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STOCK-BASED COMPENSATION - Non-vested restricted shares activity (Details 1) - 6 months ended Jun. 30, 2015 - Restricted Stock - $ / shares
Total
Shares  
Non-vested shares at December 31, 2014 3,575,150
Granted 895,725
Vested (1,054,625)
Forfeited (77,950)
Non-vested shares at June 30, 2015 3,338,300
Weighted Average Grant-Date Fair Value  
Non-vested shares at December 31, 2014 $ 12.04
Granted 12.30
Vested 8.66
Forfeited 12.87
Non-vested shares at June 30, 2015 $ 13.16