Investment in Loans (Schedule of Investments in Loans) (Details) - USD ($) $ in Thousands |
Sep. 30, 2022 |
Dec. 31, 2021 |
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|---|---|---|---|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Current Principal/Notional Amount | $ 4,073,065 | $ 2,366,724 | ||||
| Fair Value | [1],[2] | 3,822,895 | 2,415,321 | |||
| Residential mortgage loans | ||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Current Principal/Notional Amount | 3,597,404 | 1,969,874 | ||||
| Fair Value | 3,348,810 | 2,016,228 | ||||
| Commercial mortgage loans | ||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Current Principal/Notional Amount | 465,924 | 326,438 | ||||
| Fair Value | 464,513 | 326,197 | ||||
| Consumer loans | ||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Current Principal/Notional Amount | 6,203 | 59,881 | ||||
| Fair Value | 6,038 | 62,365 | ||||
| Corporate loan [Member] | ||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Current Principal/Notional Amount | 3,534 | 10,531 | ||||
| Fair Value | $ 3,534 | $ 10,531 | ||||
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