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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 | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | $ 69,453 | $ 73,843 | $ 73,596 | $ 79,365
Total realized and unrealized losses |  |  |  |
Total foreign exchange gains | 1 |  | 4 | (21)
Purchases | 4,788 | (482) | 4,482 | 19,869
Sales | (946) | (790) | (946) | (9,589)
Settlements | 0 | (5,739) | 0 | (5,739)
Balance at end of the period | 75,151 | 64,739 | 75,151 | 64,739
Net realized and unrealized gains (losses) on investments |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other income (loss) | 1,415 | (380) | (2,521) | (14,536)
Other income (loss) |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other income (loss) | 440 | (1,713) | 536 | (4,610)
Other investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 75,874 | 72,620 | 79,807 | 74,634
Total realized and unrealized losses |  |  |  |
Total foreign exchange gains | 1 |  | 4 | (21)
Purchases | 5,000 | 0 | 5,000 | 20,962
Sales | (946) | (790) | (946) | (9,589)
Settlements | 0 | 0 | 0 | 0
Balance at end of the period | 81,344 | 71,450 | 81,344 | 71,450
Other investments | Net realized and unrealized gains (losses) on investments |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other income (loss) | 1,415 | (380) | (2,521) | (14,536)
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 | (6,421) | 1,223 | (6,211) | 4,731
Total realized and unrealized losses |  |  |  |
Total foreign exchange gains | 0 |  | 0 | 0
Purchases | (212) | (482) | (518) | (1,093)
Sales | 0 | 0 | 0 | 0
Settlements | 0 | (5,739) | 0 | (5,739)
Balance at end of the period | (6,193) | (6,711) | (6,193) | (6,711)
Other assets and (liabilities) | Net realized and unrealized gains (losses) 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) | $ 440 | $ (1,713) | $ 536 | $ (4,610)

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