Acquisitions - Manatee Works Inc. Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Revaluation of contingent consideration	$ (3)	$ (28)	$ (463)
Payment of contingent consideration	$ 1,000	$ 1,926	$ 337