Investments - Equity Method Investments (Details) - USD ($) $ in Thousands |
Jun. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Schedule of Equity Method Investments [Line Items] | ||
| Carrying Value | $ 60,113 | $ 39,886 |
| % of Total | 100.00% | 100.00% |
| Remaining unfunded commitments on equity method investments | $ 66,351 | $ 63,313 |
| Hedge fund investments | ||
| Schedule of Equity Method Investments [Line Items] | ||
| Carrying Value | $ 33,058 | $ 29,435 |
| % of Total | 55.00% | 73.80% |
| Investment in limited partnerships | ||
| Schedule of Equity Method Investments [Line Items] | ||
| Carrying Value | $ 27,055 | $ 10,451 |
| % of Total | 45.00% | 26.20% |
| Remaining unfunded commitments on equity method investments | $ 9,842 | $ 326 |
| Equity Method Investments | ||
| Schedule of Equity Method Investments [Line Items] | ||
| Remaining unfunded commitments on equity method investments | $ 45,691 |