARNINGS PER SHARE - Schedule of Basic and Diluted Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Basic and Diluted Earnings Per Common Share                
Basic weighted average number of shares outstanding 36,603     36,569     36,677 36,736
Effect of dilutive securities:                
Unvested restricted stock 475     377     432 400
Diluted average shares outstanding 37,078     36,946     37,109 37,136
Net earnings as reported (in dollars) $ 221,760 $ 186,836 $ 131,301 $ 262,489 $ 250,084 $ 217,254 $ 539,897 $ 729,827
Basic earnings per share (in dollars per share) $ 6.06     $ 7.18     $ 14.72 $ 19.87
Diluted earnings per share (in dollars per share) $ 5.98     $ 7.10     $ 14.55 $ 19.65