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STOCK-BASED COMPENSATION - Summary of changes in non vested restricted shares (Details 1) - Restricted Stock
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Shares  
Non-vested shares at December 31, 2018 | shares 947,710
Granted | shares 141,600
Vested | shares (248,770)
Forfeited | shares (1,000)
Non-vested shares at March 31, 2019 | shares 839,540
Weighted Average Grant-Date Fair Value  
Non-vested shares at December 31, 2018 | $ / shares $ 9.41
Granted | $ / shares 17.21
Vested | $ / shares 7.64
Forfeited | $ / shares 5.90
Non-vested shares at March 31, 2019 | $ / shares $ 11.26