Acquisitions - Narrative (Details) $ in Thousands			1 Months Ended
	Apr. 01, 2017 USD ($)	Feb. 01, 2017 USD ($) period	Jul. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Business combination, contingent consideration arrangements, range of outcomes, value, high				$ 22,967
Business acquisition, contingent consideration accounts payable				6,000	$ 3,600
Business acquisition, contingent consideration other long term liability				3,900	$ 1,700
McKinney Rogers
Business Acquisition [Line Items]
Payments to acquire businesses, gross		$ 3,193
Business combination, contingent consideration arrangements, range of outcomes, value, high		$ 18,000		$ 12,967
Business combination, contingent consideration, term of earnings targets		5 months
Number of twelve-month earnings target Measurement Periods | period		3
Emantras
Business Acquisition [Line Items]
Payments to acquire businesses, gross	$ 3,191
Business combination, contingent consideration arrangements, range of outcomes, value, high	$ 300
Target Earnings Measurement Period One | McKinney Rogers
Business Acquisition [Line Items]
Business combination, contingent consideration, amount contingent upon achievement of certain earnings targets		$ 6,000
Target Earnings Measurement Period Two | McKinney Rogers
Business Acquisition [Line Items]
Business combination, contingent consideration, amount contingent upon achievement of certain earnings targets		$ 12,000
Subsequent Event [Member] | Target Earnings Measurement Period One | McKinney Rogers
Business Acquisition [Line Items]
Contingent consideration paid			$ 1,000