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Fair Value of Financial Instruments - Valuation for Level 3 Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 11,022,248	$ 9,189,459
Total losses (gains) (realized/unrealized)
Included in earnings	237,789	(201,558)
Purchases	2,324,639	0
Paydowns	(37,481)	(34,434)
Balance at the end of period	13,547,195	$ 8,953,467
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities of consolidated VIEs	13,647,045		$ 11,191,736
Consolidated K-Series
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities of consolidated VIEs	$ 2,300,000

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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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Amount of settlements 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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