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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

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

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Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3).

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-Publisher FASB
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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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