Financial instruments and fair value measurement Available-for-Sale Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Fixed income mutual funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 222,088
Gross Unrealized Gains	301
Gross Unrealized Losses	0
Fair Value	222,389
Government bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	63,594
Gross Unrealized Gains	5
Gross Unrealized Losses	6
Fair Value	63,593
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	138,319
Gross Unrealized Gains	0
Gross Unrealized Losses	154
Fair Value	138,165
Asset backed and mortgage backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,753
Gross Unrealized Gains	2
Gross Unrealized Losses	17
Fair Value	$ 10,738

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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