Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated other comprehensive loss - interest rate swaps	$ (565)	$ (514)	$ (590)
Accumulated other comprehensive - postretirement liabilities	477	483	594
Accumulated other comprehensive loss - total	(88)	(31)	4
Unrealized loss on interest rate swaps	(476)	(412)	(484)
Reclassification of loss into earnings from interest rate swaps	98	268	560
Amortization of unrealized losses on dedesignated interest rate swaps	289	93	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	(20)	(67)	(2)
Reclassification of net actuarial gain into earnings from postretirement benefit plans	(27)	(18)	(59)
Reclassification of prior service credits into earnings from postretirement benefit plans	(54)	(55)	(54)
Accumulated other comprehensive loss - interest rate swaps	(654)	(565)	(514)
Accumulated other comprehensive - postretirement liabilities	416	477	483
Accumulated other comprehensive loss - total	(238)	(88)	(31)
Unrealized gain (loss) on interest rate swaps - income taxes	291	253	297
Reclassification of loss into earnings from interest rate swaps - income taxes	60	165	344
Amortization of unrealized loss on dedesignated interest rate swap - income taxes	178	57	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Tax	(13)	(41)	(1)
Reclassification of net actuarial gain into earnings from postretirement benefit plans - income taxes	18	11	36
Reclassification of prior service credits into earnings from postretirement benefit plans - income taxes	$ 34	$ 33	$ 34