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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		Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cost		$ 382,452	$ 376,306
Gross Unrealized Gains		880	76
Gross Unrealized Losses	[1]	(195)	(1,099)
Estimated Fair Value		383,137	375,283
Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		56,537	62,219
Gross Unrealized Losses	[1]	(4)	(11)
Estimated Fair Value		56,533	62,208
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		138,744	125,627
Gross Unrealized Gains		47	5
Gross Unrealized Losses	[1]	(76)	(178)
Estimated Fair Value		138,715	125,454
Long-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		187,171	188,460
Gross Unrealized Gains		833	71
Gross Unrealized Losses	[1]	(115)	(910)
Estimated Fair Value		187,889	187,621
Money Market Funds [Member] | Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		47,669	46,423
Estimated Fair Value		47,669	46,423
Sovereign Debt Securities [Member] | Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		8,973	13,981
Gross Unrealized Gains		3
Gross Unrealized Losses	[1]		(19)
Estimated Fair Value		8,976	13,962
Sovereign Debt Securities [Member] | Long-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		56,783	55,536
Gross Unrealized Gains		222	53
Gross Unrealized Losses	[1]		(249)
Estimated Fair Value		57,005	55,340
Corporate Debt Securities [Member] | Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		8,868	15,796
Gross Unrealized Losses	[1]	(4)	(11)
Estimated Fair Value		8,864	15,785
Corporate Debt Securities [Member] | Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		118,250	103,130
Gross Unrealized Gains		41	4
Gross Unrealized Losses	[1]	(73)	(157)
Estimated Fair Value		118,218	102,977
Corporate Debt Securities [Member] | Long-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		129,386	129,921
Gross Unrealized Gains		610	18
Gross Unrealized Losses	[1]	(115)	(659)
Estimated Fair Value		129,881	129,280
Certificates of Deposit [Member] | Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		11,521	8,516
Gross Unrealized Gains		3	1
Gross Unrealized Losses	[1]	(3)	(2)
Estimated Fair Value		11,521	8,515
Certificates of Deposit [Member] | Long-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		1,002	3,003
Gross Unrealized Gains		1
Gross Unrealized Losses	[1]		(2)
Estimated Fair Value		$ 1,003	$ 3,001
[1] Unrealized losses from securities are primarily attributable to market price movements. 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 March 31, 2016 and December 31, 2015.

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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