Facility Consolidation and Severance Expenses, Net (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 26, 2020	Sep. 28, 2019
Restructuring Cost and Reserve [Line Items]
Accrued Balance		$ 343	$ 944
Expenses to Date	[1]	1,785	4,859
Cash Payments		1,863	5,390
Accrued Balance		265	413
Total Costs Incurred To Date		11,414
Expected Cost Remaining		11,414
2015 Corporate Office Consolidation Plan [Member]
Restructuring Cost and Reserve [Line Items]
Accrued Balance		38	98
Expenses to Date	[1]	5	11
Cash Payments		43	63
Accrued Balance		0	46
Total Costs Incurred To Date		834
Expected Cost Remaining		834
2017 Profit Improvement Plan [Member]
Restructuring Cost and Reserve [Line Items]
Accrued Balance		305	846
Expenses to Date	[1]	391	4,848
Cash Payments		589	5,327
Accrued Balance		107	367
Total Costs Incurred To Date		9,191
Expected Cost Remaining		9,191
2020 COVID-19 Continuity Plan [Member]
Restructuring Cost and Reserve [Line Items]
Accrued Balance		0
Expenses to Date	[1]	1,389
Cash Payments		1,231
Accrued Balance		158
Total Costs Incurred To Date		1,389
Expected Cost Remaining	[2]	1,389
Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Accrued Balance		0	0
Expenses to Date		0	3
Cash Payments		0	0
Accrued Balance		0	$ 0
Total Costs Incurred To Date		3,323
Expected Cost Remaining		$ 3,323

[1] Costs incurred under these plans are classified as "facility consolidation and severance expenses, net" in the Company's Consolidated Condensed Statements of Operations.

[2] The total additional expected costs under the COVID-19 Continuity Plan cannot be reasonably estimated at this time due to the fluid nature of the COVID-19 outbreak and the unpredictable future impact upon our business.