Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 27, 2014		Sep. 28, 2013		Sep. 27, 2014	Sep. 28, 2013
Unrealized gain (loss) on interest rate swaps:
Before income taxes	$ (24)		$ (674)		$ (2,003)	$ (275)
Income taxes	(9)		(256)		(761)	(104)
Net of taxes	(15)		(418)		(1,242)	(171)
Reclassification of loss into earnings from interest rate swaps (1):
Before income taxes	86	[1]	84	[1]	259	199
Income taxes	32		32		99	75
Net of taxes	54		52		160	124
Amortization of unrealized loss on dedesignated interest rate swaps (1):
Before income taxes	0	[1]	0	[1]	0	158
Income taxes	0		0		0	60
Net of taxes	0		0		0	98
Reclassification of net actuarial gain into earnings from postretirement benefit plans (2):
Before income taxes	(10)	[2]	(10)	[2]	(30)	(29)
Income taxes	(4)		(4)		(12)	(11)
Net of taxes	(6)		(6)		(18)	(18)
Reclassification of prior service credits into earnings from postretirement benefit plans (2):
Before income taxes	(22)	[2]	(22)	[2]	(66)	(66)
Income taxes	(8)		(8)		(25)	(25)
Net of taxes	(14)		(14)		(41)	(41)
Other comprehensive income (loss)	$ 19		$ (386)		$ (1,141)	$ (8)

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