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Other Operating (Income) Expenses, net (Tables)
12 Months Ended
Dec. 31, 2014
Other Operating (Income) Expenses, net [Abstract]  
Schedule of Other Operating Expenses (Income), Net

Other operating (income) expenses, net consist of the following:

 

Year ended December 31, 2014     2013     2012  
                         
Gain on sale of operating assets   $ (1   $ (65 )   $ (27 )
Frozen defined-benefit pension plan (income) expense     (1,611     (336 )     320  
Total other operating (income) expenses, net   $ (1,612   $ (401 )   $ 293