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Cash and Investments (Available for Sale by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Mature within One Year	$ 343,811
After One Year through Two Years	24,414
Fair Value	368,225	$ 459,966
Money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Mature within One Year	48,253
After One Year through Two Years	0
Fair Value	48,253	71,457
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Mature within One Year	281,572
After One Year through Two Years	22,214
Fair Value	303,786	165,375
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Mature within One Year	0
After One Year through Two Years	550
Fair Value	550	152,407
U.S. Treasury and government sponsored enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Mature within One Year	13,986
After One Year through Two Years	1,650
Fair Value	$ 15,636	$ 70,727

X

- Definition

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
-Section 25
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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

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