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General (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 25, 2015
Jun. 30, 2016
Jun. 25, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Beginning Balance, Swap Agreements     $ 9 $ 116
Other comprehensive loss before reclassifications, Swap Agreements $ (28) $ (33) (143) (169)
Amounts reclassified from accumulated other comprehensive loss, Swap Agreements     134 59
Net other comprehensive loss, Swap Agreements     (9) (110)
Ending Balance, Swap Agreements 0 6 0 6
Beginning Balance, Available for Sale Investments     (11) (11)
Other comprehensive loss before reclassifications, Available for Sale Investments     0 0
Amounts reclassified from accumulated other comprehensive loss, Available for Sale Investments     0 0
Net other comprehensive loss, Available for Sale Investments     0 0
Ending Balance, Available for Sale Investments (11) (11) (11) (11)
Beginning Balance, Pension Obligation     (5,219) (4,580)
Amortization of the net actuarial loss and prior service credit, pension obligation 0 199 0 199
Other comprehensive loss before reclassifications, Pension Obligation 0 (902) 0 (902)
Amounts reclassified from accumulated other comprehensive loss, Pension Obligation     0 0
Net other comprehensive income loss, Pension Obligation     0 (703)
Ending Balance, Pension Obligation (5,219) (5,283) (5,219) (5,283)
Beginning Balance, Accumulated Other Comprehensive Loss     (5,221) (4,475)
Amortization of the net actuarial loss and prior service credit, accumulated other comprehensive loss       199
Other comprehensive loss before reclassifications, Accumulated Other Comprehensive Loss     (143) (1,071)
Amounts reclassified from accumulated other comprehensive loss, Accumulated Other Comprehensive Loss     134 59
Other comprehensive income (loss) 86 (707) (9) (813)
Ending Balance, Accumulated Other Comprehensive Loss $ (5,230) $ (5,288) $ (5,230) $ (5,288)