Employee Benefit Plans (Defined Contribution Plans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Non-Collective-Bargaining Plan [Member]
Defined Contribution Plans [Line Items]
Percentage of Employees Covered			84.00%
Employer Matching Contribution, Percentage			1.00%
Employer Matching Contribution, Discretionary Percentage			2.00%
Maximum Annual Contribution Per Employee, Percentage			3.00%
Cost Recognized	$ 95	$ 112	$ 318	$ 343
Collective-Bargaining Plan [Member]
Defined Contribution Plans [Line Items]
Percentage of Employees Covered			16.00%
Maximum Annual Contribution Per Employee, Percentage			2.75%
Cost Recognized	$ 32	$ 27	$ 109	$ 94