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SHARE-BASED COMPENSATION (Details) - Restricted Stock Awards and Units
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Activity of nonvested shares  
Nonvested restricted stock awards and units, beginning of period (in shares) | shares 397,551
Changes during the period:  
Granted (in shares) | shares 112,794
Vested (in shares) | shares (110,336)
Forfeited (in shares) | shares (18,977)
Nonvested restricted stock awards and units, end of period (in shares) | shares 381,032
Weighted Average Grant Date Fair Value  
Nonvested restricted stock awards and units, beginning of period (in dollars per share) | $ / shares $ 25.49
Changes during the period:  
Granted (in dollars per share) | $ / shares 29.55
Vested (in dollars per share) | $ / shares 24.36
Forfeited (in dollars per share) | $ / shares 27.47
Nonvested restricted stock awards and units, end of period (in dollars per share) | $ / shares $ 26.93