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Fair Value of Financial Instruments - Valuation for Level 3 Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 12,503,064	$ 9,835,319
Total (losses)/gains (realized/unrealized)
Included in earnings	291,335	(182,601)
Included in other comprehensive income (loss)	(13,665)	(4)
Transfers in	0	0
Transfers out	(182)	0
Contributions	0	0
Paydowns/Distributions	(62,726)	(38,530)
Sales	(63,217)	0
Purchases	2,585,868	15,966
Balance at the end of period	15,240,477	9,630,150
Assets of consolidated VIEs	14,450,531		$ 11,984,374
Consolidated K-Series
Total (losses)/gains (realized/unrealized)
Assets of consolidated VIEs	2,400,000
Multi-family loans held in securitization trusts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	11,679,847	9,657,421
Total (losses)/gains (realized/unrealized)
Included in earnings	259,764	(184,678)
Included in other comprehensive income (loss)	0	0
Transfers in	0	0
Transfers out	0	0
Contributions	0	0
Paydowns/Distributions	(37,485)	(34,434)
Sales	0	0
Purchases	2,426,210	0
Balance at the end of period	14,328,336	9,438,309
Distressed and other residential mortgage loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	737,523	87,153
Total (losses)/gains (realized/unrealized)
Included in earnings	9,945	(181)
Included in other comprehensive income (loss)	0	0
Transfers in	0	0
Transfers out	(182)	0
Contributions	0	0
Paydowns/Distributions	(24,930)	(3,458)
Sales	(6,448)	0
Purchases	159,658	15,966
Balance at the end of period	875,566	99,480
Investments in unconsolidated entities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	32,994	42,823
Total (losses)/gains (realized/unrealized)
Included in earnings	3,892	1,319
Included in other comprehensive income (loss)	0	0
Transfers in	0	0
Transfers out	0	0
Contributions	0	0
Paydowns/Distributions	(311)	(638)
Sales	0	0
Purchases	0	0
Balance at the end of period	36,575	43,504
CMBS held in securitization trusts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	52,700	47,922
Total (losses)/gains (realized/unrealized)
Included in earnings	17,734	939
Included in other comprehensive income (loss)	(13,665)	(4)
Transfers in	0	0
Transfers out	0	0
Contributions	0	0
Paydowns/Distributions	0	0
Sales	(56,769)	0
Purchases	0	0
Balance at the end of period	$ 0	$ 48,857

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

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