Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross	$ 87,805	$ 86,614
Accumulated amortization	(48,756)	(39,746)
Net	39,049	46,868
Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived intangibles	$ 9,972	10,050
Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (years)	7 years 6 months
Gross	$ 80	80
Accumulated amortization	(40)	(34)
Net	$ 40	46
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (years)	2 years
Gross	$ 41,043	39,774
Accumulated amortization	(27,396)	(21,127)
Net	$ 13,647	18,647
Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (years)	6 years 2 months 12 days
Gross	$ 24,980	24,980
Accumulated amortization	(9,590)	(7,037)
Net	15,390	17,943
Patents [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross	11,730	11,730
Accumulated amortization	$ (11,730)	(11,548)
Net		$ 182