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General (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 28, 2017
Sep. 29, 2016
Sep. 28, 2017
Sep. 29, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Beginning Balance, Swap Agreements       $ 9
Other comprehensive loss before reclassifications, Swap Agreements $ 0 $ 0 $ 0 (143)
Amounts reclassified from accumulated other comprehensive loss, Swap Agreements [1]       134
Net other comprehensive 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)
Amortization of the net actuarial loss and prior service credit, Pension Obligation 54 163 161 163
Other comprehensive loss before reclassifications, Pension Obligation       0
Amounts reclassified from accumulated other comprehensive loss, Pension Obligation [1]       0
Net other comprehensive income (loss), Pension Obligation     161 163
Ending Balance, Pension Obligation (4,908) (5,056) (4,908) (5,056)
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
Amortization of net actuarial loss and prior service credit, Accumulated Other Comprehensive Loss 54 163 161 163
Other comprehensive loss before reclassifications, Accumulated Other Comprehensive Loss       (143)
Amounts reclassified from accumulated other comprehensive loss, Accumulated Other Comprehensive Loss [1]       134
Net other comprehensive income (loss), Accumulated Other Comprehensive Loss 54 163 147 154
Ending Balance, Accumulated Other Comprehensive Loss $ (4,919) $ (5,067) $ (4,919) $ (5,067)
[1] Amounts are included in interest expense in the consolidated statements of earnings.