Commitments And Contingencies (Schedule Of Rent Expense Under Operating Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Commitments And Contingencies [Abstract]
Long Term Purchase Agreement	$ 5,867	$ 5,931	$ 6,577
Purchased water under long-term agreements	1,017	1,006	$ 989
Water treatment expense under contractual agreement	$ 340,262	$ 165,745