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Fair Value of Financial Instruments (Fair Value Hierarchy) (Details) - USD ($)		Mar. 31, 2020	Dec. 31, 2019
Assets:
Residential whole loans, at fair value	[1]	$ 1,243,792,000	$ 1,381,583,000
Available-for-sale securities		1,927,454,000	3,983,519,000
Total assets carried at fair value		3,877,854,000	6,522,565,000
Residential whole loans, at fair value
Assets:
Residential whole loans, at fair value		1,243,792,000	1,381,583,000
Non-Agency MBS
Assets:
Available-for-sale securities		1,119,940,000	2,063,529,000
Agency MBS
Assets:
Available-for-sale securities		553,413,000	1,664,582,000
CRT securities
Assets:
Available-for-sale securities		254,101,000	255,408,000
Term notes backed by MSR-related collateral
Assets:
Term notes backed by MSR related collateral		706,608,000	1,157,463,000
Level 1
Assets:
Total assets carried at fair value		0	0
Level 1 | Residential whole loans, at fair value
Assets:
Residential whole loans, at fair value		0	0
Level 1 | Non-Agency MBS
Assets:
Available-for-sale securities		0	0
Level 1 | Agency MBS
Assets:
Available-for-sale securities		0	0
Level 1 | CRT securities
Assets:
Available-for-sale securities		0	0
Level 1 | Term notes backed by MSR-related collateral
Assets:
Term notes backed by MSR related collateral		0	0
Level 2
Components of financial instruments carried at fair value
Credit valuation adjustment to derivative liabilities		0
Credit valuation adjustment to derivative assets		0
Assets:
Total assets carried at fair value		2,634,062,000	5,140,982,000
Level 2 | Residential whole loans, at fair value
Assets:
Residential whole loans, at fair value		0	0
Level 2 | Non-Agency MBS
Assets:
Available-for-sale securities		1,119,940,000	2,063,529,000
Level 2 | Agency MBS
Assets:
Available-for-sale securities		553,413,000	1,664,582,000
Level 2 | CRT securities
Assets:
Available-for-sale securities		254,101,000	255,408,000
Level 2 | Term notes backed by MSR-related collateral
Assets:
Term notes backed by MSR related collateral		706,608,000	1,157,463,000
Level 3
Assets:
Total assets carried at fair value		1,243,792,000	1,381,583,000
Level 3 | Residential whole loans, at fair value
Assets:
Residential whole loans, at fair value		1,243,792,000	1,381,583,000
Level 3 | Non-Agency MBS
Assets:
Available-for-sale securities		0	0
Level 3 | Agency MBS
Assets:
Available-for-sale securities		0	0
Level 3 | CRT securities
Assets:
Available-for-sale securities		0	0
Level 3 | Term notes backed by MSR-related collateral
Assets:
Term notes backed by MSR related collateral		$ 0	$ 0
[1] Includes approximately $185.9 million and $186.4 million of Residential whole loans, at carrying value and $516.4 million and $567.4 million of Residential whole loans, at fair value transferred to consolidated variable interest entities (“VIEs”) at March 31, 2020 and December 31, 2019, respectively. Such assets can be used only to settle the obligations of each respective VIE

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