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Cash and Investments (Summary by Security Type) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Amortized Cost	$ 368,344	$ 460,274
Gross Unrealized Gains	41	14
Gross Unrealized Losses	(160)	(322)
Fair Value	368,225	459,966
Money market funds [Member]
Investment [Line Items]
Amortized Cost	48,253	71,457
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	48,253	71,457
Commercial paper [Member]
Investment [Line Items]
Amortized Cost	303,877	165,375
Gross Unrealized Gains	41	0
Gross Unrealized Losses	(132)	0
Fair Value	303,786	165,375
Corporate bonds [Member]
Investment [Line Items]
Amortized Cost	550	152,712
Gross Unrealized Gains	0	3
Gross Unrealized Losses	0	(308)
Fair Value	550	152,407
U.S. Treasury and government sponsored enterprises [Member]
Investment [Line Items]
Amortized Cost	15,664	70,730
Gross Unrealized Gains	0	11
Gross Unrealized Losses	(28)	(14)
Fair Value	$ 15,636	$ 70,727

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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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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