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EARNINGS PER 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
Dec. 31, 2020
Dec. 31, 2019
EARNINGS PER SHARE            
Weighted-average anti-dilutive stock options outstanding (in shares) 200,000 600,000 100,000 600,000    
Basic earnings per share [Abstract]            
Net income $ 47,944 $ 35,248 $ 100,794 $ 75,382    
Income attributable to unvested stock-based compensation awards (127) (127) (263) (264)    
Income available to common shareholders $ 47,817 $ 35,121 $ 100,531 $ 75,118    
Weighted-average common shares outstanding - basic (in shares) 54,007,000 52,487,000 53,927,000 52,262,000    
Basic earnings per share (in dollars per share) $ 0.89 $ 0.67 $ 1.86 $ 1.44    
Diluted earnings per share [Abstract]            
Net income $ 47,944 $ 35,248 $ 100,794 $ 75,382    
Income attributable to unvested stock-based compensation awards (127) (127) (263) (264)    
Income available to common shareholders $ 47,817 $ 35,121 $ 100,531 $ 75,118    
Weighted-average common shares outstanding - basic (in shares) 54,007,000 52,487,000 53,927,000 52,262,000    
Assumed exercise of stock options (in shares) 462,000 339,000 455,000 372,000    
Weighted-average common shares outstanding - diluted (in shares) 54,469,000 52,826,000 54,382,000 52,634,000    
Diluted earnings per share (in dollars per share) $ 0.88 $ 0.66 $ 1.85 $ 1.43    
Stock Repurchase Program [Abstract]            
Number of common shares authorized to be repurchased (in shares)         2,680,000 2,600,000
Number of common shares repurchased (in shares)     0 0