Goodwill and Other Intangible Assets (Schedule of intangible assets subject to amortization) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	$ 98,296	$ 154,668
Intangible assets acquired during the year	36,980
Amortization during the year	(26,250)	(57,463)	(70,364)
Currency translation during the year	1,984	1,091
Intangible assets subject to amortization, ending balance	111,010	98,296	154,668
Customer Relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	26,210	64,958
Intangible assets acquired during the year	21,792
Amortization during the year	(6,456)	(38,595)
Currency translation during the year	(548)	(153)
Intangible assets subject to amortization, ending balance	40,998	26,210
Patents [Member]
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	71,031	88,544
Intangible assets acquired during the year	15,188
Amortization during the year	(19,336)	(18,747)
Currency translation during the year	2,188	1,234
Intangible assets subject to amortization, ending balance	69,071	71,031
Other [Member]
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	1,055	1,166
Intangible assets acquired during the year	0
Amortization during the year	(458)	(121)
Currency translation during the year	344	10
Intangible assets subject to amortization, ending balance	$ 941	$ 1,055