Goodwill and Other Intangible Assets (Schedule of intangible assets subject to amortization) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	$ 304,192	$ 79,318
Intangible assets acquired during the year	0	264,165
Amortization during the year	(39,545)	(29,909)	$ (24,724)
Currency translation during the year	(10,188)	(9,382)
Intangible assets subject to amortization, ending balance	254,459	304,192	79,318
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	271,123	33,917
Intangible assets acquired during the year	0	258,875
Amortization during the year	(25,778)	(16,567)
Currency translation during the year	(9,641)	(5,102)
Intangible assets subject to amortization, ending balance	235,704	271,123	33,917
Patents
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	26,985	44,591
Intangible assets acquired during the year	0	0
Amortization during the year	(13,141)	(13,331)
Currency translation during the year	(420)	(4,275)
Intangible assets subject to amortization, ending balance	13,424	26,985	44,591
Other
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, beginning balance	6,084	810
Intangible assets acquired during the year	0	5,290
Amortization during the year	(626)	(11)
Currency translation during the year	(127)	(5)
Intangible assets subject to amortization, ending balance	$ 5,331	$ 6,084	$ 810