Employee Benefit Plans (Schedule of Net Funded Status, Other Postretirement Benefit Plans) (Details) (Other Postretirement Benefit Plans, Defined Benefit [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.77%	3.86%	4.00%
Change in benefit obligations:
Projected benefit obligations at beginning of year	$ 3,342	$ 3,810
Service cost	95	106	106
Interest cost	155	135	144
Benefits Paid	(157)	(189)
Actuarial loss (gain)	141	(520)
Change in accumulated benefit obligations during the year	234	(468)
Projected benefit obligations at end of year	3,576	3,342	3,810
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	13,396	12,958
Actual return on plan assets	1,332	438
Benefits Paid	(157)	(189)
Fair value of plan assets at end of year	14,728	13,396	12,958
Net amounts recognized in the consolidated balance sheets	11,152	10,054
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	11,152	10,054
Prior service cost	0	0
Net amounts recognized in accumulated other comprehensive income	0	0
Discount rate	4.10%	4.77%
Expected rate of return on assets	7.25%	7.50%	7.75%
Retirees [Member]
Change in benefit obligations:
Projected benefit obligations at end of year	1,033	1,159	1,331
Active Employees Eligible to Retire [Member]
Change in benefit obligations:
Projected benefit obligations at end of year	424	388	470
Other Active Employees [Member]
Change in benefit obligations:
Projected benefit obligations at end of year	$ 2,119	$ 1,795	$ 2,009