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EMPLOYEE BENEFIT PLANS - Summary of changes in non-vested restricted shares (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares      
Non-vested shares at beginning 947,710 1,040,800  
Granted 141,600 193,500  
Vested (260,770) (283,790)  
Forfeited (13,000) (2,800)  
Non-vested shares at ending 815,540 947,710 1,040,800
Weighted Average Grant-Date Fair Value      
Non-vested shares at beginning $ 9.41 $ 7.76  
Granted 17.21 13.97 $ 13.39
Vested 7.65 6.45  
Forfeited 11.68 8.54  
Non-vested shares at ending $ 11.29 $ 9.41 $ 7.76