3. Employee Retirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013	Oct. 15, 2014
Lien against assets of the company for unpaid pension contributions					$ 6,307
Estimated Future Employer Contributions in Next Fiscal Year			3,900
Reclassification of pension expense to net income (loss)	101	182	305	546
Supplemental Executive Retirement Plan
Estimated Future Employer Contributions in Next Fiscal Year			$ 519