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Repurchase Agreements - Amounts Outstanding and Secured by Assets Pledged as Collateral (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Financial Instruments Owned and Pledged as Collateral [Line Items]
Outstanding Repurchase Agreements		$ 713,364		$ 2,352,102
Fair Value of Collateral Pledged		923,431		2,839,379
Amortized Cost of Collateral Pledged		1,058,609		2,643,541
Proceeds from sale securities		(1,677,506)	$ 141,153
Subsequent Event
Financial Instruments Owned and Pledged as Collateral [Line Items]
Outstanding Repurchase Agreements	$ 248,800
Proceeds from sale securities	(562,900)
Agency RMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Outstanding Repurchase Agreements		0		812,742
Fair Value of Collateral Pledged		0		865,765
Amortized Cost of Collateral Pledged		0		864,428
Agency RMBS | VIE, Primary Beneficiary | Consolidated SLST
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fair value amount				26,200
Agency CMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Outstanding Repurchase Agreements		0		133,184
Fair Value of Collateral Pledged		0		139,317
Amortized Cost of Collateral Pledged		0		140,118
Agency CMBS | VIE, Primary Beneficiary | Consolidated K-Series
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fair value amount				88,400
Non-Agency RMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Outstanding Repurchase Agreements		333,227		594,286
Fair Value of Collateral Pledged		414,605		797,784
Amortized Cost of Collateral Pledged		550,719		785,952
Non-Agency RMBS | Collateral Pledged [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Restricted cash posted as margin		58,300
Non-Agency RMBS | VIE, Primary Beneficiary | Consolidated SLST
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fair value amount		155,400		214,800
CMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Outstanding Repurchase Agreements		380,137		811,890
Fair Value of Collateral Pledged		508,826		1,036,513
Amortized Cost of Collateral Pledged		507,890		853,043
Securities sold pending settlement		199,200
CMBS | Collateral Pledged [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Restricted cash posted as margin		$ 111,200
CMBS | Subsequent Event
Financial Instruments Owned and Pledged as Collateral [Line Items]
Proceeds from sale securities	$ 211,200
CMBS | VIE, Primary Beneficiary | Consolidated K-Series
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fair value amount				$ 848,200

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Amortized Cost Of Collateral Pledged.

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Securities Sold under Agreements to Repurchase, Pending Settlement

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The fair value as of the balance sheet date of financial instruments and other positions owned by the entity and pledged to counterparties as collateral, including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities.

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The cash flow from investments sold under the agreement to repurchase such investment.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

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