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Fair value of financial instruments and marketable securities (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Marketable securities accounted for as available-for-sale securities
Amortized Cost	$ 281,492	$ 265,880
Gross Unrealized Gains	83	87
Gross Unrealized Losses	(672)	(474)
Marketable securities	280,903	265,493
Transfers of assets between Level 1 and Level 2 of the fair value measurement hierarchy	0
Commercial paper
Marketable securities accounted for as available-for-sale securities
Amortized Cost	26,877
Gross Unrealized Gains	80
Marketable securities	26,957
Corporate debt securities
Marketable securities accounted for as available-for-sale securities
Amortized Cost	226,959	230,379
Gross Unrealized Gains		80
Gross Unrealized Losses	(640)	(428)
Marketable securities	226,319	230,031
Government obligations
Marketable securities accounted for as available-for-sale securities
Amortized Cost	27,656	35,501
Gross Unrealized Gains	3	7
Gross Unrealized Losses	(32)	(46)
Marketable securities	$ 27,627	$ 35,462

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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
-Paragraph 1
-Subparagraph (b)
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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