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Fair Value - Schedule of Changes in Fair Value of Financial Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs (Details) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 0
Purchases 549,942
Distributions (654)
Unrealized (gain) loss (26,355)
Ending balance $ 522,933