Summary Of Significant Accounting Policies (Summary Of Changes In Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Balance	$ 52,726	$ 42,230
Goodwill acquired	11,126	10,790
Reclassifications to utility plant acquisition adjustment	(30)	(139)
Other		(155)
Balance	63,822	52,726
Other Segment [Member]
Goodwill [Line Items]
Balance	4,841	4,841
Goodwill acquired
Reclassifications to utility plant acquisition adjustment
Other
Balance	4,841	4,841
Regulated [Member]
Goodwill [Line Items]
Balance	47,885	37,389
Goodwill acquired	11,126	10,790
Reclassifications to utility plant acquisition adjustment	(30)	(139)
Other		(155)
Balance	$ 58,981	$ 47,885