Net Income Per Common Share (Schedule Of Earnings Per Share) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net Income Per Common Share [Abstract]
Average common shares outstanding during the period for basic computation	264,418,000	262,099,000	264,306,000	262,026,000
Effect of dilutive securities:
Employee stock-based compensation	400,000	459,000	534,000	519,000
Average common shares outstanding during the period for diluted computation	264,818,000	262,558,000	264,840,000	262,545,000