Goodwill and Other Intangibles Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	$ 461,685	$ 473,571
Reclass from assets held for sale		1,454
Foreign currency translation adjustments and other	39,828	(13,340)
Acquisitions	59,882
Reclass to assets held for sale	(4,228)
Gross Asset Value, Ending Balance	557,167	461,685	$ 473,571
Accumulated Amortization, Beginning Balance	(107,121)	(89,703)
Amortization	(25,079)	(19,039)	(16,900)
Reclass from assets held for sale		(1,322)
Foreign currency translation adjustments and other	(4,060)	2,943
Reclass to assets held for sale	596
Accumulated Amortization, Ending Balance	(135,664)	(107,121)	(89,703)
Net Book Value	421,503	354,564
Customer lists and relationships
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	387,893	398,725
Reclass from assets held for sale		0
Foreign currency translation adjustments and other	32,194	(10,832)
Acquisitions	19,225
Reclass to assets held for sale	0
Gross Asset Value, Ending Balance	439,312	387,893	398,725
Accumulated Amortization, Beginning Balance	(49,165)	(32,656)
Amortization	(21,288)	(18,034)
Reclass from assets held for sale		0
Foreign currency translation adjustments and other	(4,251)	1,525
Reclass to assets held for sale	0
Accumulated Amortization, Ending Balance	(74,704)	(49,165)	(32,656)
Net Book Value	364,608	338,728
Trademarks and Trade Names
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	16,514	16,923
Reclass from assets held for sale		0
Foreign currency translation adjustments and other	1,038	(409)
Acquisitions	1,429
Reclass to assets held for sale	0
Gross Asset Value, Ending Balance	18,981	16,514	16,923
Accumulated Amortization, Beginning Balance	(7,952)	(8,086)
Amortization	0	0
Reclass from assets held for sale		0
Foreign currency translation adjustments and other	(343)	134
Reclass to assets held for sale	0
Accumulated Amortization, Ending Balance	(8,295)	(7,952)	(8,086)
Net Book Value	10,686	8,562
Patents and technology
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	38,434	40,144
Reclass from assets held for sale		0
Foreign currency translation adjustments and other	2,803	(1,710)
Acquisitions	20,381
Reclass to assets held for sale	0
Gross Asset Value, Ending Balance	61,618	38,434	40,144
Accumulated Amortization, Beginning Balance	(31,683)	(32,008)
Amortization	(1,412)	(574)
Reclass from assets held for sale		0
Foreign currency translation adjustments and other	(2,108)	899
Reclass to assets held for sale	0
Accumulated Amortization, Ending Balance	(35,203)	(31,683)	(32,008)
Net Book Value	26,415	6,751
Other
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	18,844	17,779
Reclass from assets held for sale		1,454
Foreign currency translation adjustments and other	3,793	(389)
Acquisitions	18,847
Reclass to assets held for sale	(4,228)
Gross Asset Value, Ending Balance	37,256	18,844	17,779
Accumulated Amortization, Beginning Balance	(18,321)	(16,953)
Amortization	(2,379)	(431)
Reclass from assets held for sale		(1,322)
Foreign currency translation adjustments and other	2,642	385
Reclass to assets held for sale	596
Accumulated Amortization, Ending Balance	(17,462)	(18,321)	$ (16,953)
Net Book Value	$ 19,794	$ 523