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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Total realized and unrealized gains (losses) |  |  |  |
Amounts acquired |  |  | $ 19,970 |
Other assets and (liabilities) |  |  |  |
Total realized and unrealized gains (losses) |  |  |  |
Settlements |  | $ (983) |  |
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 | $ 82,752 |  | 46,186 |
Total realized and unrealized gains (losses) |  |  |  |
Purchases | (535) |  | 13,509 |
Settlements |  |  | 20 |
Balance at end of the period | 80,429 |  | 80,429 |
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other income (loss) |  |  |  |
Total realized and unrealized gains (losses) |  |  |  |
Included in other income | (1,780) |  | 760 |
Total foreign exchange losses | (8) |  | (16) |
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 | 74,810 |  | 54,545 |
Total realized and unrealized gains (losses) |  |  |  |
Purchases | 0 |  | 17,891 |
Settlements |  |  | 0 |
Amounts acquired |  |  | 0 |
Balance at end of the period | 74,210 |  | 74,210 |
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other investments | Other income (loss) |  |  |  |
Total realized and unrealized gains (losses) |  |  |  |
Included in other income | (592) |  | 1,790 |
Total foreign exchange losses | (8) |  | (16) |
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 | 7,942 | (2,018) | (8,359) | $ (2,952)
Total realized and unrealized gains (losses) |  |  |  |
Purchases | (535) | (9,668) | (4,382) | (9,379)
Settlements |  |  | 20 | 983
Balance at end of the period | 6,219 | (8,949) | 6,219 | (8,949)
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 | (1,188) | $ 1,754 | (1,030) | $ 2,399
Total foreign exchange losses | $ 0 |  | $ 0 |

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