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Fair Value of Financial Instruments (Carry Value vs Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Residential whole loans, at carrying value $ 4,195,332 $ 6,069,370 [1]
Residential whole loans, at fair value 1,216,902 1,381,583
Fair Value 161,000 3,983,519
MSR-related assets 238,999 1,217,002
Restricted cash 7,165 64,035
Carrying value    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
MSR-related assets 238,999 1,217,002
Cash and cash equivalents 814,354 70,629
Restricted cash 7,165 64,035
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Financing agreements with mark-to-market collateral provisions 1,124,162 4,741,971
Securitized debt 1,514,509 570,952
Convertible senior notes 225,177 223,971
Senior notes (4) 100,000 96,862
Estimated fair value    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
MSR-related assets 238,999 1,217,002
Cash and cash equivalents 814,354 70,629
Restricted cash 7,165 64,035
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Financing agreements with mark-to-market collateral provisions 1,124,162 4,753,070
Securitized debt 1,519,567 575,353
Convertible senior notes 228,287 244,088
Senior notes (4) 100,031 103,231
Residential whole loans    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Residential whole loans, at fair value 1,216,902 1,381,583
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Financing agreements with mark-to-market collateral provisions 1,124,162 4,743,094
Residential whole loans | Carrying value    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Residential whole loans, at carrying value 4,108,499 6,069,370
Residential whole loans, at fair value 1,216,902 1,381,583
Residential whole loans | Estimated fair value    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Residential whole loans, at carrying value 4,282,401 6,248,745
Residential whole loans, at fair value 1,216,902 1,381,583
Non-Agency MBS    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fair Value 56,766 2,063,529
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Financing agreements with mark-to-market collateral provisions 1,282 1,121,802
Non-Agency MBS | Carrying value    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fair Value 56,766 2,063,529
Non-Agency MBS | Estimated fair value    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fair Value 56,766 2,063,529
Agency MBS    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fair Value   1,664,582
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Financing agreements with mark-to-market collateral provisions 0 1,557,675
Agency MBS | Carrying value    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fair Value 0 1,664,582
Agency MBS | Estimated fair value    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fair Value 0 1,664,582
CRT securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fair Value 104,234 255,408
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Financing agreements with mark-to-market collateral provisions 54,883 203,569
CRT securities | Carrying value    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fair Value 104,234 255,408
CRT securities | Estimated fair value    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Fair Value 104,234 255,408
Financing agreements with non-mark-to-market collateral provisions    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Financing agreements with mark-to-market collateral provisions 252,747 0
Financing agreements with non-mark-to-market collateral provisions | Carrying value    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Financing agreements 1,159,213 0
Financing agreements with non-mark-to-market collateral provisions | Estimated fair value    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Financing agreements 1,159,213 0
Financing agreements with mark-to-market collateral provisions | Carrying value    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Financing agreements 213,915 4,397,850
Financing agreements with mark-to-market collateral provisions | Estimated fair value    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Financing agreements $ 213,915 4,403,139
Fair Value, Nonrecurring | Carrying value    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
MSR-related assets   $ 59,500
[1] For the year ended December 31, 2020, includes approximately $2.7 million (360,534 shares) surrendered for tax purposes related to equity-based compensation awards. For the year ended December 31, 2019, includes approximately $4.1 million (562,815 shares) surrendered for tax purposes related to equity-based compensation awards. For the year ended December 31, 2018, includes approximately $3.4 million (464,429 shares) surrendered for tax purposes related to equity-based compensation awards.