Goodwill and Other Intangible Assets (Net intangible assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Intangible Assets, Net:
Cost	$ 626,713	$ 672,949
Acquisitions	264,165	0
Currency translation	(52,114)	(6,968)
Accumulated amortization	534,572	586,663
Net Value	304,192	79,318	$ 111,010
Customer Relationships [Member]
Intangible Assets, Net:
Cost	354,768	373,117
Acquisitions	258,875	0
Currency translation	(24,927)	(180)
Accumulated amortization	317,593	339,020
Net Value	271,123	33,917	40,998
Patents [Member]
Intangible Assets, Net:
Cost	270,466	297,999
Acquisitions	0	0
Currency translation	(27,208)	(6,780)
Accumulated amortization	216,273	246,628
Net Value	26,985	44,591	$ 69,071
Other [Member]
Intangible Assets, Net:
Cost	1,479	1,833
Acquisitions	5,290	0
Currency translation	21	(8)
Accumulated amortization	706	1,015
Net Value	$ 6,084	$ 810