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Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2017

Marketable Securities

Schedule of marketable securities

		December 31, 2017
					Gross			Gross
		Amortized			Unrealized			Unrealized
		Cost			Gains			Losses			Fair Value
(in thousands)
Money Market Funds		$	5,175		$	—		$	—		$	5,175
Corporate Securities			123,860			—			(590)			123,270
Government Securities			224,739			—			(1,209)			223,530
		$	353,774		$	—		$	(1,799)		$	351,975
Reported as
Cash and cash equivalents											$	5,175
Marketable securities												346,800
Total investments											$	351,975
		December 31, 2016
					Gross			Gross
		Amortized			Unrealized			Unrealized
		Cost			Gains			Losses			Fair Value
(in thousands)
Money Market Funds		$	12,137		$	—		$	—		$	12,137
Corporate Securities			182,394			6			(917)			181,483
Government Securities			207,986			44			(565)			207,465
		$	402,517		$	50		$	(1,482)		$	401,085
Reported as
Cash and cash equivalents											$	12,137
Marketable securities												388,948
Total investments											$	401,085

Schedule of maturities of marketable securities

		Amortized			Estimated
		Cost			Fair Value
(in thousands)
Mature in one year or less		$	208,200		$	207,603
Mature after one year through five years			140,399			139,197
		$	348,599		$	346,800

Schedule of unrealized losses on available-for-sale investments

		December 31, 2017
		Less than 12 months						12 months or greater
			Fair value			Unrealized losses			Fair value			Unrealized losses
(in thousands)
Corporate Securities		$	79,290		$	(137)		$	43,980		$	(453)
Government Securities			128,313			(461)			95,217			(748)
		$	207,603		$	(598)		$	139,197		$	(1,201)
		December 31, 2016
		Less than 12 months						12 months or greater
			Fair value			Unrealized losses			Fair value			Unrealized losses
(in thousands)
Corporate Securities		$	82,215		$	(133)		$	88,990		$	(784)
Government Securities			17,573			(16)			149,694			(549)
		$	99,788		$	(149)		$	238,684		$	(1,333)

X

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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- Definition

Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.

+ References

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- Definition

For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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