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STOCK-BASED COMPENSATION (Detail Textuals 2) - Restricted Stock
6 Months Ended
Jun. 30, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation cost related to non-vested restricted shares $ 7,780,000
Unrecognized compensation cost related to non-vested restricted shares recognized period 3.7 years