Goodwill and Other Intangible Assets (Schedule of intangible assets subject to amortization) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	$ 79,318	$ 111,010
Intangible assets acquired during the year	264,165	0
Amortization during the year	(29,909)	(24,724)	$ (26,250)
Currency translation during the year	(9,382)	(6,968)
Intangible assets subject to amortization, ending balance	304,192	79,318	111,010
Customer Relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	33,917	40,998
Intangible assets acquired during the year	258,875	0
Amortization during the year	(16,567)	(6,901)
Currency translation during the year	(5,102)	(180)
Intangible assets subject to amortization, ending balance	271,123	33,917	40,998
Patents [Member]
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	44,591	69,071
Intangible assets acquired during the year	0	0
Amortization during the year	(13,331)	(17,700)
Currency translation during the year	(4,275)	(6,780)
Intangible assets subject to amortization, ending balance	26,985	44,591	69,071
Other [Member]
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	810	941
Intangible assets acquired during the year	5,290	0
Amortization during the year	(11)	(123)
Currency translation during the year	(5)	(8)
Intangible assets subject to amortization, ending balance	$ 6,084	$ 810	$ 941