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Credit Facilities (Summary Of Costs Incurred Connection With Credit Facilities) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Credit Facilities [Abstract]        
Credit facility interest and fees incurred $ 105 $ 105 $ 210 $ 210