Discontinued Operations (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2010	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax gain (loss) on disposal of business unit		$ 613,000	$ 482,000	$ 521,000	$ 1,017,000
(Benefit from) provision for income taxes on discontinued operations and dispositions		(376,000)	417,000	(395,000)	459,000
Photoflash Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceed from business divestiture	13,500,000
Pre-tax gain (loss) on disposal of business unit		369,000	485,000	493,000	992,000
Other Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax gain (loss) on disposal of business unit		$ 244,000	$ (3,000)	$ 28,000	$ 25,000