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SHARE-BASED COMPENSATION (Details) (Restricted Stock Awards and Units, USD $)
3 Months Ended
Mar. 31, 2013
Restricted Stock Awards and Units
 
Activity of nonvested shares  
Nonvested at the beginning of the period (in shares) 1,098,806
Changes during the period:  
Granted (in shares) 103,558
Vested (in shares) (650)
Forfeited (in shares) (26,570)
Nonvested at the end of the period (in shares) 1,175,144
Weighted Average Grant Date Fair Value  
Nonvested at the beginning of the period (in dollars per share) $ 14.61
Changes during the period:  
Granted (in dollars per share) $ 15.49
Vested (in dollars per share) $ 13.84
Forfeited (in dollars per share) $ 14.63
Nonvested at the end of the period (in dollars per share) $ 14.68