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Accumulated Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss)) (Parentheticals) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 26, 2021
Jun. 27, 2020
Jun. 26, 2021
Jun. 27, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized loss on interest rate swaps $ 0 $ 0 $ 0 $ 0
Reclassification of loss into earnings from interest rate swaps, net of tax of $128 64 0 128 0
Reclassification of net actuarial gain into earnings from postretirement benefit plans 0 0 0 0
Reclassification of prior service credits into earnings from postretirement benefit plans $ 0 $ 0 0 $ 0
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized loss on interest rate swaps     0  
Reclassification of loss into earnings from interest rate swaps, net of tax of $128     0  
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification of net actuarial gain into earnings from postretirement benefit plans     0  
Reclassification of prior service credits into earnings from postretirement benefit plans     $ 0