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Fair Value of Financial Instruments - Valuation for Level 3 Assets (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 28, 2015	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		$ 7,214,587	$ 7,061,842	$ 7,214,587	$ 8,442,604
Total (losses)/gains (realized/unrealized)
Included in earnings			(17,841)	(19,495)	(90,662)
Included in other comprehensive income (loss)			602	224	(360)
Transfers in			0	52,176	0
Transfers out			0	(56,756)	0
Contributions		3,200	2,500		26,461
Paydowns/Distributions			(176,037)	(150,824)	(88,874)
Sales			(7,224)	0	(1,075,529)
Purchases			2,971,477	18,730	947
Balance at the end of period			9,835,319	7,061,842	7,214,587
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets of consolidated VIEs			10,041,468	7,330,872
Consolidated K-Series
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets of consolidated VIEs			2,900,000
PO Security
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sale of investments	$ 44,300
Gain on sale of investments	1,500
Multi-family loans held in securitization trusts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deconsolidation	1,100,000	$ 0	0		1,075,529
Multi-family collateralized debt obligations, at fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deconsolidation	$ 1,000,000		$ 0	$ 0	$ 1,009,942

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