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Income Taxes (Schedule Of Components Of Benefit/(Provision) For Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Abstract]      
Current tax, U.S. Federal $ 204,063 $ (57,020) $ (58,878)
Current tax, U.S. State (32,684) (20,499) (21,780)
Current tax, Foreign (1,044) (646) (637)
Current tax, Total 170,335 (78,165) (81,295)
Deferred tax, U.S. Federal (120,066) (27,231) (10,541)
Deferred tax, U.S. State 11,507 (2,740) (479)
Deferred tax, Foreign 7,158 2,685 2,261
Deferred tax, Total (101,401) (27,286) (8,759)
Valuation allowance (6,949) (2,676) (1,829)
Benefit/(provision) for income taxes $ 61,985 $ (108,127) $ (91,883)