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Other intangible assets, net (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets subject to amortization | Customer related intangibles
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	$ 1,031,208	$ 1,022,134
Accumulated amortization	(320,605)	(302,156)
Net book value	710,603	719,978
Assets subject to amortization | Unpatented technology
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	198,735	193,915
Accumulated amortization	(78,048)	(72,358)
Net book value	120,687	121,557
Assets subject to amortization | Software
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	49,396	49,395
Accumulated amortization	(37,190)	(35,833)
Net book value	12,206	13,562
Assets subject to amortization | Patents and other protective rights
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	27,575	25,398
Accumulated amortization	(18,405)	(17,699)
Net book value	9,170	7,699
Assets subject to amortization | Trade secrets
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	1,500	1,500
Accumulated amortization	(1,396)	(1,361)
Net book value	104	139
Assets not subject to amortization | Trade names
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	232,226	231,207
Accumulated amortization	0	0
Net book value	$ 232,226	$ 231,207

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- Definition

The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

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- Definition

Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

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- Definition

The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

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