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EMPLOYEE BENEFIT PLANS - Summary of changes in non-vested restricted shares (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shares      
Non-vested shares 1,040,800 1,200,900  
Granted 193,500 202,400  
Vested (283,790) (344,250)  
Forfeited (2,800) (18,250)  
Non-vested shares 947,710 1,040,800 1,200,900
Weighted Average Grant-Date Fair Value      
Non-vested shares $ 7.76 $ 6.58  
Granted 13.97 13.39 $ 5.77
Vested 6.45 6.92  
Forfeited 8.54 8.47  
Non-vested shares $ 9.41 $ 7.76 $ 6.58