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Fair Value of Financial Instruments (Carrying Value vs Fair Value) (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Financial Assets:
Securities, at fair value	[1]	$ 283,037	$ 399,999
Restricted cash		55,507	7,165
Carrying Value
Financial Assets:
Securities, at fair value		283,037	399,999
Cash and cash equivalents		526,241	814,354
Restricted cash		55,507	7,165
Financial Liabilities:
Securitized debt		2,045,729	1,514,509
Convertible senior notes		226,138	225,177
Senior notes		0	100,000
Estimated Fair Value
Financial Assets:
Securities, at fair value		283,037	399,999
Cash and cash equivalents		526,241	814,354
Restricted cash		55,507	7,165
Financial Liabilities:
Securitized debt		2,053,714	1,519,567
Convertible senior notes		234,328	228,287
Senior notes		0	100,031
Residential whole loans | Carrying Value
Financial Assets:
Residential whole loans, carrying value		7,081,462	5,325,401
Residential whole loans | Estimated Fair Value
Financial Assets:
Residential whole loans, carrying value		7,280,297	5,499,303
Financing agreements with non-mark-to-market collateral provisions | Carrying Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		847,949	1,159,213
Financing agreements with non-mark-to-market collateral provisions | Estimated Fair Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		848,367	1,159,213
Agreements with mark-to-market collateral provisions | Carrying Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		2,259,188	1,124,162
Agreements with mark-to-market collateral provisions | Estimated Fair Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		2,259,332	1,124,162
Financing agreements with mark-to-market collateral provisions | Carrying Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		171,804	213,915
Financing agreements with mark-to-market collateral provisions | Estimated Fair Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		$ 171,804	$ 213,915
[1] See Note 6 for information regarding the Company’s pledged assets.

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