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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | $ 73,843 | $ 75,522 | $ 79,365 | $ 46,186
Total realized and unrealized losses |  |  |  |
Total foreign exchange losses |  | (7) | (21) | (8)
Purchases | (482) | 4,679 | 19,869 | 14,044
Sales | (790) |  | (9,589) |
Settlements | (5,739) |  | (5,739) | 20
Amounts acquired |  |  |  | 19,970
Balance at end of the period | 64,739 | 82,752 | 64,739 | 82,752
Other income (loss) |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other (loss) income | (1,713) | (935) | (4,610) | 158
Net realized and unrealized gains on investments |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other (loss) income | (380) | 3,493 | (14,536) | 2,382
Other investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 72,620 | 63,695 | 74,634 | 54,545
Total realized and unrealized losses |  |  |  |
Total foreign exchange losses |  | (7) | (21) | (8)
Purchases | 0 | 7,629 | 20,962 | 17,891
Sales | (790) |  | (9,589) |
Settlements | 0 |  | 0 | 0
Amounts acquired |  |  |  | 0
Balance at end of the period | 71,450 | 74,810 | 71,450 | 74,810
Other investments | Other income (loss) |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other (loss) income | 0 | 0 | 0 | 0
Other investments | Net realized and unrealized gains on investments |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other (loss) income | (380) | 3,493 | (14,536) | 2,382
Other assets and (liabilities) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 1,223 | 11,827 | 4,731 | (8,359)
Total realized and unrealized losses |  |  |  |
Total foreign exchange losses |  | 0 | 0 | 0
Purchases | (482) | (2,950) | (1,093) | (3,847)
Sales | 0 |  | 0 |
Settlements | (5,739) |  | (5,739) | 20
Amounts acquired |  |  |  | 19,970
Balance at end of the period | (6,711) | 7,942 | (6,711) | 7,942
Other assets and (liabilities) | Other income (loss) |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other (loss) income | (1,713) | (935) | (4,610) | 158
Other assets and (liabilities) | Net realized and unrealized gains on investments |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other (loss) income | $ 0 | $ 0 | $ 0 | $ 0

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