Components of Deferred Tax Asset and Liability (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Accounts receivable	$ 108	$ 106
Inventories	591	733
Net operating loss carryforwards	4,268	4,429
Other accrued liabilities	1,679	1,619
Pension	9,454	8,048
Tax Credits	3,442	6,061
Total deferred tax assets	19,542	20,996
Deferred tax liabilities:
Domestic liability of foreign assets	448	766
Intangible assets	6,121	6,015
Property, plant and equipment	8,341	9,379
Total deferred tax liabilities	14,910	16,160
Valuation allowance	3,587	7,132
Net deferred tax liabilities	$ 1,045	$ (2,296)