Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated other comprehensive loss - interest rate swaps			$ (565)
Accumulated other comprehensive - postretirement liabilities			477
Accumulated other comprehensive loss - total			(88)
Unrealized loss on interest rate swaps	(142)	(175)	(465)	(307)
Reclassification of loss into earnings from interest rate swaps	23	85	71	257
Amortization of unrealized losses on dedesignated interest rate swaps	73	13	219	13
Reclassification of net actuarial gain into earnings from postretirement benefit plans	(6)	(4)	(17)	(13)
Reclassification of prior service credits into earnings from postretirement benefit plans	(14)	(14)	(40)	(41)
Accumulated other comprehensive loss - interest rate swaps	(740)		(740)
Accumulated other comprehensive - postretirement liabilities	420		420
Accumulated other comprehensive loss - total	(320)		(320)
Unrealized gain (loss) on interest rate swaps - income taxes	88	107	283	188
Reclassification of loss into earnings from interest rate swaps - income taxes	14	52	43	158
Amortization of unrealized loss on dedesignated interest rate swap - income taxes	45	8	134	8
Reclassification of net actuarial gain into earnings from postretirement benefit plans - income taxes	4	3	12	8
Reclassification of prior service credits into earnings from postretirement benefit plans - income taxes	$ 8	$ 8	$ 26	$ 26