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Fair Value of Financial Instruments - Valuation for Level 3 Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 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 gains/(losses) (realized/unrealized)
Included in earnings	623,077	(239,166)
Included in other comprehensive income (loss)	(13,665)	297
Transfers in	0	0
Transfers out	(182)	0
Contributions	50,000	0
Paydowns/Distributions	(168,277)	(78,497)
Sales	(76,583)	(2,185)
Purchases	2,806,553	94,075
Balance at the end of period	15,723,987	9,609,843
Assets of consolidated VIEs	14,691,481		$ 11,984,374
Consolidated K-Series
Total gains/(losses) (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 gains/(losses) (realized/unrealized)
Included in earnings	574,231	(244,181)
Included in other comprehensive income (loss)	0	0
Transfers in	0	0
Transfers out	0	0
Contributions	0	0
Paydowns/Distributions	(106,363)	(67,880)
Sales	0	0
Purchases	2,426,210	0
Balance at the end of period	14,573,925	9,345,360
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 gains/(losses) (realized/unrealized)
Included in earnings	25,359	(475)
Included in other comprehensive income (loss)	0	0
Transfers in	0	0
Transfers out	(182)	0
Contributions	0	0
Paydowns/Distributions	(61,275)	(9,371)
Sales	(19,814)	(2,185)
Purchases	380,343	94,075
Balance at the end of period	1,061,954	169,197
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 gains/(losses) (realized/unrealized)
Included in earnings	5,753	3,575
Included in other comprehensive income (loss)	0	0
Transfers in	0	0
Transfers out	0	0
Contributions	50,000	0
Paydowns/Distributions	(639)	(1,246)
Sales	0	0
Purchases	0	0
Balance at the end of period	88,108	45,152
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 gains/(losses) (realized/unrealized)
Included in earnings	17,734	1,915
Included in other comprehensive income (loss)	(13,665)	297
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	$ 50,134

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Contributions

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of 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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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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

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