Net Income Per Common Share (Schedule Of Earnings Per Share) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net Income Per Common Share [Abstract]
Average common shares outstanding during the period for basic computation	258,773	254,280	256,051	248,212
Effect of dilutive securities:
Forward equity sale agreement	223		216
Issuance of common stock from private placement				5,929
Tangible equity units		591		615
Employee stock-based compensation	441	291	496	383
Average common shares outstanding during the period for diluted computation	259,437	255,162	256,763	255,139