Goodwill (Schedule Of Goodwill) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Goodwill [Line Items]
Balance	$ 63,822
Goodwill acquired	2,269,555
Reclassification to utility plant acquisition adjustment	(91)
Other	249
Balance	2,333,535
Water [Member] | Regulated [Member]
Goodwill [Line Items]
Balance	58,981
Goodwill acquired	118
Reclassification to utility plant acquisition adjustment	(91)
Other	249
Balance	59,257
Natural Gas [Member] | Regulated [Member]
Goodwill [Line Items]
Goodwill acquired	2,269,437
Balance	2,269,437
Other [Member]
Goodwill [Line Items]
Balance	4,841
Goodwill acquired
Reclassification to utility plant acquisition adjustment
Other
Balance	$ 4,841