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Fair Value of Financial Instruments (Details 4) - Recurring basis - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Significant unobservable inputs used in our recurring Level 3 fair value measurements    
Derivative liabilities $ 2,012 $ 1,232
Significant Unobservable Inputs (Level 3) | Derivative Liabilities    
Significant unobservable inputs used in our recurring Level 3 fair value measurements    
Derivative liabilities $ 2,012 $ 1,232
Significant Unobservable Inputs (Level 3) | Derivative Liabilities | Discounted cash flows | Weighted average    
Significant unobservable inputs used in our recurring Level 3 fair value measurements    
Constant prepayment rate 14.81% 10.60%
Default rate 0.30% 0.50%
Reference STACR credit spread 3.69% 3.93%