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Fair Value of Financial Instruments (Fair Value Methodology) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Residential whole loans, at fair value | $ 1,243,542 |  | $ 1,381,113
Purchases excluded from level 2 fair value | 250 |  | 470
Discounted cash flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Residential whole loans, at fair value | 745,726 |  | 829,842
Liquidation model |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Residential whole loans, at fair value | 497,816 |  | 551,271
Simple average amount | $ 368 |  | $ 365
Residential whole loans, at fair value | Level 3 | Liquidation model | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Annual change in home prices | (0.50%) | 2.40% |
Liquidation timeline (in years) | 1 month 6 days | 1 month 6 days |
Current value of underlying properties | $ 5 | $ 10 |
Residential whole loans, at fair value | Level 3 | Liquidation model | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Annual change in home prices | 6.90% | 8.00% |
Liquidation timeline (in years) | 4 years 9 months 18 days | 4 years 6 months |
Current value of underlying properties | $ 4,500 | $ 4,500 |
Discount rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.051 |  | 0.038
Discount rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.097 |  | 0.080
Discount rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.056 |  | 0.042
Discount rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.062 |  | 0.065
Discount rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.500 |  | 0.500
Discount rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.086 |  | 0.080
Prepayment rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.001 |  | 0.007
Prepayment rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.199 |  | 0.180
Prepayment rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.052 |  | 0.045
Prepayment rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Annual change in home prices | 2.50% |  | 3.70%
Default rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.000 |  | 0.000
Default rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.235 |  | 0.230
Default rate | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.039 |  | 0.040
Default rate | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liquidation timeline (in years) | 1 year 10 months 24 days |  | 1 year 9 months 18 days
Loss severity | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.000 |  | 0.000
Loss severity | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 1.000 |  | 1.000
Loss severity | Residential whole loans, at fair value | Level 3 | Discounted cash flow | Weighted Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.130 |  | 0.129
Loss severity | Residential whole loans, at fair value | Level 3 | Liquidation model | Weighted Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current value of underlying properties | $ 709 |  | $ 684

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