Goodwill and Other Intangible Assets (Schedule of intangible assets subject to amortization) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 5,181
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	154,668	220,237
Amortization during the year	(57,463)	(70,364)	(69,513)
Currency translation during the year	1,091	(386)
Intangible assets subject to amortization, ending balance	98,296	154,668	220,237
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		5,181
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	64,958	106,432
Amortization during the year	(38,595)	(47,460)
Currency translation during the year	(153)	805
Intangible assets subject to amortization, ending balance	26,210	64,958
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		0
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	88,544	112,520
Amortization during the year	(18,747)	(22,782)
Currency translation during the year	1,234	(1,194)
Intangible assets subject to amortization, ending balance	71,031	88,544
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		0
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	1,166	1,285
Amortization during the year	(121)	(122)
Currency translation during the year	10	3
Intangible assets subject to amortization, ending balance	$ 1,055	$ 1,166