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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

Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Amounts Acquired

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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