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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
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Total realized and unrealized gains |  |
Amounts acquired | $ 19,970 |
Other assets and (liabilities) |  |
Total realized and unrealized gains |  |
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 | 46,186 |
Total realized and unrealized gains |  |
Purchases | 9,365 |
Settlements | 20 |
Balance at end of the period | 75,522 |
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other income (loss) |  |
Total realized and unrealized gains |  |
Included in other income (loss) | (18) |
Total foreign exchange losses | (1) |
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 | 54,545 |
Total realized and unrealized gains |  |
Purchases | 10,262 |
Settlements | 0 |
Amounts acquired | 0 |
Balance at end of the period | 63,695 |
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other investments | Other income (loss) |  |
Total realized and unrealized gains |  |
Included in other income (loss) | (1,111) |
Total foreign exchange losses | (1) |
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 | (8,359) | $ (2,952)
Total realized and unrealized gains |  |
Purchases | (897) | (34)
Settlements | 20 |
Balance at end of the period | 11,827 | (2,780)
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other assets and (liabilities) | Other income (loss) |  |
Total realized and unrealized gains |  |
Included in other income (loss) | 1,093 | $ 206
Total foreign exchange losses | $ 0 |

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- Definition This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets); the fair value of which assets and liabilities was or is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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