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Other Income (Expense), Net (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Other Income and Expenses [Abstract]        
Interest income $ 73 $ 48 $ 313 $ 308
Other nonoperating income 1 1 1 6
Insurance policy expense (8) (164) (336) (372)
Other income (expense), net $ 66 $ (115) $ (22) $ (58)