4. Employee Retirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 28, 2014	Mar. 28, 2014	Mar. 29, 2013	Apr. 15, 2014
Lien against assets of the company for unpaid pension contributions				$ 3,346
Estimated Future Employer Contributions in Next Fiscal Year	4,200
Reclassification of pension expense to net loss		102	182
Supplemental Executive Retirement Plan
Estimated Future Employer Contributions in Next Fiscal Year	$ 519