Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross	$ 86,093	$ 87,805
Accumulated amortization	(55,813)	(48,756)
Net	30,280	39,049
Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived intangibles	$ 9,782	9,972
Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (years)	6 years 6 months
Gross	$ 80	80
Accumulated amortization	(45)	(40)
Net	$ 35	40
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (years)	1 year 6 months
Gross	$ 39,521	41,043
Accumulated amortization	(31,896)	(27,396)
Net	$ 7,625	13,647
Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (years)	5 years 2 months 12 days
Gross	$ 24,980	24,980
Accumulated amortization	(12,142)	(9,590)
Net	$ 12,838	15,390
Patents [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (years)	0 years
Gross	$ 11,730	11,730
Accumulated amortization	$ (11,730)	$ (11,730)