Retirement Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 24, 2012	Jun. 30, 2013	Jun. 24, 2012
Compensation and Retirement Disclosure [Abstract]
Benefits paid			$ 622,000
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	1,300,000		1,300,000
Service cost	67,000	61,000	134,000	122,000
Interest cost	284,000	306,000	568,000	610,000
Net amortization	134,000	65,000	269,000	131,000
Net periodic pension cost	$ 485,000	$ 432,000	$ 971,000	$ 863,000