Goodwill and Other Intangibles - Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Asset Value, Beginning of Period	$ 557,167
Foreign currency translation adjustments and other	18,908
Gross Asset Value, End of Period	576,075
Accumulated Amortization, Beginning of Period	(135,664)
Amortization	(7,418)
Foreign currency translation adjustments and other	(3,379)
Accumulated Amortization, End of Period	(146,461)
Net Book Value	429,614	$ 421,503
Other intangibles classified as assets held for sale	3,800	3,600
Customer lists and relationships
Finite-Lived Intangible Assets [Line Items]
Gross Asset Value, Beginning of Period	439,312
Foreign currency translation adjustments and other	13,054
Gross Asset Value, End of Period	452,366
Accumulated Amortization, Beginning of Period	(74,704)
Amortization	(5,962)
Foreign currency translation adjustments and other	(2,005)
Accumulated Amortization, End of Period	(82,671)
Net Book Value	369,695	364,608
Trade names and trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Asset Value, Beginning of Period	18,981
Foreign currency translation adjustments and other	324
Gross Asset Value, End of Period	19,305
Accumulated Amortization, Beginning of Period	(8,295)
Amortization	0
Foreign currency translation adjustments and other	(102)
Accumulated Amortization, End of Period	(8,397)
Net Book Value	10,908	10,686
Patents and technology
Finite-Lived Intangible Assets [Line Items]
Gross Asset Value, Beginning of Period	61,618
Foreign currency translation adjustments and other	1,668
Gross Asset Value, End of Period	63,286
Accumulated Amortization, Beginning of Period	(35,203)
Amortization	(368)
Foreign currency translation adjustments and other	(727)
Accumulated Amortization, End of Period	(36,298)
Net Book Value	26,988	26,415
Other
Finite-Lived Intangible Assets [Line Items]
Gross Asset Value, Beginning of Period	37,256
Foreign currency translation adjustments and other	3,862
Gross Asset Value, End of Period	41,118
Accumulated Amortization, Beginning of Period	(17,462)
Amortization	(1,088)
Foreign currency translation adjustments and other	(545)
Accumulated Amortization, End of Period	(19,095)
Net Book Value	$ 22,023	$ 19,794