Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Other Intangible Assets
Gross Carrying Amount	$ 121,302		$ 121,302		$ 121,302
Accumulated Amortization	(59,433)		(59,433)		(54,359)
Total amortization expense	61,869		61,869		66,943
Amortization expense	1,698	$ 1,711	5,122	$ 4,860
Customer lists/relationships
Other Intangible Assets
Gross Carrying Amount	64,323		64,323		64,323
Accumulated Amortization	(36,237)		(36,237)		(33,685)
Total amortization expense	28,086		28,086		30,638
Patents
Other Intangible Assets
Gross Carrying Amount	10,319		10,319		10,319
Accumulated Amortization	(10,319)		(10,319)		(10,319)
Total amortization expense	0		0		0
Technology and other intangibles
Other Intangible Assets
Gross Carrying Amount	44,460		44,460		44,460
Accumulated Amortization	(12,877)		(12,877)		(10,355)
Total amortization expense	31,583		31,583		34,105
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