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FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Realized loss $ 5,094      
Senior secured notes, carrying value   $ 140,000 $ 150,000  
Senior secured notes, fair value $ 0     $ 12,406
Senior secured notes | Investor        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Senior secured notes, carrying value   140,000    
Senior secured notes, fair value   $ 106,050