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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) - Significant Unobservable Inputs (Level 3) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 79,365 | $ 46,186
Total realized and unrealized losses |  |
Total foreign exchange gains | 10 | 5
Purchases | 18,950 | 13,405
Sales | (10,137) |
Settlements | (5,739) | 20
Amounts acquired |  | 19,970
Ending balance | 73,596 | 79,365
Other income (loss) |  |
Total realized and unrealized losses |  |
Included in other income | (3,191) | (2,347)
Net realized and unrealized (losses) gains on investments |  |
Total realized and unrealized losses |  |
Included in other income | (5,662) | 2,126
Other Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 74,634 | 54,545
Total realized and unrealized losses |  |
Total foreign exchange gains | 10 | 5
Purchases | 20,962 | 17,958
Sales | (10,137) |
Settlements | 0 | 0
Amounts acquired |  | 0
Ending balance | 79,807 | 74,634
Other Investments | Other income (loss) |  |
Total realized and unrealized losses |  |
Included in other income | 0 | 0
Other Investments | Net realized and unrealized (losses) gains on investments |  |
Total realized and unrealized losses |  |
Included in other income | (5,662) | 2,126
Other Assets and (Liabilities) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 4,731 | (8,359)
Total realized and unrealized losses |  |
Total foreign exchange gains | 0 | 0
Purchases | (2,012) | (4,553)
Sales | 0 |
Settlements | (5,739) | 20
Amounts acquired |  | 19,970
Ending balance | (6,211) | 4,731
Other Assets and (Liabilities) | Other income (loss) |  |
Total realized and unrealized losses |  |
Included in other income | (3,191) | (2,347)
Other Assets and (Liabilities) | Net realized and unrealized (losses) gains on investments |  |
Total realized and unrealized losses |  |
Included in other income | $ 0 | $ 0

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- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Amounts Acquired + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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