Investment in Loans (Schedule of Consumer Loans) (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2020 |
Dec. 31, 2019 |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Unpaid Principal Balance | $ 1,441,017 | $ 1,387,733 | ||
| Unamortized Premium (Discount) | (174,092) | (150,821) | ||
| Loans, at fair value | [1] | $ 1,443,589 | $ 1,412,426 | |
| Weighted Average | ||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Weighted average life | 4 years 5 months 12 days | 5 years 10 months 24 days | ||
| Consumer loans | ||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Unpaid Principal Balance | $ 190,705 | $ 179,743 | ||
| Unamortized Premium (Discount) | 7,684 | 5,027 | ||
| Amortized Cost | 198,389 | 184,770 | ||
| Gains | 937 | 2,561 | ||
| Losses | (4,523) | (377) | ||
| Loans, at fair value | $ 194,803 | $ 186,954 | ||
| Consumer loans | Weighted Average | ||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Weighted average life | 10 months 17 days | 9 months 25 days | ||
| Delinquency (Days) | 4 days | 4 days | ||
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