Employee Benefit Plans (Schedule of Net Funded Status, Other Postretirement Benefit Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
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	4.11%	4.34%	4.10%
Change in benefit obligations:
Projected benefit obligations at beginning of year	$ 3,131	$ 3,361
Service cost	92	101	$ 108
Interest cost	125	142	143
Defined Benefit Plan, Benefit Obligation, Benefits Paid	122	145
Actuarial loss (gain)	187	(329)
Change in accumulated benefit obligations during the year	282	(231)
Projected benefit obligations at end of year	3,413	3,131	3,361
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	15,453	14,353
Actual return on plan assets	1,921	1,100
Fair value of plan assets at end of year	17,374	15,453	$ 14,353
Net amounts recognized in the consolidated balance sheets	13,961	12,322
Assets for Plan Benefits, Defined Benefit Plan	13,961	12,322
Prior service cost	$ 0	$ 0
Discount rate	3.60%	4.11%
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	$ 804	$ 907
Projected benefit obligations at end of year	688	804	$ 907
Active Employees Eligible to Retire [Member]
Change in benefit obligations:
Projected benefit obligations at beginning of year	379	423
Projected benefit obligations at end of year	408	379	423
Other Active Employees [Member]
Change in benefit obligations:
Projected benefit obligations at beginning of year	1,948	2,031
Projected benefit obligations at end of year	$ 2,317	$ 1,948	$ 2,031