Financial instruments and fair value measurement Available-for-Sale Investments - Contractual Maturity (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Available-for-Sale Investments - Contractual Maturity [Abstract]
Available-for-sale Securities, Contractual Maturities, Less than one year, Amortized Cost	$ 19,245
Available-for-sale Securities, Contractual Maturities, Less than one year, Fair Value	19,239
Available-for-sale Securities, Contractual Maturities, One to three years, Amortized Cost	179,575
Available-for-sale securities, Contractual Maturities, One to three years, Fair Value	179,434
Available-for-sale securities, Contractual Maturities, Above three years, Amortized Cost	13,846
Available-for-sale securities, Contractual Maturities, Above three years, Fair Value	$ 13,823

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Available-for-sale securities, Debt Maturities, Above Three Years, Amortized Cost Basis

+ References

No definition available.

+ Details

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- Definition

Available-for-sale securities, Debt Maturities, Above Three Years, Fair Value

+ References

No definition available.

+ Details

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- Definition

Available-for-sale Securities, Debt Maturities, One to Three Years, Amortized Cost Basis

+ References

No definition available.

+ Details

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- Definition

Available-for-sale securities, Debt Maturities, One to Three Years, Fair Value

+ References

No definition available.

+ Details

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- Definition

Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563

+ Details

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- Definition

Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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