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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
EARNINGS PER SHARE      
Weighted-average anti-dilutive stock options outstanding (in shares) 600,000 500,000 400,000
Basic earnings per share [Abstract]      
Net income $ 164,676 $ 169,063 $ 168,641
Income attributable to unvested stock-based compensation awards (514) (400) (744)
Income available to common shareholders $ 164,162 $ 168,663 $ 167,897
Weighted-average common shares outstanding - basic (in shares) 52,969,000 51,732,000 51,165,000
Basic earnings per share (in dollars per share) $ 3.10 $ 3.26 $ 3.28
Diluted earnings per share [Abstract]      
Net income $ 164,676 $ 169,063 $ 168,641
Income attributable to unvested stock-based compensation awards (514) (400) (744)
Income available to common shareholders $ 164,162 $ 168,663 $ 167,897
Weighted-average common shares outstanding (in shares) 52,969,000 51,732,000 51,165,000
Assumed exercise of stock options (in shares) 352,000 516,000 583,000
Weighted-average common shares outstanding - diluted (in shares) 53,321,000 52,248,000 51,748,000
Diluted earnings per share (in dollars per share) $ 3.08 $ 3.23 $ 3.24
Cash dividends declared per share (in dollars per share) $ 1.66 $ 1.58 $ 1.44
Stock Repurchase Program [Abstract]      
Number of common shares authorized to be repurchased (in shares) 2,600,000 2,680,000  
Number of common shares repurchased (in shares) 0