Acquisition Acquisition (Details) - USD ($) $ in Thousands		9 Months Ended
	Sep. 15, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Business Combination, Consideration	$ 3,500
Acquisitions	3,150	$ 3,150	$ 1,359
Consideration, Amount of holdback	300
Goodwill		$ 51,088		$ 48,678
Veri [Member]
Business Acquisition [Line Items]
Goodwill	2,400
Technology-Based Intangible Assets [Member] | Veri [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 1,100