Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Abstract]
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	236	(476)	(412)
Reclassification of loss into earnings from interest rate swaps	176	98	268
Amortization of unrealized loss on dedesignated interest rate swaps	98	289	93
Unrecognized net actuarial gain on postretirement benefit plans	20	20	67
Reclassification of net actuarial gain into earnings from postretirement benefit plans	(22)	(27)	(18)
Reclassification of prior service credits into earnings from postretirement benefit plans	(54)	(54)	(55)
Accumulated other comprehensive loss - interest rate swaps	(144)	(654)	(565)
Accumulated other comprehensive - postretirement liabilities	360	416	477
Accumulated other comprehensive loss - total	216	(238)	(88)
Unrealized gain (loss) on interest rate swaps - income taxes	145	(291)	(253)
Reclassification of loss into earnings from interest rate swaps - income taxes	108	60	165
Amortization of unrealized loss on dedesignated interest rate swap - income taxes	60	178	57
Unrecognized net actuarial gain on postretirement plans - income taxes	12	13	41
Reclassification of net actuarial gain into earnings from postretirement benefit plans - income taxes	(13)	(18)	(11)
Reclassification of prior service credits into earnings from postretirement benefit plans - income taxes	$ (34)	$ (34)	$ (33)