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Other Operating Expenses (Income), net (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Operating Expenses (Income), net [Abstract]      
(Gain) loss on sale of operating assets $ (27) $ (83) $ 22
Frozen defined-benefit pension plan expense (income) 320 (236) 398
Total other operating expenses (income), net $ 293 $ (319) $ 420