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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) - Fair Value (Level 3) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | $ 158,496 | $ 73,596
Total foreign exchange losses | (10) | 3
Purchases | 9,719 | (306)
Settlements | (455) |
Balance at end of the period | 161,114 | 69,453
Net investment income |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 605 |
Net realized and unrealized gains (losses) on investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | (8,150) | (3,936)
Other income (loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 909 | 96
Direct private equity investment |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | 88,373 | 79,807
Total foreign exchange losses | (10) | 3
Purchases | 0 | 0
Settlements | 0 |
Balance at end of the period | 80,213 | 75,874
Direct private equity investment | Net investment income |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 0 |
Direct private equity investment | Net realized and unrealized gains (losses) on investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | (8,150) | (3,936)
Direct private equity investment | Other income (loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 0 | 0
Term loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | 74,850 | 0
Total foreign exchange losses | 0 | 0
Purchases | 10,000 | 0
Settlements | (455) |
Balance at end of the period | 85,000 | 0
Term loans | Net investment income |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 605 |
Term loans | Net realized and unrealized gains (losses) on investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 0 | 0
Term loans | Other income (loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 0 | 0
Other assets and (liabilities) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | (4,727) | (6,211)
Total foreign exchange losses | 0 | 0
Purchases | (281) | (306)
Settlements | 0 |
Balance at end of the period | (4,099) | (6,421)
Other assets and (liabilities) | Net investment income |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 0 |
Other assets and (liabilities) | Net realized and unrealized gains (losses) on investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 0 | 0
Other assets and (liabilities) | Other income (loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | $ 909 | $ 96

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