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Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2018

Marketable Securities

Schedule of marketable securities

					Gross			Gross
		Amortized			Unrealized			Unrealized
September 30, 2018		Cost			Gains			Losses			Fair Value
(in thousands)
Money Market Funds		$	15,632		$	—		$	—		$	15,632
Corporate Securities			98,498			1			(471)			98,028
Government Securities			416,664			—			(1,859)			414,805
		$	530,794		$	1		$	(2,330)		$	528,465
Reported as
Cash and cash equivalents											$	15,632
Marketable securities												512,833
Total investments											$	528,465
					Gross			Gross
		Amortized			Unrealized			Unrealized
December 31, 2017		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

Schedule of maturities of marketable securities

		Amortized			Estimated
September 30, 2018		Cost			Fair Value
(in thousands)
Mature in one year or less		$	237,736		$	236,605
Mature within two years			277,426			276,228
		$	515,162		$	512,833

Schedule of unrealized losses on available-for-sale investments

The unrealized losses on available-for-sale investments and their related fair values as of September 30, 2018 and December 31, 2017 are as follows:

		Less than 12 months						12 months or greater
September 30, 2018			Fair value			Unrealized losses			Fair value			Unrealized losses
(in thousands)
Corporate Securities		$	69,494		$	(411)		$	28,534		$	(60)
Government Securities			167,111			(720)			247,694			(1,139)
		$	236,605		$	(1,131)		$	276,228		$	(1,199)
		Less than 12 months						12 months or greater
December 31, 2017			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)

X

- Definition

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

+ References

No definition available.

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- Definition

Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

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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://fasb.org/us-gaap/role/ref/legacyRef
-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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