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Marketable Securities - Unrealized losses (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair value
Fair value, less than 12 months	$ 236,605	$ 207,603
Fair value, 12 months or greater	276,228	139,197
Unrealized losses
Unrealized losses, Less than 12 months	(1,131)	(598)
Unrealized losses, 12 months or greater	(1,199)	(1,201)
Corporate Securities
Fair value
Fair value, less than 12 months	69,494	79,290
Fair value, 12 months or greater	28,534	43,980
Unrealized losses
Unrealized losses, Less than 12 months	(411)	(137)
Unrealized losses, 12 months or greater	(60)	(453)
Government Securities
Fair value
Fair value, less than 12 months	167,111	128,313
Fair value, 12 months or greater	247,694	95,217
Unrealized losses
Unrealized losses, Less than 12 months	(720)	(461)
Unrealized losses, 12 months or greater	$ (1,139)	$ (748)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

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