Income Taxes (Components Of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Federal
Current	$ 18,109	$ 14,190	$ 10,898
Deferred	40,413	(39,244)	10,934
Total	58,522	(25,054)	21,832
State
Current	(1,430)	1,982	955
Deferred	890	(1,815)	(579)
Total	(540)	167	376
Current	16,679	16,172	11,853
Deferred	41,303	(41,059)	10,355
Income tax expense (benefit)	$ 57,982	$ (24,887)	$ 22,208