Income Taxes (Schedule Of Components Of Income Tax Expense By Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Abstract]
Statutory income tax expense	$ 134,636	$ 56,730	$ 27,844
State income tax expense, net of federal income tax expense	24,123	11,153	5,483
Executive compensation	3,520	4,566	4,123
Excess tax benefits upon vesting of share based payment awards	(764)	(108)	(252)
Federal energy credits	(16,451)	(8,549)	(17,256)
State tax credits	(1,220)	(900)
Other	(1,226)	1,191	(301)
Income tax expense	$ 142,618	$ 64,083	$ 19,641