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Fair Value of Financial Instruments (Carrying Value vs Fair Value) (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Financial Assets:
Residential whole loans, carrying value	[1]	$ 3,932,300	$ 4,195,332
Residential whole loans, at fair value	[1]	1,320,199	1,216,902
Restricted cash		5,150	7,165
Carrying Value
Financial Assets:
MSR-related assets		350,115	399,999
Cash and cash equivalents		780,714	814,354
Restricted cash		5,150	7,165
Financial Liabilities:
Securitized debt		1,548,920	1,514,509
Convertible senior notes		225,492	225,177
Senior notes		0	100,000
Estimated Fair Value
Financial Assets:
MSR-related assets		350,115	399,999
Cash and cash equivalents		780,714	814,354
Restricted cash		5,150	7,165
Financial Liabilities:
Securitized debt		1,552,493	1,519,567
Convertible senior notes		232,042	228,287
Senior notes		0	100,031
Residential whole loans, at fair value
Financial Assets:
Residential whole loans, at fair value		1,320,199	1,216,902
Residential whole loans, at fair value | Carrying Value
Financial Assets:
Residential whole loans, carrying value		3,869,056	4,108,499
Residential whole loans, at fair value		1,320,199	1,216,902
Residential whole loans, at fair value | Estimated Fair Value
Financial Assets:
Residential whole loans, carrying value		4,072,021	4,282,401
Residential whole loans, at fair value		1,320,199	1,216,902
Financing agreements with non-mark-to-market collateral provisions | Carrying Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		1,041,283	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		1,041,283	1,159,213
Financing agreements with mark-to-market collateral provisions | Carrying Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		979,541	1,124,162
Financing agreements with mark-to-market collateral provisions | Estimated Fair Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		979,541	1,124,162
Financing agreements with mark-to-market collateral provisions | Carrying Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		200,746	213,915
Financing agreements with mark-to-market collateral provisions | Estimated Fair Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		$ 200,746	$ 213,915
[1] Includes approximately $1.5 billion and $1.4 billion of Residential whole loans, at carrying value and $311.6 million and $382.3 million of Residential whole loans, at fair value transferred to consolidated variable interest entities (“VIEs”) at March 31, 2021 and December 31, 2020, respectively. Such assets can be used only to settle the obligations of each respective VIE.

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