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SHARE-BASED COMPENSATION (Details) - Restricted Stock Awards and Units
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Activity of nonvested shares  
Nonvested restricted stock awards and units, beginning of period (in shares) | shares 715,460
Changes during the period:  
Granted (in shares) | shares 172,989
Vested (in shares) | shares (338,117)
Forfeited (in shares) | shares (78,155)
Nonvested restricted stock awards and units, end of period (in shares) | shares 472,177
Weighted Average Grant Date Fair Value  
Nonvested restricted stock awards and units, beginning of period (in dollars per share) $ 15.77
Changes during the period:  
Granted (in dollars per share) 19.49
Vested (in dollars per share) 15.18
Forfeited (in dollars per share) 16.63
Nonvested restricted stock awards and units, end of period (in dollars per share) $ 17.41