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Accumulated Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss)) (Parentheticals) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Unrealized gain on interest rate swaps $ 0 $ 22
Reclassification of loss into earnings from interest rate swaps 0 136
Reclassification of net actuarial gain into earnings from postretirement benefit plans 0 (3)
Reclassification of prior service credits into earnings from postretirement benefit plans 0 $ 0
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