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STOCK-BASED COMPENSATION - Non-vested restricted shares activity (Details 1) (Restricted Stock, USD $)
9 Months Ended
Sep. 30, 2013
Restricted Stock
 
Shares  
Non-vested shares at December 31, 2012 4,494,191
Granted 850,500
Vested (1,078,534)
Forfeited (97,282)
Non-vested shares at September 30, 2013 4,168,875
Weighted Average Grant-Date Fair Value  
Non-vested shares at December 31, 2012 $ 8.12
Granted $ 13.68
Vested $ 6.36
Forfeited $ 9.58
Non-vested shares at September 30, 2013 $ 9.67