Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Dec. 28, 2013
Operating results from discontinued operations
Income (loss) from operations of discontinued businesses, net of taxes	$ (270)	$ (155)
Assets and liabilities of discontinued operations
Current assets	677		750
Long-term assets	2,970		3,151
Current liabilities	1,747		1,931
Long-term liabilities	7,615		8,080
Phase I Clinical [Member]
Operating results from discontinued operations
Facility lease payments	11,070
Income (loss) from operatoins of discontinued businesses, before income taxes	(25)	(220)
Provision (benefit) for income taxes	245	(65)
Income (loss) from operations of discontinued businesses, net of taxes	(270)	(155)
Assets and liabilities of discontinued operations
Current assets	677		750
Long-term assets	2,970		3,151
Total assets	3,647		3,901
Current liabilities	1,747		1,931
Long-term liabilities	7,615		8,080
Total liabilities	9,362		10,011
Guarantor Obligations, Current Carrying Value	$ 9,345