Goodwill and Other Intangibles Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	$ 557,167	$ 461,685
Reclass to assets held for sale		(4,228)
Foreign currency translation adjustments and other	(10,833)	39,828
Gross Asset Value, Ending Balance	546,334	557,167	$ 461,685
Accumulated Amortization, Beginning Balance	(135,664)	(107,121)
Amortization	(27,979)	(25,079)	(19,000)
Reclass to assets held for sale		596
Foreign currency translation adjustments and other	3,452	(4,060)
Accumulated Amortization, Ending Balance	(160,191)	(135,664)	(107,121)
Net Book Value	386,143	421,503
Customer lists and relationships
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	439,312	387,893
Reclass to assets held for sale		0
Foreign currency translation adjustments and other	(10,940)	32,194
Gross Asset Value, Ending Balance	428,372	439,312	387,893
Accumulated Amortization, Beginning Balance	(74,704)	(49,165)
Amortization	(23,402)	(21,288)
Reclass to assets held for sale		0
Foreign currency translation adjustments and other	2,309	(4,251)
Accumulated Amortization, Ending Balance	(95,797)	(74,704)	(49,165)
Net Book Value	332,575	364,608
Trademarks and Trade Names
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	18,981	16,514
Reclass to assets held for sale		0
Foreign currency translation adjustments and other	(528)	1,038
Gross Asset Value, Ending Balance	18,453	18,981	16,514
Accumulated Amortization, Beginning Balance	(8,295)	(7,952)
Amortization	0	0
Reclass to assets held for sale		0
Foreign currency translation adjustments and other	119	(343)
Accumulated Amortization, Ending Balance	(8,176)	(8,295)	(7,952)
Net Book Value	10,277	10,686
Patents and technology
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	61,618	38,434
Reclass to assets held for sale		0
Foreign currency translation adjustments and other	(5,817)	2,803
Gross Asset Value, Ending Balance	55,801	61,618	38,434
Accumulated Amortization, Beginning Balance	(35,203)	(31,683)
Amortization	(1,450)	(1,412)
Reclass to assets held for sale		0
Foreign currency translation adjustments and other	1,405	(2,108)
Accumulated Amortization, Ending Balance	(35,248)	(35,203)	(31,683)
Net Book Value	20,553	26,415
Other
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	37,256	18,844
Reclass to assets held for sale		(4,228)
Foreign currency translation adjustments and other	6,452	3,793
Gross Asset Value, Ending Balance	43,708	37,256	18,844
Accumulated Amortization, Beginning Balance	(17,462)	(18,321)
Amortization	(3,127)	(2,379)
Reclass to assets held for sale		596
Foreign currency translation adjustments and other	(381)	2,642
Accumulated Amortization, Ending Balance	(20,970)	(17,462)	$ (18,321)
Net Book Value	$ 22,738	19,794
Jiangxi Jiangli New Materials Science and Technology Co. Ltd.
Finite-lived Intangible Assets [Roll Forward]
Acquisitions		59,882
Jiangxi Jiangli New Materials Science and Technology Co. Ltd. | Customer lists and relationships
Finite-lived Intangible Assets [Roll Forward]
Acquisitions		19,225
Jiangxi Jiangli New Materials Science and Technology Co. Ltd. | Trademarks and Trade Names
Finite-lived Intangible Assets [Roll Forward]
Acquisitions		1,429
Jiangxi Jiangli New Materials Science and Technology Co. Ltd. | Patents and technology
Finite-lived Intangible Assets [Roll Forward]
Acquisitions		20,381
Jiangxi Jiangli New Materials Science and Technology Co. Ltd. | Other
Finite-lived Intangible Assets [Roll Forward]
Acquisitions		$ 18,847