Income Taxes (Components Of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal
Current	$ 14,190	$ 10,898	$ 17,444
Deferred	(39,244)	10,934	(21,947)
Total	(25,054)	21,832	(4,503)
State
Current	1,982	955	2,239
Deferred	(1,815)	(579)	(56)
Total	167	376	2,183
Current	16,172	11,853	19,683
Deferred	(41,059)	10,355	(22,003)
Income tax (benefit) expense	$ (24,887)	$ 22,208	$ (2,320)