Short-term Investments - Available-For-Sale Securities Reported At Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Level 2 securities, Gross Unrealized Gains	$ 1,962	$ 154
Level 2 securities, Gross Unrealized Losses	(49)	(1,464)
Total, amortized cost	1,836,403	2,318,114
Total, estimated fair value	1,838,316	2,316,804
Level 1 Securities \| Money market funds
Schedule of Available-for-sale Securities [Line Items]
Cash and money market funds, Amortized Cost	543,564	107,199
Cash and money market funds, Estimated Fair Value	543,564	107,199
Level 2 Securities \| Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Level 2 securities, Amortized Cost	200,366	240,867
Level 2 securities, Gross Unrealized Gains	1,195	154
Level 2 securities, Gross Unrealized Losses	(49)	(409)
Level 2 securities, Estimated Fair Value	201,512	240,612
Level 2 Securities \| Government securities
Schedule of Available-for-sale Securities [Line Items]
Level 2 securities, Amortized Cost	230,815	235,252
Level 2 securities, Gross Unrealized Gains	759	0
Level 2 securities, Gross Unrealized Losses	0	(1,046)
Level 2 securities, Estimated Fair Value	231,574	234,206
Level 2 Securities \| Agency Securities
Schedule of Available-for-sale Securities [Line Items]
Level 2 securities, Amortized Cost	10,209	26,576
Level 2 securities, Gross Unrealized Gains	8	0
Level 2 securities, Gross Unrealized Losses	0	(9)
Level 2 securities, Estimated Fair Value	10,217	26,567
Cash
Schedule of Available-for-sale Securities [Line Items]
Cash and money market funds, Amortized Cost	851,449	1,708,220
Cash and money market funds, Estimated Fair Value	851,449	1,708,220
Fair Value, Measurements, Recurring \| Level 1 Securities
Schedule of Available-for-sale Securities [Line Items]
Cash, Cash Equivalents and Restricted Cash, Noncurrent Assets	1,514	4,461
Fair Value, Measurements, Recurring \| Level 1 Securities \| Money market funds
Schedule of Available-for-sale Securities [Line Items]
Cash and money market funds, Estimated Fair Value	542,050	102,738
Fair Value, Measurements, Recurring \| Level 2 Securities \| Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Level 2 securities, Estimated Fair Value	201,512	240,612
Fair Value, Measurements, Recurring \| Level 2 Securities \| Government securities
Schedule of Available-for-sale Securities [Line Items]
Level 2 securities, Estimated Fair Value	231,574	234,206
Fair Value, Measurements, Recurring \| Level 2 Securities \| Agency Securities
Schedule of Available-for-sale Securities [Line Items]
Level 2 securities, Estimated Fair Value	10,217	26,567
Fair Value, Measurements, Recurring \| Cash
Schedule of Available-for-sale Securities [Line Items]
Cash and money market funds, Estimated Fair Value	848,875	1,706,592
Cash, Cash Equivalents and Restricted Cash, Noncurrent Assets	2,574	1,628
Cash and Cash Equivalents \| Fair Value, Measurements, Recurring
Schedule of Available-for-sale Securities [Line Items]
Total, estimated fair value	1,390,925	1,809,330
Non-current Assets \| Fair Value, Measurements, Recurring
Schedule of Available-for-sale Securities [Line Items]
Total, estimated fair value	4,088	6,089
Short-term Investments \| Fair Value, Measurements, Recurring
Schedule of Available-for-sale Securities [Line Items]
Total, estimated fair value	$ 443,303	$ 501,385

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

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

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-Publisher FASB
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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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