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Fair Value of Financial Instruments - Valuation for Level 3 Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period $ 9,835,319 $ 7,061,842  
Total (losses)/gains (realized/unrealized)      
Included in earnings (182,601) 3,340  
Included in other comprehensive income (loss) (4) (193)  
Contributions 0 1,300  
Paydowns/Distributions (38,530) (38,425)  
Purchases 15,966 1,545,030  
Balance at the end of period 9,630,150 8,572,894  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Assets of consolidated VIEs $ 9,771,205   $ 10,041,468
Consolidated K-Series      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Assets of consolidated VIEs   $ 1,500,000