Financial Instruments (Summary Of Unrealized Gain And Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Financial Instruments [Abstract]
Net gain (loss) recognized during the period on equity securities	$ 211	$ (459)	$ 342	$ (737)
Less: net gain / loss recognized during the period on equity securities sold during the period
Unrealized gain (loss) recognized during the reporting period on equity securities still held at the reporting date	$ 211	$ (459)	$ 342	$ (737)