Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Other Intangible Assets
Gross Carrying Amount	$ 110,983		$ 110,983		$ 110,983
Accumulated Amortization	(54,178)		(54,178)		(50,803)
Total amortization expense	56,805		56,805		60,180
Amortization expense	1,692	$ 1,704	3,382	$ 3,424
Customer lists/relationships
Other Intangible Assets
Gross Carrying Amount	64,323		64,323		64,323
Accumulated Amortization	(38,787)		(38,787)		(37,088)
Total amortization expense	25,536		25,536		27,235
Technology and other intangibles
Other Intangible Assets
Gross Carrying Amount	44,460		44,460		44,460
Accumulated Amortization	(15,391)		(15,391)		(13,715)
Total amortization expense	29,069		29,069		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