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Credit Facilities (Summary Of Costs Incurred Connection With Credit Facilities) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Credit Facilities [Abstract]        
Credit facility interest and fees incurred $ 105 $ 105 $ 315 $ 315