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Fair Value of Financial Instruments - Level 3 Reconciliation (Details) - OPP - Significant Unobservable Inputs Level 3
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 14,300
Fair value adjustment (1,900)
Ending balance $ 12,400