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STOCK-BASED COMPENSATION (Restricted Stock Activity) (Details) - Restricted stock units - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Number of Restricted Share Units      
Outstanding at beginning of year (in shares)   1,455,558  
Granted (in shares)   529,907  
Vested (in shares) (79,831) (532,031) (222,043)
Canceled (in shares)   (51,741)  
Outstanding at end of year (in shares) 1,401,693 1,401,693  
Weighted- Average Grant-Date Fair Value      
Outstanding at beginning of year (in dollars per share)   $ 3.64  
Granted (in dollars per share)   4.48  
Vested (in dollars per share)   4.20  
Canceled (in dollars per share)   5.40  
Outstanding at end of year (in dollars per share) $ 4.53 $ 4.53