Pension Benefits (Details) (USD $)	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Service cost	$ 282,000	$ 268,000
Interest cost	916,000	879,000
Expected return on plan assets	0	26,000
Amortization of actuarial loss	385,000	389,000
Amortization of prior service costs	3,000	1,000
Net periodic pension cost	1,586,000	1,563,000
Estimated employer contributions	5,400,000
Pension contributions	$ 1,200,000