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Fair Value of Financial Instruments (Carry Value vs Fair Value) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Available-for-sale Securities |  | $ 3,983,519 | $ 6,509,333
Residential whole loans, at carrying value | [1] | 6,066,345 | 3,016,715
Residential whole loans, at fair value | [1] | 1,381,583 | 1,665,978
MSR related assets |  | 1,217,002 | 611,807
Restricted cash |  | 64,035 | 36,744
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Repurchase agreements |  | 9,139,821 | 7,879,087
Securitized debt |  | 570,952 | 684,420
Convertible Debt |  | 223,971 | 0
Senior Notes |  | 96,862 | 96,816
Carrying value |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
MSR related assets |  | 1,217,002 | 611,807
Cash and cash equivalents |  | 70,629 | 51,965
Restricted cash |  | 64,035 | 36,744
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Repurchase agreements |  | 9,139,821 | 7,879,087
Securitized debt |  | 570,952 | 684,420
Convertible Debt |  | 223,971 | 0
Senior Notes |  | 96,862 | 96,816
Estimated fair value |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
MSR related assets |  | 1,217,002 | 611,807
Cash and cash equivalents |  | 70,629 | 51,965
Restricted cash |  | 64,035 | 36,744
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Repurchase agreements |  | 9,156,209 | 7,896,672
Securitized debt |  | 575,353 | 680,209
Convertible Debt |  | 244,088 | 0
Senior Notes |  | 103,231 | 99,951
Agency MBS |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Available-for-sale Securities |  | 1,664,582 | 2,698,213
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Repurchase agreements |  | 1,557,675 | 2,384,357
Agency MBS | Carrying value |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Available-for-sale Securities |  | 1,664,582 | 2,698,213
Agency MBS | Estimated fair value |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Available-for-sale Securities |  | 1,664,582 | 2,698,213
Non-Agency MBS |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Available-for-sale Securities |  | 2,063,529 | 3,318,299
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Repurchase agreements |  | 1,121,802 | 1,447,585
Non-Agency MBS | Carrying value |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Available-for-sale Securities |  | 2,063,529 | 3,318,299
Non-Agency MBS | Estimated fair value |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Available-for-sale Securities |  | 2,063,529 | 3,318,299
CRT securities |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Available-for-sale Securities |  | 255,408 | 492,821
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Repurchase agreements |  | 203,569 | 391,586
CRT securities | Carrying value |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Available-for-sale Securities |  | 255,408 | 492,821
CRT securities | Estimated fair value |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Available-for-sale Securities |  | 255,408 | 492,821
Residential whole loans, at fair value |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Residential whole loans, at fair value |  | 1,381,583 | 1,665,978
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Repurchase agreements |  | 4,743,094 | 2,020,508
Residential whole loans, at fair value | Carrying value |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Residential whole loans, at carrying value |  | 6,066,345 | 3,016,715
Residential whole loans, at fair value |  | 1,381,583 | 1,665,978
Residential whole loans, at fair value | Estimated fair value |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
Residential whole loans, at carrying value |  | 6,248,745 | 3,104,401
Residential whole loans, at fair value |  | 1,381,583 | $ 1,665,978
Fair Value, Nonrecurring | Carrying value |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |
MSR related assets |  | $ 59,500 |
[1] | Includes approximately $186.4 million and $209.4 million of Residential whole loans, at carrying value and $567.4 million and $694.7 million of Residential whole loans, at fair value transferred to consolidated variable interest entities (“VIEs”) at December 31, 2019 and 2018, respectively. Such assets can be used only to settle the obligations of each respective VIE.

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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