Shareholders' Equity Amounts Reclassified from Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jul. 01, 2012		Jun. 30, 2013		Jul. 01, 2012
Tax (expense) benefit	$ 0		$ 0		$ 0		$ 0
Net of tax	1,330		976		2,664		1,953
Accumulated Defined Benefit Plans Adjustment [Member]
Transition asset	(26)	[1]	(34)	[1]	(52)	[1]	(68)	[1]
Actuarial loss	1,395	[1]	1,051	[1]	2,795	[1]	2,104	[1]
Prior service cost	(39)	[1]	(41)	[1]	(79)	[1]	(83)	[1]
Total before tax	1,330		976		2,664		1,953
Tax (expense) benefit	0	[2]	0	[2]	0	[2]	0	[2]
Net of tax	$ 1,330		$ 976		$ 2,664		$ 1,953

[1] These components of accumulated other comprehensive loss are included in the computation of net periodic pension cost (see Note 9, Pension and Other Postretirement Benefits, for additional details), which is included in Selling, general and administrative expense in our Condensed Consolidated Statements of Operations.

[2] For three and six months ended June 30, 2013 and July 1, 2012, we have a full valuation allowance recorded against our deferred tax assets. Accordingly, we do not incur any tax expense or realize any tax benefits related to our pension plan activity.