Investment in Loans Investment in Loans (Schedule of Corporate Loans) (Details) - USD ($) $ in Thousands |
12 Months Ended | |||||
|---|---|---|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Unpaid Principal Balance | $ 1,417,054 | $ 1,387,733 | ||||
| Loans, at fair value | [1],[2] | 1,453,480 | 1,412,426 | |||
| Corporate loan [Member] | ||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Unpaid Principal Balance | 5,855 | 18,415 | ||||
| Loans, at fair value | $ 5,855 | $ 18,510 | ||||
| Weighted Average | ||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Weighted Average Coupon | 3.92% | 4.23% | ||||
| Weighted average life | 4 years 5 months 26 days | 5 years 10 months 24 days | ||||
| Weighted Average | Corporate loan [Member] | ||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Weighted Average Coupon | 20.00% | 17.62% | ||||
| Weighted average life | 1 year 9 months | 10 months 13 days | ||||
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