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Accumulated Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss)) (Parentheticals) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gain on interest rate swaps $ 0 $ (22) $ 0 $ (137)
Reclassification of loss into earnings from interest rate swaps 0 110 0 369
Reclassification of net actuarial gain into earnings from postretirement benefit plans 0 (3) 0 (9)
Reclassification of prior service credits into earnings from postretirement benefit plans $ 0 $ 0 0 $ (1)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gain on interest rate swaps     0  
Reclassification of loss into earnings from interest rate swaps     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