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]
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Unvested restricted stock activity  
Balance outstanding at the beginning of the period (in shares) | shares 2,261
Forfeited (in shares) | shares (26)
Vested (in shares) | shares (642)
Granted (in shares) | shares 448
Balance outstanding at the end of the period (in shares) | shares 2,041
Weighted-Average Grant-Date Fair Value  
Balance at the beginning of the period (in dollars per share) | $ / shares $ 20.21
Forfeited (in dollars per share) | $ / shares 23.44
Vested (in dollars per share) | $ / shares 21.82
Granted (in dollars per share) | $ / shares 33.80
Balance at the end of the period (in dollars per share) | $ / shares $ 24.19