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STOCK-BASED COMPENSATION Restricted Stock Units (Details) (Restricted Stock Units (RSUs) [Member], USD $)
9 Months Ended
Sep. 30, 2013
Number of Shares/Units:  
Unvested at December 31, 2012 584,000
Granted 670,500
Granted - option exchange program 545,136
Vested (235,500)
Forfeited (103,775)
Unvested at September 30, 2013 1,460,361
Weighted-Average Grant Date Fair Value:  
Unvested at December 31, 2012 $ 5.61
Granted $ 2.60
Granted - option exchange program $ 3.27
Vested $ 5.48
Forfeited $ 4.67
Unvested at September 30, 2013 $ 3.72
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Unvested, Intrinsic Value $ 7,700,000
Unrecognized compensation expense 8,200,000
Weighted average period for recognition 2 years 8 months 20 days
Scenario, Accelerated [Member]
 
Weighted-Average Grant Date Fair Value:  
Unrecognized compensation expense $ 1,900,000
Minimum [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period (in years) 1 year
Maximum [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period (in years) 4 years