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Fair Value of Financial Instruments - Valuation for Level 3 Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 9,189,459	$ 6,624,896	$ 6,818,901
Total losses (realized/unrealized)
Included in earnings	(211,738)	(82,650)	(57,687)
Purchases	2,182,330	2,784,377	0
Paydowns	(137,803)	(137,164)	(136,318)
Balance at the end of period	11,022,248	9,189,459	$ 6,624,896
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities of consolidated VIEs	11,191,736	9,436,421
Consolidated K-Series
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities of consolidated VIEs	$ 2,200,000	$ 2,800,000

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Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

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