Goodwill and Other Intangibles - Other Intangibles (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Asset Value, Beginning of Period	$ 557,167
Foreign currency translation adjustments and other	(3,279)
Gross Asset Value, End of Period	553,888
Accumulated Amortization, Beginning of Period	(135,664)
Amortization	(14,422)
Foreign currency translation adjustments and other	1,705
Accumulated Amortization, End of Period	(148,381)
Net Book Value	405,507	$ 421,503
Other intangibles classified as assets held for sale		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	(5,157)
Gross Asset Value, End of Period	434,155
Accumulated Amortization, Beginning of Period	(74,704)
Amortization	(11,896)
Foreign currency translation adjustments and other	1,194
Accumulated Amortization, End of Period	(85,406)
Net Book Value	348,749	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	(200)
Gross Asset Value, End of Period	18,781
Accumulated Amortization, Beginning of Period	(8,295)
Amortization	0
Foreign currency translation adjustments and other	69
Accumulated Amortization, End of Period	(8,226)
Net Book Value	10,555	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	(4,902)
Gross Asset Value, End of Period	56,716
Accumulated Amortization, Beginning of Period	(35,203)
Amortization	(738)
Foreign currency translation adjustments and other	1,020
Accumulated Amortization, End of Period	(34,921)
Net Book Value	21,795	26,415
Other
Finite-Lived Intangible Assets [Line Items]
Gross Asset Value, Beginning of Period	37,256
Foreign currency translation adjustments and other	6,980
Gross Asset Value, End of Period	44,236
Accumulated Amortization, Beginning of Period	(17,462)
Amortization	(1,788)
Foreign currency translation adjustments and other	(578)
Accumulated Amortization, End of Period	(19,828)
Net Book Value	$ 24,408	$ 19,794