Goodwill and Other Intangibles - Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Asset Value, Beginning of Period	$ 546,334
Foreign currency translation adjustments and other	(1,355)
Gross Asset Value, End of Period	544,979
Accumulated Amortization, Beginning of Period	(160,191)
Amortization	(6,827)
Foreign currency translation adjustments and other	540
Accumulated Amortization, End of Period	(166,478)
Net Book Value	378,501	$ 386,143
Customer lists and relationships
Finite-Lived Intangible Assets [Line Items]
Gross Asset Value, Beginning of Period	428,372
Foreign currency translation adjustments and other	(1,662)
Gross Asset Value, End of Period	426,710
Accumulated Amortization, Beginning of Period	(95,797)
Amortization	(5,808)
Foreign currency translation adjustments and other	412
Accumulated Amortization, End of Period	(101,193)
Net Book Value	325,517	332,575
Trade names and trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Asset Value, Beginning of Period	18,453
Foreign currency translation adjustments and other	(76)
Gross Asset Value, End of Period	18,377
Accumulated Amortization, Beginning of Period	(8,176)
Amortization	0
Foreign currency translation adjustments and other	25
Accumulated Amortization, End of Period	(8,151)
Net Book Value	10,226	10,277
Patents and technology
Finite-Lived Intangible Assets [Line Items]
Gross Asset Value, Beginning of Period	55,801
Foreign currency translation adjustments and other	217
Gross Asset Value, End of Period	56,018
Accumulated Amortization, Beginning of Period	(35,248)
Amortization	(355)
Foreign currency translation adjustments and other	113
Accumulated Amortization, End of Period	(35,490)
Net Book Value	20,528	20,553
Other
Finite-Lived Intangible Assets [Line Items]
Gross Asset Value, Beginning of Period	43,708
Foreign currency translation adjustments and other	166
Gross Asset Value, End of Period	43,874
Accumulated Amortization, Beginning of Period	(20,970)
Amortization	(664)
Foreign currency translation adjustments and other	(10)
Accumulated Amortization, End of Period	(21,644)
Net Book Value	$ 22,230	$ 22,738