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SHARE-BASED COMPENSATION (Details) - 6 months ended Jun. 30, 2015 - Restricted Stock Awards and Units - $ / shares
Total
Activity of nonvested shares  
Nonvested at the beginning of the period (in shares) 715,460
Changes during the period:  
Granted (in shares) 137,878
Vested (in shares) (336,417)
Forfeited (in shares) (44,210)
Nonvested at the end of the period (in shares) 472,711
Weighted Average Grant Date Fair Value  
Nonvested at the beginning of the period (in dollars per share) $ 15.77
Changes during the period:  
Granted (in dollars per share) 18.67
Vested (in dollars per share) 15.19
Forfeited (in dollars per share) 16.25
Nonvested at the end of the period (in dollars per share) $ 16.98