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Fair Value of Financial Instruments - Valuation for Level 3 Assets (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 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 (239,166) 62,607  
Included in other comprehensive income (loss) 297 (144)  
Contributions 0 1,300  
Paydowns/Distributions (78,497) (71,778)  
Sales (2,185) 0  
Purchases 94,075 1,554,450  
Balance at the end of period 9,609,843 8,608,277  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Assets of consolidated VIEs $ 9,663,179   $ 10,041,468
Consolidated K-Series      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Assets of consolidated VIEs   $ 1,500,000