General (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 30, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning Balance, Swap Agreements			$ 9
Other comprehensive loss before reclassifications, Swap Agreements		$ 0	(115)
Amounts reclassified from accumulated other comprehensive loss, Swap Agreements	[1]		20
Net other comprehensive income (loss), Swap Agreements			(95)
Ending Balance, Swap Agreements			(86)
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		(14)	0
Ending Balance, Available for Sale Investments		(11)	(11)
Beginning Balance, Pension Obligation		(5,069)	(5,219)
Other comprehensive loss before reclassifications, Pension Obligation			0
Amortization of the net actuarial loss and prior service credit, Pension Obligation		54	0
Amounts reclassified from accumulated other comprehensive loss, Pension Obligation	[1]		0
Net other comprehensive income (loss), Pension Obligation		54	0
Ending Balance, Pension Obligation		(5,015)	(5,219)
Beginning Balance, Accumulated Other Comprehensive Loss		(5,066)	(5,221)
Other comprehensive loss before reclassifications, Accumulated Other Comprehensive Loss			(115)
Amounts reclassified from accumulated other comprehensive loss, Accumulated Other Comprehensive Loss			20
Amortization of the net actuarial loss and prior service credit, Accumulated Other Comprehensive Loss		54	0
Net other comprehensive income (loss), Accumulated Other Comprehensive Loss		40	(95)
Change in unrealized gain on available for sale investments, net of tax benefit of $9 and $0, respectively		(14)	0
Ending Balance, Accumulated Other Comprehensive Loss		$ (5,026)	$ (5,316)

[1] Amount is included in interest expense in the consolidated statement of earnings.