Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets (Net intangible assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Intangible Assets, Net:
Cost	$ 672,949	$ 633,985
Acquisitions	0	36,980
Currency translation	(6,968)	1,984
Accumulated amortization	586,663	561,939
Net Value	79,318us-gaap_FiniteLivedIntangibleAssetsNet	111,010us-gaap_FiniteLivedIntangibleAssetsNet	98,296us-gaap_FiniteLivedIntangibleAssetsNet
Customer Relationships [Member]
Intangible Assets, Net:
Cost	373,117	351,873
Acquisitions	0	21,792
Currency translation	(180)	(548)
Accumulated amortization	339,020	332,119
Net Value	33,917	40,998	26,210
Patents [Member]
Intangible Assets, Net:
Cost	297,999	280,623
Acquisitions	0	15,188
Currency translation	(6,780)	2,188
Accumulated amortization	246,628	228,928
Net Value	44,591	69,071	71,031
Other Intangible Assets [Member]
Intangible Assets, Net:
Cost	1,833	1,489
Acquisitions	0	0
Currency translation	(8)	344
Accumulated amortization	1,015	892
Net Value	$ 810	$ 941

Finite-Lived Intangible Assets, Accumulated Assets Acquired

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- Definition

Finite-Lived Intangible Assets, Accumulated Translation Adjustments

+ References

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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