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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | $ 64,739 | $ 82,752 | $ 79,365 | $ 46,186
Total realized and unrealized gains (losses) |  |  |  |
Total foreign exchange losses | 13 | (8) | (8) | (16)
Purchases | (472) | (535) | 19,397 | 13,509
Sales | (548) |  | (10,137) |
Settlements |  |  | (5,739) | 20
Amounts acquired |  |  |  | 19,970
Balance at end of the period | 68,351 | 80,429 | 68,351 | 80,429
Other income (loss) |  |  |  |
Total realized and unrealized gains (losses) |  |  |  |
Included in other income (loss) | 575 | (1,188) | (4,035) | (1,030)
Net realized and unrealized gains on investments |  |  |  |
Total realized and unrealized gains (losses) |  |  |  |
Included in other income (loss) | 4,044 | (592) | (10,492) | 1,790
Other investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 71,450 | 74,810 | 74,634 | 54,545
Total realized and unrealized gains (losses) |  |  |  |
Total foreign exchange losses | 13 | (8) | (8) | (16)
Purchases | 0 | 0 | 20,962 | 17,891
Sales | (548) |  | (10,137) |
Settlements |  |  | 0 | 0
Amounts acquired |  |  |  | 0
Balance at end of the period | 74,959 | 74,210 | 74,959 | 74,210
Other investments | Other income (loss) |  |  |  |
Total realized and unrealized gains (losses) |  |  |  |
Included in other income (loss) | 0 | 0 | 0 |
Other investments | Net realized and unrealized gains on investments |  |  |  |
Total realized and unrealized gains (losses) |  |  |  |
Included in other income (loss) | 4,044 | (592) | (10,492) | 1,790
Other assets and (liabilities) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | (6,711) | 7,942 | 4,731 | (8,359)
Total realized and unrealized gains (losses) |  |  |  |
Total foreign exchange losses | 0 | 0 | 0 | 0
Purchases | (472) | (535) | (1,565) | (4,382)
Sales | 0 |  | 0 |
Settlements |  |  | (5,739) | 20
Amounts acquired |  |  |  | 19,970
Balance at end of the period | (6,608) | 6,219 | (6,608) | 6,219
Other assets and (liabilities) | Other income (loss) |  |  |  |
Total realized and unrealized gains (losses) |  |  |  |
Included in other income (loss) | 575 | (1,188) | (4,035) | (1,030)
Other assets and (liabilities) | Net realized and unrealized gains on investments |  |  |  |
Total realized and unrealized gains (losses) |  |  |  |
Included in other income (loss) | $ 0 | $ 0 | $ 0 |

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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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