Divestiture and Discontinued Operations - Narrative (Details) - PAR Springer Miller Systems Inc - USD ($) $ in Thousands	May 05, 2017	Nov. 04, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total consideration		$ 16,600
Consideration received	$ 4,200	12,100
Consideration receivable		4,500
Contingent consideration receivable upon achievement of targets		1,500
Contingent consideration receivable upon achievement of targets, maximum per calendar year		$ 500