Discontinued Operations (Selected Financial Information Included In Earnings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 25, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of tax	$ (2,556)	$ (368)
Banking Security Systems Integration Business Unit [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue		3,700
Gross profit		567
Selling, general, and administrative expenses		887
Operating loss		(320)
Loss from discontinued operations before income taxes		(320)
Loss from discontinued operations, net of tax		(320)
Checkview Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue	12,543	18,103
Gross profit	(25)	3,336
Selling, general, and administrative expenses	2,318	3,372
Research and development	79	92
Operating loss	(2,422)	(128)
Loss from discontinued operations before income taxes	(2,422)	(128)
Loss from discontinued operations, net of tax	$ (2,556)	$ (48)