Employee Benefit Plans (Schedule of Net Funded Status, Other Postretirement Benefit Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.09%	3.60%	4.11%
Change in benefit obligations:
Projected benefit obligations at beginning of year	$ 2,911	$ 3,413
Service cost	87	106	$ 92
Interest cost	116	120	125
Defined Benefit Plan, Benefit Obligation, Benefits Paid	122	117
Actuarial loss (gain)	108	(611)
Change in accumulated benefit obligations during the year	189	(502)
Projected benefit obligations at end of year	3,100	2,911	3,413
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	16,279	17,374
Actual return on plan assets	2,937	(993)
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	(102)
Fair value of plan assets at end of year	19,216	16,279	$ 17,374
Net amounts recognized in the consolidated balance sheets	16,116	13,368
Assets for Plan Benefits, Defined Benefit Plan	16,116	13,368
Prior service cost	$ 0	$ 0
Discount rate	3.09%	4.09%
Expected rate of return on assets	7.25%	7.25%	7.25%
Retirees [Member]
Change in benefit obligations:
Projected benefit obligations at beginning of year	$ 583	$ 688
Projected benefit obligations at end of year	611	583	$ 688
Active Employees Eligible to Retire [Member]
Change in benefit obligations:
Projected benefit obligations at beginning of year	362	408
Projected benefit obligations at end of year	420	362	408
Other Active Employees [Member]
Change in benefit obligations:
Projected benefit obligations at beginning of year	1,966	2,317
Projected benefit obligations at end of year	$ 2,069	$ 1,966	$ 2,317