Short-term Investments (Available-For-Sale Securities Reported At Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Level 1 Securities [Member] \| Money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and Money market funds, Amortized Cost	$ 107,199	$ 111,759
Cash and Money market funds, Fair Value Disclosure	107,199	111,759
Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and Money market funds, Amortized Cost	1,708,220	1,007,543
Cash and Money market funds, Fair Value Disclosure	1,708,220	1,007,543
Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	154	557
Available-for-sale Securities, Gross Unrealized Losses	(1,464)	(295)
Total, Amortized Cost	2,318,114	1,613,928
Total, Estimated Fair Value	2,316,804	1,614,190
Fair Value, Measurements, Recurring [Member] \| Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Estimated Fair Value	1,809,330	1,113,608
Fair Value, Measurements, Recurring [Member] \| Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Estimated Fair Value	501,385	494,888
Fair Value, Measurements, Recurring [Member] \| Non-current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Estimated Fair Value	6,089	5,694
Fair Value, Measurements, Recurring [Member] \| Level 1 Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and Money market funds, Non-current assets	4,461	5,694
Fair Value, Measurements, Recurring [Member] \| Level 1 Securities [Member] \| Money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash, Cash Equivalents and Restricted Cash, Gross Unrealized Gains	0	0
Cash, Cash Equivalents and Restricted Cash, Gross Unrealized Losses	0	0
Cash and Money market funds, Fair Value Disclosure	102,738	106,065
Fair Value, Measurements, Recurring [Member] \| Level 2 Securities [Member] \| Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	240,867	295,500
Available-for-sale Securities, Gross Unrealized Gains	154	432
Available-for-sale Securities, Gross Unrealized Losses	(409)	(199)
Available-for-sale Securities, Estimated Fair Value	240,612	295,733
Fair Value, Measurements, Recurring [Member] \| Level 2 Securities [Member] \| Government securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	235,252	168,749
Available-for-sale Securities, Gross Unrealized Gains	0	120
Available-for-sale Securities, Gross Unrealized Losses	(1,046)	(95)
Available-for-sale Securities, Estimated Fair Value	234,206	168,774
Fair Value, Measurements, Recurring [Member] \| Level 2 Securities [Member] \| Asset and mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost		112
Available-for-sale Securities, Gross Unrealized Gains		0
Available-for-sale Securities, Gross Unrealized Losses		0
Available-for-sale Securities, Estimated Fair Value		112
Fair Value, Measurements, Recurring [Member] \| Level 2 Securities [Member] \| Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost		3,600
Available-for-sale Securities, Gross Unrealized Gains		0
Available-for-sale Securities, Gross Unrealized Losses		0
Available-for-sale Securities, Estimated Fair Value		3,600
Fair Value, Measurements, Recurring [Member] \| Level 2 Securities [Member] \| Agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	26,576	26,665
Available-for-sale Securities, Gross Unrealized Gains	0	5
Available-for-sale Securities, Gross Unrealized Losses	(9)	(1)
Available-for-sale Securities, Estimated Fair Value	26,567	26,669
Fair Value, Measurements, Recurring [Member] \| Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash, Cash Equivalents and Restricted Cash, Gross Unrealized Gains	0	0
Cash, Cash Equivalents and Restricted Cash, Gross Unrealized Losses	0	0
Cash and Money market funds, Fair Value Disclosure	1,706,592	$ 1,007,543
Cash and Money market funds, Non-current assets	$ 1,628

Available-for-sale Securities including Cash, Cash Equivalents and Restricted Cash, Amortized Cost

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Available-for-sale Securities including Cash, Cash Equivalents and Restricted Cash, Fair Value Disclosure

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Cash, Cash Equivalents And Restricted Cash, Noncurrent Assets

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 320
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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