Accumulated Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss - total	$ (108)	$ (1,299)	$ (1,960)
Unrealized gain (loss) on interest rate swaps	(1,109)	531	112
Reclassification of loss into earnings from interest rate swaps	444	673	775
Unrecognized net actuarial gain on postretirement benefit plans	(6)	18	7
Reclassification of net actuarial gain into earnings from postretirement benefit plans	(27)	(27)	(19)
Reclassification of prior service credits into earnings from postretirement benefit plans	(2)	(4)	(3)
Reclassification of stranded tax effects			(211)
Accumulated other comprehensive loss - total	(808)	(108)	(1,299)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss - total	(383)	(1,587)	(2,216)
Unrealized gain (loss) on interest rate swaps	(1,109)	531	112
Reclassification of loss into earnings from interest rate swaps	444	673	775
Reclassification of stranded tax effects			(258)
Accumulated other comprehensive loss - total	(1,048)	(383)	(1,587)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss - total	275	288	256
Unrecognized net actuarial gain on postretirement benefit plans	(6)	18	7
Reclassification of net actuarial gain into earnings from postretirement benefit plans	(27)	(27)	(19)
Reclassification of prior service credits into earnings from postretirement benefit plans	(2)	(4)	(3)
Reclassification of stranded tax effects			47
Accumulated other comprehensive loss - total	$ 240	$ 275	$ 288