Divestiture and Discontinued Operations (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	May 05, 2017	Nov. 04, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Operations [Abstract]
Income (loss) from discontinued operations, net of taxes			$ 0	$ 0	$ 183	$ (26)
PAR Springer Miller Systems Inc [Member]
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 payable period from closing date					18 months
Consideration could be received upon achievement of targets		1,500
Consideration could be received upon achievement of targets per year					$ 500
Assets [Abstract]
Other current assets			0		0		$ 462
Assets of discontinued operations			0		0		$ 462
Operations [Abstract]
Total revenues			0	0	0	0
Income (loss) from discontinued operations, before income taxes			0	0	284	(38)
(Provision for) benefit from income taxes			0	0	(101)	12
Income (loss) from discontinued operations, net of taxes			$ 0	$ 0	$ 183	$ (26)
PAR Springer Miller Systems Inc [Member] | Maximum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration receivable		$ 4,500