Goodwill (Schedule Of Goodwill) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill [Line Items]
Balance	$ 63,822
Goodwill acquired	2,269,906
Reclassification to utility plant acquisition adjustment	(101)
Balance	2,333,627
Water [Member] | Regulated [Member]
Goodwill [Line Items]
Balance	58,981
Goodwill acquired	2,596
Reclassification to utility plant acquisition adjustment	(101)
Balance	61,476
Natural Gas [Member] | Regulated [Member]
Goodwill [Line Items]
Goodwill acquired	2,267,310
Balance	2,267,310
Other [Member]
Goodwill [Line Items]
Balance	4,841
Goodwill acquired
Reclassification to utility plant acquisition adjustment
Balance	$ 4,841