Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Other Intangible Assets
Gross Carrying Amount	$ 110,983		$ 110,983
Accumulated Amortization	(52,489)		(50,803)
Total amortization expense	58,494		60,180
Amortization expense	1,690	$ 1,720
Customer lists/relationships
Other Intangible Assets
Gross Carrying Amount	64,323		64,323
Accumulated Amortization	(37,936)		(37,088)
Total amortization expense	26,387		27,235
Technology and other intangibles
Other Intangible Assets
Gross Carrying Amount	44,460		44,460
Accumulated Amortization	(14,553)		(13,715)
Total amortization expense	29,907		30,745
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