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General (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2017
Jun. 30, 2016
Jun. 29, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Beginning Balance, Swap Agreements       $ 9
Other comprehensive loss before reclassifications, Swap Agreements $ 0 $ (28) $ 0 (143)
Amounts reclassified from accumulated other comprehensive loss, Swap Agreements [1]       134
Net other comprehensive income (loss), Swap Agreements       (9)
Ending Balance, Swap Agreements   0   0
Beginning Balance, Available for Sale Investments     3 (11)
Change in unrealized gain on available for sale investments, Available for Sale Investments     (14)  
Other comprehensive loss before reclassifications, Available for Sale Investments       0
Amounts reclassified from accumulated other comprehensive loss, Available for Sale Investments [1]       0
Net other comprehensive income (loss), Available for Sale Investments 0 0 (14) 0
Ending Balance, Available for Sale Investments (11) (11) (11) (11)
Beginning Balance, Pension Obligation     (5,069) (5,219)
Other comprehensive loss before reclassifications, Pension Obligation       0
Amortization of net actuarial loss and prior service credit, Pension Obligation 53 0 107 0
Amounts reclassified from accumulated other comprehensive loss, Pension Obligation [1]       0
Net other comprehensive income (loss), Pension Obligation     107 0
Ending Balance, Pension Obligation (4,962) (5,219) (4,962) (5,219)
Beginning Balance, Accumulated Other Comprehensive Loss     (5,066) (5,221)
Change in unrealized gain on available for sale investments, Accumulated Other Comprehensive Loss 0 0 (14) 0
Other comprehensive loss before reclassifications, Accumulated Other Comprehensive Loss       (143)
Amortization of net actuarial loss and prior service credit, Accumulated Other Comprehensive Loss 53 0 107 0
Amounts reclassified from accumulated other comprehensive loss, Accumulated Other Comprehensive Loss [1]       134
Net other comprehensive income (loss), Accumulated Other Comprehensive Loss 53 86 93 (9)
Ending Balance, Accumulated Other Comprehensive Loss $ (4,973) $ (5,230) $ (4,973) $ (5,230)
[1] Amounts are included in interest expense in the consolidated statements of earnings.