Accumulated Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss - total	$ (1,299)	$ (1,960)	$ (2,573)
Unrealized gain (loss) on interest rate swaps	531	112	(163)
Reclassification of loss into earnings from interest rate swaps	673	775	800
Unrecognized net actuarial gain on postretirement benefit plans	18	7	(2)
Reclassification of net actuarial gain into earnings from postretirement benefit plans	(27)	(19)	(20)
Reclassification of prior service credits into earnings from postretirement benefit plans	(4)	(3)	(2)
Reclassification of stranded tax effects		(211)
Accumulated other comprehensive loss - total	(108)	(1,299)	(1,960)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss - total	(1,587)	(2,216)	(2,853)
Unrealized gain (loss) on interest rate swaps	531	112	(163)
Reclassification of loss into earnings from interest rate swaps	673	775	800
Reclassification of stranded tax effects		(258)
Accumulated other comprehensive loss - total	(383)	(1,587)	(2,216)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss - total	288	256	280
Unrecognized net actuarial gain on postretirement benefit plans	18	7	(2)
Reclassification of net actuarial gain into earnings from postretirement benefit plans	(27)	(19)	(20)
Reclassification of prior service credits into earnings from postretirement benefit plans	(4)	(3)	(2)
Reclassification of stranded tax effects		47
Accumulated other comprehensive loss - total	$ 275	$ 288	$ 256