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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | $ 75,151 | $ 64,739 | $ 73,596 | $ 79,365
Total realized and unrealized losses |  |  |  |
Total foreign exchange losses | (9) | 13 | (5) | (8)
Purchases | 124 | (472) | 4,606 | 19,397
Sales | 0 | (548) | (946) | (10,137)
Settlements | 0 |  | 0 | (5,739)
Balance at end of the period | 79,066 | 68,351 | 79,066 | 68,351
Net realized and unrealized (losses) gains on investments |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other income (loss) | 3,252 | 4,044 | 731 | (10,492)
Other income (loss) |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other income (loss) | 548 | 575 | 1,084 | (4,035)
Other investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 81,344 | 71,450 | 79,807 | 74,634
Total realized and unrealized losses |  |  |  |
Total foreign exchange losses | (9) | 13 | (5) | (8)
Purchases | 0 | 0 | 5,000 | 20,962
Sales | 0 | (548) | (946) | (10,137)
Settlements | 0 |  | 0 | 0
Balance at end of the period | 84,587 | 74,959 | 84,587 | 74,959
Other investments | Net realized and unrealized (losses) gains on investments |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other income (loss) | 3,252 | 4,044 | 731 | (10,492)
Other investments | Other income (loss) |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other income (loss) | 0 | 0 | 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 | (6,193) | (6,711) | (6,211) | 4,731
Total realized and unrealized losses |  |  |  |
Total foreign exchange losses | 0 | 0 | 0 | 0
Purchases | 124 | (472) | (394) | (1,565)
Sales | 0 | 0 | 0 | 0
Settlements | 0 |  | 0 | (5,739)
Balance at end of the period | (5,521) | (6,608) | (5,521) | (6,608)
Other assets and (liabilities) | Net realized and unrealized (losses) gains on investments |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other income (loss) | 0 | 0 | 0 | 0
Other assets and (liabilities) | Other income (loss) |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other income (loss) | $ 548 | $ 575 | $ 1,084 | $ (4,035)

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