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Fair Value of Financial Instruments - Valuation for Level 3 Assets (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 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 (280,300) 38,978  
Included in other comprehensive income 901 208  
Contributions 0 1,300  
Paydowns/Distributions (133,101) (139,751)  
Sales (7,105) (4,100)  
Purchases 923,842 1,598,018  
Balance at the end of period 10,339,556 8,556,495  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Assets of consolidated VIEs 10,381,126   $ 10,041,468
Consolidated K-Series      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Assets of consolidated VIEs $ 800,000 $ 1,500,000