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Fair Value Measurement of Assets and Liabilities (Fair Value of Money Market Funds, Short and Long-Term Investments Classified as Available for Sale Securities) (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Cost		$ 321,909	$ 125,843
Gross Unrealized Losses		(6)	(297)	[1]
Estimated Fair Value		321,903	125,546
Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		272,258	85,337
Estimated Fair Value		272,258	85,337
Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		272,258	85,337
Estimated Fair Value		272,258	85,337
Restricted Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		49,151
Estimated Fair Value		49,151
Restricted Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		49,151
Estimated Fair Value		49,151
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		61	6,631
Gross Unrealized Losses	[1]		(19)
Estimated Fair Value		61	6,612
Short-term Investments [Member] | Sovereign Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		12	2,235
Gross Unrealized Losses	[1]		(10)
Estimated Fair Value		12	2,225
Short-term Investments [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		49	4,396
Gross Unrealized Losses	[1]		(9)
Estimated Fair Value		49	4,387
Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		439	33,875
Gross Unrealized Losses		(6)	(278)	[1]
Estimated Fair Value		433	33,597
Long-term Investments [Member] | Sovereign Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		190	13,821
Gross Unrealized Losses		(2)	(150)	[1]
Estimated Fair Value		188	13,671
Long-term Investments [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		249	20,054
Gross Unrealized Losses		(4)	(128)	[1]
Estimated Fair Value		$ 245	$ 19,926
[1] Unrealized gains (losses) from securities are attributable to market price movements, net foreign exchange losses and foreign currency translation. Management does not believe any remaining significant unrealized losses represent other-than-temporary impairments based on the evaluation of available evidence including the credit rating of the investments, as of September 30, 2018 and December 31, 2017.

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-Subparagraph (b)-(g)
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