Investment in Loans Investment in Loans (Schedule of Corporate Loans) (Details) - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
Sep. 30, 2021 |
Dec. 31, 2020 |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Unpaid Principal Balance | $ 1,940,279 | $ 1,417,054 | ||||
| Loans, at fair value | [1],[2] | 1,996,529 | 1,453,480 | |||
| Corporate loan [Member] | ||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Unpaid Principal Balance | 16,828 | 5,855 | ||||
| Loans, at fair value | $ 16,561 | $ 5,855 | ||||
| Weighted Average | ||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Weighted Average Coupon | 3.63% | 3.92% | ||||
| Weighted average life | 5 years 11 months 4 days | 4 years 5 months 26 days | ||||
| Weighted Average | Corporate loan [Member] | ||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Weighted Average Coupon | 17.68% | 20.00% | ||||
| Weighted average life | 2 years 10 months 28 days | 1 year 9 months | ||||
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