Fair Value Measurements and Financial Instruments (Details) - Fair value, measurements, recurring [Member] - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 31, 2019
Quoted prices in active markets (Level 1) [Member]
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Assets invested for self-insurance, classified as other assets, noncurrent	$ 15,359	$ 15,402
Deferred compensation	0	0
Significant other observable inputs (Level 2) [Member]
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Assets invested for self-insurance, classified as other assets, noncurrent	0	0
Deferred compensation	3,132	2,786
Significant unobservable inputs (Level 3) [Member]
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Assets invested for self-insurance, classified as other assets, noncurrent	0	0
Deferred compensation	0	0
Total carrying value [Member]
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Assets invested for self-insurance, classified as other assets, noncurrent	15,359	15,402
Deferred compensation	$ 3,132	$ 2,786