Employee Benefit Plans (Defined Contribution Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Non-Collective-Bargaining Plan [Member]
Defined Contribution Plans [Line Items]
Percentage of Employees Covered	85.00%
Employer Matching Contribution, Percentage	1.00%
Employer Matching Contribution, Discretionary Percentage	2.00%
Maximum Annual Contribution Per Employee, Percentage	3.00%
Cost Recognized	$ 418	$ 448	$ 484
Collective-Bargaining Plan [Member]
Defined Contribution Plans [Line Items]
Percentage of Employees Covered	15.00%
Maximum Annual Contribution Per Employee, Percentage	2.75%
Cost Recognized	$ 143	$ 123	$ 125