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STOCK-BASED COMPENSATION - Non vested RSU's (Details) - Restricted Stock
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Shares  
Non-vested shares at beginning | shares 678,220
Granted | shares 189,750
Vested | shares (194,800)
Non-vested shares at ending | shares 673,170
Weighted Average Grant-Date Fair Value  
Non-vested shares at beginning | $ / shares $ 12.89
Granted | $ / shares 16.55
Vested | $ / shares 10.25
Non-vested shares at ending | $ / shares $ 14.69