Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Other Intangible Assets
Gross Carrying Amount	$ 121,302		$ 121,302
Accumulated Amortization	(56,056)		(54,359)
Total amortization expense	65,246		66,943
Amortization expense	1,720	$ 1,536
Customer lists/relationships
Other Intangible Assets
Gross Carrying Amount	64,323		64,323
Accumulated Amortization	(34,536)		(33,685)
Total amortization expense	29,787		30,638
Patents
Other Intangible Assets
Gross Carrying Amount	10,319		10,319
Accumulated Amortization	(10,319)		(10,319)
Total amortization expense	0		0
Technology and other intangibles
Other Intangible Assets
Gross Carrying Amount	44,460		44,460
Accumulated Amortization	(11,201)		(10,355)
Total amortization expense	33,259		34,105
In process research and development
Other Intangible Assets
Gross Carrying Amount			2,200
Total amortization expense	2,200		$ 2,200
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 2,200