Goodwill and Intagible Assets Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 22		$ 100
Amortization of Intangible Assets	$ 958	$ 1,096	3,101	$ 3,266
General and administrative
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	584	721	1,938	2,169
Cost of service sales
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 374	$ 375	$ 1,163	$ 1,097