Goodwill and Other Intangible Assets (Schedule of intangible assets subject to amortization) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	$ 111,010us-gaap_FiniteLivedIntangibleAssetsNet	$ 98,296us-gaap_FiniteLivedIntangibleAssetsNet
Intangible assets acquired during the year	0	36,980
Amortization during the year	(24,724)us-gaap_AmortizationOfIntangibleAssets	(26,250)us-gaap_AmortizationOfIntangibleAssets	(57,463)us-gaap_AmortizationOfIntangibleAssets
Currency translation during the year	(6,968)	1,984
Intangible assets subject to amortization, ending balance	79,318us-gaap_FiniteLivedIntangibleAssetsNet	111,010us-gaap_FiniteLivedIntangibleAssetsNet	98,296us-gaap_FiniteLivedIntangibleAssetsNet
Customer Relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	40,998	26,210
Intangible assets acquired during the year	0	21,792
Amortization during the year	(6,901)	(6,456)
Currency translation during the year	(180)	(548)
Intangible assets subject to amortization, ending balance	33,917	40,998
Patents [Member]
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	69,071	71,031
Intangible assets acquired during the year	0	15,188
Amortization during the year	(17,700)	(19,336)
Currency translation during the year	(6,780)	2,188
Intangible assets subject to amortization, ending balance	44,591	69,071
Other [Member]
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	941	1,055
Intangible assets acquired during the year	0	0
Amortization during the year	(123)	(458)
Currency translation during the year	(8)	344
Intangible assets subject to amortization, ending balance	$ 810	$ 941

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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

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-Name Accounting Standards Codification

-Topic 350

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