Goodwill (Schedule Of Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Goodwill [Line Items]
Balance	$ 63,822
Goodwill acquired	2,287,795
Reclassification to utility plant acquisition adjustment	(91)
Balance	2,351,526
Water [Member] | Regulated [Member]
Goodwill [Line Items]
Balance	58,981
Goodwill acquired	118
Reclassification to utility plant acquisition adjustment	(91)
Balance	59,008
Natural Gas [Member] | Regulated [Member]
Goodwill [Line Items]
Goodwill acquired	2,287,677
Balance	2,287,677
Other [Member]
Goodwill [Line Items]
Balance	4,841
Goodwill acquired
Reclassification to utility plant acquisition adjustment
Balance	$ 4,841