Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Other Intangible Assets
Gross Carrying Amount	$ 142,683		$ 142,683		$ 110,983
Accumulated Amortization	(56,177)		(56,177)		(50,803)
Total amortization expense	86,506		86,506		60,180
Amortization expense	1,999	$ 1,698	5,381	$ 5,122
Customer lists/relationships
Other Intangible Assets
Gross Carrying Amount	94,223		94,223		64,323
Accumulated Amortization	(39,888)		(39,888)		(37,088)
Total amortization expense	54,335		54,335		27,235
Technology and other intangibles
Other Intangible Assets
Gross Carrying Amount	46,260		46,260		44,460
Accumulated Amortization	(16,289)		(16,289)		(13,715)
Total amortization expense	29,971		29,971		30,745
In process research and development
Other Intangible Assets
Gross Carrying Amount					2,200
Total amortization expense	2,200		2,200		$ 2,200
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 2,200		$ 2,200