Marketable Securities - Composition of Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Cost		$ 278,290
Available-for-sale Securities, Gross Unrealized Gains, Before Tax		5
Available-for-sale Securities, Gross Unrealized Losses, Before Tax		(540)
Available-for-sale Securities, Fair Value		277,755
Short-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Cost		165,629
Available-for-sale Securities, Gross Unrealized Gains, Before Tax		5
Available-for-sale Securities, Gross Unrealized Losses, Before Tax		(211)
Available-for-sale Securities, Fair Value		165,423
Long-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Cost		112,661
Available-for-sale Securities, Gross Unrealized Losses, Before Tax		(329)
Available-for-sale Securities, Fair Value		112,332
Certificates of Deposit [Member] \| Short-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Cost		6,615
Available-for-sale Securities, Fair Value		6,615
Certificates of Deposit [Member] \| Long-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Cost		12,392
Available-for-sale Securities, Fair Value		$ 12,392
Certificates of Deposit [Member] \| Maximum [Member] \| Short-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities Contractual Maturity	1 year	1 year
Certificates of Deposit [Member] \| Maximum [Member] \| Long-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities Contractual Maturity	2 years	2 years
Certificates of Deposit [Member] \| Minimum [Member] \| Long-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities Contractual Maturity	1 year	1 year
Commercial Paper [Member] \| Short-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Cost		$ 21,991
Available-for-sale Securities, Fair Value		$ 21,991
Commercial Paper [Member] \| Maximum [Member] \| Short-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities Contractual Maturity	1 year	1 year
Corporate Notes [Member] \| Short-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Cost		$ 108,739
Available-for-sale Securities, Gross Unrealized Gains, Before Tax		5
Available-for-sale Securities, Gross Unrealized Losses, Before Tax		(173)
Available-for-sale Securities, Fair Value		108,571
Corporate Notes [Member] \| Long-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Cost		43,857
Available-for-sale Securities, Gross Unrealized Losses, Before Tax		(109)
Available-for-sale Securities, Fair Value		$ 43,748
Corporate Notes [Member] \| Maximum [Member] \| Short-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities Contractual Maturity	1 year	1 year
Corporate Notes [Member] \| Maximum [Member] \| Long-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities Contractual Maturity	2 years	2 years
Corporate Notes [Member] \| Minimum [Member] \| Long-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities Contractual Maturity	1 year	1 year
Securities of Government-sponsored Entities [Member] \| Short-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Cost		$ 28,284
Available-for-sale Securities, Gross Unrealized Losses, Before Tax		(38)
Available-for-sale Securities, Fair Value		28,246
Securities of Government-sponsored Entities [Member] \| Long-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Cost		56,412
Available-for-sale Securities, Gross Unrealized Losses, Before Tax		(220)
Available-for-sale Securities, Fair Value		$ 56,192
Securities of Government-sponsored Entities [Member] \| Maximum [Member] \| Short-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities Contractual Maturity	1 year	1 year
Securities of Government-sponsored Entities [Member] \| Maximum [Member] \| Long-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities Contractual Maturity	2 years	2 years
Securities of Government-sponsored Entities [Member] \| Minimum [Member] \| Long-term Investments [Member]
Schedule Of Available For Sale Securities [Line Items]
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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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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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+ References

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

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