Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013		Mar. 31, 2012
Unrealized gain (loss) on interest rate swaps:
Before income taxes	$ 20		$ (130)
Income taxes	8		(49)
Net of taxes	12		(81)
Reclassification of loss into earnings from interest rate swaps (1):
Before income taxes	35	[1]	37	[1]
Income taxes	13		14
Net of taxes	22		23
Amortization of unrealized loss on dedesignated interest rate swaps (1):
Before income taxes	110	[1]	119	[1]
Income taxes	42		45
Net of taxes	68		74
Reclassification of net actuarial gain into earnings from postretirement benefit plans (2):
Before income taxes	(10)	[2]	(10)	[2]
Income taxes	(4)		(4)
Net of taxes	(6)		(6)
Reclassification of prior service credits into earnings from postretirement benefit plans (2):
Before income taxes	(22)	[2]	(22)	[2]
Income taxes	(8)		(9)
Net of taxes	(14)		(13)
Other comprehensive income (loss)	$ 82		$ (3)

[1] Amounts for cash flow hedges reclassified from accumulated other comprehensive income (loss) to net earnings (loss) were included in interest expense in the Company's Consolidated Condensed Statement of Operations.

[2] Amounts for postretirement plans reclassified from accumulated other comprehensive income (loss) to net earnings (loss) were included in selling and administrative expenses in the Company's Consolidated Condensed Statement of Operations.