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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Total realized and unrealized gains (losses) |  |  |  |
Amounts acquired |  |  | $ 19,970 |
Other assets and (liabilities) |  |  |  |
Total realized and unrealized gains (losses) |  |  |  |
Amounts acquired |  |  | 19,970 |
Fair Value (Level 3) | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | $ 75,522 |  | 46,186 |
Total realized and unrealized gains (losses) |  |  |  |
Purchases | 4,679 |  | 14,044 |
Sales | 0 |  |  |
Settlements | 0 |  | 20 |
Balance at end of the period | 82,752 |  | 82,752 |
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other income (loss) |  |  |  |
Total realized and unrealized gains (losses) |  |  |  |
Included in other income (loss) | 2,558 |  | 2,540 |
Total foreign exchange losses | (7) |  | (8) |
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 63,695 |  | 54,545 |
Total realized and unrealized gains (losses) |  |  |  |
Purchases | 7,629 |  | 17,891 |
Sales | 0 |  |  |
Settlements | 0 |  | 0 |
Amounts acquired |  |  | 0 |
Balance at end of the period | 74,810 |  | 74,810 |
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other investments | Other income (loss) |  |  |  |
Total realized and unrealized gains (losses) |  |  |  |
Included in other income (loss) | 3,493 |  | 2,382 |
Total foreign exchange losses | (7) |  | (8) |
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other assets and (liabilities) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 11,827 | $ (2,780) | (8,359) | $ (2,952)
Total realized and unrealized gains (losses) |  |  |  |
Purchases | (2,950) | 323 | (3,847) | 289
Sales | 0 |  |  |
Settlements | 0 |  | 20 |
Balance at end of the period | 7,942 | (2,018) | 7,942 | (2,018)
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other assets and (liabilities) | Other income (loss) |  |  |  |
Total realized and unrealized gains (losses) |  |  |  |
Included in other income (loss) | (935) | $ 439 | 158 | $ 645
Total foreign exchange losses | $ 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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