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Fair value of financial instruments and marketable securities (Details 2) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Marketable securities accounted for as available-for-sale securities
Amortized Cost	$ 226,485	$ 265,880
Gross Unrealized Gains	42	87
Gross Unrealized Losses	(528)	(474)
Fair Value	225,999	265,493
Commercial paper
Marketable securities accounted for as available-for-sale securities
Amortized Cost	19,093
Gross Unrealized Gains	7
Fair Value	19,100
Corporate debt securities
Marketable securities accounted for as available-for-sale securities
Amortized Cost	171,867	230,379
Gross Unrealized Gains	17	80
Gross Unrealized Losses	(492)	(428)
Fair Value	171,392	230,031
Government obligations
Marketable securities accounted for as available-for-sale securities
Amortized Cost	35,525	35,501
Gross Unrealized Gains	18	7
Gross Unrealized Losses	(36)	(46)
Fair Value	$ 35,507	$ 35,462

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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