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Income Taxes (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred tax assets:      
Accrued compensation and benefits $ 1,808 $ 1,520  
Inventory valuation reserves 2,771 1,938  
Benefit plan reserves 9,468 9,126  
Capital tax loss carryforwards 2,034 2,054  
Net operating loss carryforwards 788 1,061  
Other accrued expenses 2,480 2,222  
Unrealized foreign exchange 58 346  
Gross deferred tax assets 19,407 18,267  
Valuation allowance (2,329) (3,115)  
Net deferred tax assets 17,078 15,152  
Deferred tax liabilities:      
Depreciation and other basis differences (5,276) (4,602)  
Intangibles (3,571) (2,706)  
Other (90) (307)  
Deferred tax liabilities (8,937) (7,615)  
Net deferred tax assets 8,141 7,537  
Change in net deferred tax assets:      
Deferred income tax benefit (2,927) (688) (900)
Items of other comprehensive income (loss) (1,033) 2,175  
Currency translation (254) (49)  
Deferred tax balances from business acquisition (1,036) 0  
Total change in net deferred tax assets $ 604 $ 2,814