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Other Expense, Net (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Other Income and Expenses [Abstract]        
Interest income $ 48 $ 51 $ 308 $ 233
Other nonoperating income 1 3 6 34
Insurance policy expense (164) (127) (372) (320)
Other expense, net $ (115) $ (73) $ (58) $ (53)