Employee Benefit Plans (Details) (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Contributions to noncontributory defined benefit plan	$ 270,000
Expected contributions to nonconributory defined benefit plan for the remainder of the year	810,000
Pension Benefits [Member]
Components of Net Periodic Benefit Cost
Service cost	213,000	263,000
Interest cost	321,000	301,000
Expected return on plan assets	(370,000)	(381,000)
Recognized net actuarial loss	79,000	151,000
Amortization of prior service cost	14,000	14,000
Net periodic benefit cost	257,000	348,000
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate (in hundredths)	4.79%	3.89%
Expected long-term return on plan assets (in hundredths)	5.75%	5.75%
Rate of compensation increase (in hundredths)	3.50%	3.50%
Other Benefits [Member]
Components of Net Periodic Benefit Cost
Service cost	69,000	53,000
Interest cost	72,000	70,000
Expected return on plan assets	(12,000)	(13,000)
Recognized net actuarial loss	9,000	21,000
Amortization of prior service cost	21,000	21,000
Net periodic benefit cost	$ 159,000	$ 152,000
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate (in hundredths)	4.23%	3.92%
Expected long-term return on plan assets (in hundredths)	0.00%	0.00%
Rate of compensation increase (in hundredths)	3.19%	3.67%