Discontinued Operations (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2010	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax gain (loss) on disposal of business unit		$ (302,000)	$ 613,000	$ (374,000)	$ 521,000
(Benefit from) provision for income taxes on discontinued operations and dispositions		(873,000)	(590,000)	(1,248,000)	(916,000)
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		(45,000)	244,000	(117,000)	28,000
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		0	369,000	0	493,000
Microarray-based diagnostic testing laboratory in the United States [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		(257,000)	0	(257,000)	0
Disposal Group, Including Discontinued Operations, Severance Costs		$ 1,000,000