Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY (Details 2)

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STOCKHOLDERS' EQUITY (Details 2) (Restricted Stock Units (RSUs) [Member], USD $)
6 Months Ended
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
 
Unvested restricted stock activity  
Balance outstanding at the beginning of the period (in shares) 2,454
Forfeited (in shares) (79)
Vested (in shares) (674)
Granted (in shares) 411
Balance outstanding at the end of the period (in shares) 2,112
Weighted-Average Grant-Date Fair Value  
Balance at the beginning of the period (in dollars per share) $ 18.75
Forfeited (in dollars per share) $ 21.60
Vested (in dollars per share) $ 15.42
Granted (in dollars per share) $ 28.74
Balance at the end of the period (in dollars per share) $ 21.64