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Fair Value (Amount Of Gains And Losses From Changes In Fair Value Included In Earnings) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value [Abstract]        
Interest income $ 10 $ 25 $ 39 $ 40
Interest expense
Change in fair value 13 (2) 4 2
Total change in fair value $ 23 $ 23 $ 43 $ 42