Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets (Net intangible assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Intangible Assets, Net:
Cost	$ 633,985	$ 624,103
Acquisitions	36,980
Currency translation	1,984	9,882
Accumulated amortization	561,939	535,689
Net Value	111,010	98,296	154,668
Customer Relationships [Member]
Intangible Assets, Net:
Cost	351,873	347,447
Acquisitions	21,792
Currency translation	(548)	4,426
Accumulated amortization	332,119	325,663
Net Value	40,998	26,210	64,958
Patents [Member]
Intangible Assets, Net:
Cost	280,623	275,178
Acquisitions	15,188
Currency translation	2,188	5,445
Accumulated amortization	228,928	209,592
Net Value	69,071	71,031	88,544
Other Intangible Assets [Member]
Intangible Assets, Net:
Cost	1,489	1,478
Acquisitions	0
Currency translation	344	11
Accumulated amortization	892	434
Net Value	$ 941	$ 1,055