Income Taxes Components of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011
Deferred tax assets:
Inventories	$ 2,324	$ 2,309
Retirement benefits	3,464	3,731
Federal/State net operating losses	3,221	3,803
Federal/State tax credit carryforwards	2,111	2,077
Allowances for bad debts, claims and discounts	1,845	1,892
Other	5,497	5,376
Total deferred tax assets	18,462	19,188
Valuation allowance	(4,938)	(4,979)
Net deferred tax assets	13,524	14,209
Deferred tax liabilities:
Property, plant and equipment	11,733	13,153
Total deferred tax liabilities	11,733	13,153
Net deferred tax assets	1,791	1,056
Balance sheet classification:
Current deferred tax assets	5,615	5,860
Non-current deferred tax liabilities	(3,824)	(4,804)
Net deferred tax assets	$ 1,791	$ 1,056