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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
EARNINGS PER SHARE      
Weighted-average anti-dilutive stock options outstanding (in shares) 100,000 600,000 500,000
Basic earnings per share      
Net income $ 189,694 $ 164,676 $ 169,063
Income attributable to unvested stock-based compensation awards (445) (514) (400)
Income available to common shareholders $ 189,249 $ 164,162 $ 168,663
Weighted-average common shares outstanding - basic (in shares) 53,977,000 52,969,000 51,732,000
Basic earnings per share (in dollars per share) $ 3.51 $ 3.10 $ 3.26
Diluted earnings per share      
Net income $ 189,694 $ 164,676 $ 169,063
Income attributable to unvested stock-based compensation awards (445) (514) (400)
Income available to common shareholders $ 189,249 $ 164,162 $ 168,663
Weighted-average common shares outstanding (in shares) 53,977,000 52,969,000 51,732,000
Assumed exercise of stock options (in shares) 423,000 352,000 516,000
Weighted-average common shares outstanding - diluted (in shares) 54,400,000 53,321,000 52,248,000
Diluted earnings per share (in dollars per share) $ 3.48 $ 3.08 $ 3.23
Cash dividends declared per share (in dollars per share) $ 1.70 $ 1.66 $ 1.58
Stock Repurchase Program      
Number of common shares authorized to be repurchased (in shares) 2,697,000 2,680,000  
Number of common shares repurchased (in shares) 67,500