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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Commitments And Contingencies [Abstract]        
Total rent expense $ 194 $ 194 $ 421 $ 397