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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
EARNINGS PER SHARE            
Weighted-average anti-dilutive stock options outstanding (in shares) 500,000 500,000 700,000 500,000    
Basic earnings per share [Abstract]            
Net income $ 42,809 $ 39,218 $ 118,191 $ 126,179    
Income attributable to unvested stock-based compensation awards (147) (102) (432) (331)    
Income available to common shareholders $ 42,662 $ 39,116 $ 117,759 $ 125,848    
Weighted-average common shares outstanding - basic (in shares) 53,650,000 51,750,000 52,727,000 51,644,000    
Basic earnings per share (in dollars per share) $ 0.80 $ 0.76 $ 2.23 $ 2.44    
Diluted earnings per share [Abstract]            
Net income $ 42,809 $ 39,218 $ 118,191 $ 126,179    
Income attributable to unvested stock-based compensation awards (147) (102) (432) (331)    
Income available to common shareholders $ 42,662 $ 39,116 $ 117,759 $ 125,848    
Weighted-average common shares outstanding - basic (in shares) 53,650,000 51,750,000 52,727,000 51,644,000    
Assumed exercise of stock options (in shares) 324,000 496,000 356,000 522,000    
Weighted-average common shares outstanding - diluted (in shares) 53,974,000 52,246,000 53,083,000 52,166,000    
Diluted earnings per share (in dollars per share) $ 0.79 $ 0.75 $ 2.22 $ 2.41    
Stock Repurchase Program [Abstract]            
Number of common shares authorized to be repurchased (in shares)         2,600,000 2,500,000
Number of common shares repurchased (in shares)     0 0