Short-term Investments - Available-For-Sale Securities Reported At Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Total, Amortized Cost	$ 2,801,015	$ 1,613,928
Total, Unrealized Gains	814	557
Total, Unrealized Losses	(137)	(295)
Total, Estimated Fair Value	2,801,692	1,614,190
Level 1 Securities [Member] \| Money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash, Money market and Government and agency securities classified as cash equivalents, Amortized Cost	105,603	111,759
Cash, Money market and Government and agency securities classified as cash equivalents, Gross Unrealized Gains	0	0
Cash, Money market and Government and agency securities classified as cash equivalents, Gross Unrealized Losses	0	0
Cash, Money market and Government and agency securities classified as cash equivalents, Estimated Fair Value	105,603	111,759
Level 2 Securities [Member] \| Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	271,569	295,500
Available-for-sale Securities, Gross Unrealized Gains	419	432
Available-for-sale Securities, Gross Unrealized Losses	(130)	(199)
Available-for-sale Securities, Estimated Fair Value	271,858	295,733
Level 2 Securities [Member] \| Government securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	197,919	168,749
Available-for-sale Securities, Gross Unrealized Gains	364	120
Available-for-sale Securities, Gross Unrealized Losses	(7)	(95)
Available-for-sale Securities, Estimated Fair Value	198,276	168,774
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
Level 2 Securities [Member] \| Certificates of deposits and commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	6,100
Available-for-sale Securities, Gross Unrealized Gains	0
Available-for-sale Securities, Gross Unrealized Losses	0
Available-for-sale Securities, Estimated Fair Value	6,100
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
Level 2 Securities [Member] \| Agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	26,621	26,665
Available-for-sale Securities, Gross Unrealized Gains	31	5
Available-for-sale Securities, Gross Unrealized Losses	0	(1)
Available-for-sale Securities, Estimated Fair Value	26,652	26,669
Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash, Money market and Government and agency securities classified as cash equivalents, Amortized Cost	2,193,203	1,007,543
Cash, Money market and Government and agency securities classified as cash equivalents, Gross Unrealized Gains	0	0
Cash, Money market and Government and agency securities classified as cash equivalents, Gross Unrealized Losses	0	0
Cash, Money market and Government and agency securities classified as cash equivalents, Estimated Fair Value	$ 2,193,203	$ 1,007,543

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

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