Other Investments - Components of Other Debt Investments, Net (Details) - USD ($) $ in Thousands |
Sep. 30, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Equity Method Investments and Joint Ventures [Abstract] | ||
| Cost basis | $ 110,893 | $ 102,878 |
| Discount | (10,243) | (10,309) |
| Allowance for credit losses | (2,415) | 0 |
| Total other debt investments, net | $ 98,235 | $ 92,569 |