Financial Instruments (Summary Of Unrealized Gain And Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financial Instruments [Abstract]
Net gain recognized during the period on equity securities	$ 421	$ 131
Less: net gain recognized during the period on equity securities sold during the period
Unrealized gain recognized during the reporting period on equity securities still held at the reporting date	$ 421	$ 131