Pension Benefits (Details) (USD $)	3 Months Ended
	Mar. 25, 2012	Mar. 27, 2011
Pension Benefits [Abstract]
Service cost	$ 217,000	$ 237,000
Interest cost	986,000	1,081,000
Expected return on plan assets	10,000	38,000
Amortization of actuarial loss	57,000	12,000
Amortization of transition obligation	14,000	32,000
Amortization of prior service costs	1,000	1,000
Net periodic pension cost	1,285,000	1,401,000
Estimated employer contributions	4,800,000
Pension contributions	$ 1,500,000