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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Oct. 31, 2015	Mar. 31, 2013
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	$ 252,737	$ 270,921
Investment in non-marketable security
Impairment of Investment in non-marketable equity security	0	600	$ 1,400
Available-for-sale Securities, Gross Unrealized Gain (Loss)				$ 1,264
Money market funds
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	77,804	124,938
US Treasury and Government Short-term Debt Securities [Member]
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	14,110
Corporate notes, bonds and commercial paper
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	160,823	145,983
Fair Value, Measurements, Recurring [Member]
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	252,737	270,921
Fair Value, Measurements, Recurring [Member] | Money market funds
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	77,804	124,938
Fair Value, Measurements, Recurring [Member] | US Treasury and Government Short-term Debt Securities [Member]
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	14,110
Fair Value, Measurements, Recurring [Member] | Corporate notes, bonds and commercial paper
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	160,823	145,983
Fair Value, Measurements, Recurring [Member] | Level 1
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	79,068	124,938
Fair Value, Measurements, Recurring [Member] | Level 1 | Money market funds
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	77,804	124,938
Fair Value, Measurements, Recurring [Member] | Level 1 | US Treasury and Government Short-term Debt Securities [Member]
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	0
Fair Value, Measurements, Recurring [Member] | Level 1 | Corporate notes, bonds and commercial paper
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	1,264	0
Fair Value, Measurements, Recurring [Member] | Level 2
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	173,669	145,983
Fair Value, Measurements, Recurring [Member] | Level 2 | Money market funds
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 | US Treasury and Government Short-term Debt Securities [Member]
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	14,110
Fair Value, Measurements, Recurring [Member] | Level 2 | Corporate notes, bonds and commercial paper
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	159,559	145,983
Fair Value, Measurements, Recurring [Member] | Level 3
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 | Money market funds
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 | US Treasury and Government Short-term Debt Securities [Member]
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	0
Fair Value, Measurements, Recurring [Member] | Level 3 | Corporate notes, bonds and commercial paper
Financial assets subject to fair value measurements and the necessary disclosures
Total available-for-sale securities	$ 0	0
Nonrecurring basis
Investment in non-marketable security
Carrying Value		0			$ 2,000
Impairment of Investment in non-marketable equity security		600
Nonrecurring basis | Level 1
Investment in non-marketable security
Fair Value		0
Nonrecurring basis | Level 2
Investment in non-marketable security
Fair Value		0
Nonrecurring basis | Level 3
Investment in non-marketable security
Fair Value		$ 0

X

- Definition

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
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

No definition available.

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Value of the not readily marketable security or category which has been determined by management based upon fair value methods, including pricing of similar securities and valuation techniques and is included in the schedule of financial condition or the balance sheet.

+ References

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