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Income Taxes (Schedule Of Components Of Provision For Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]      
Current tax, U.S. Federal $ 98,208 $ 20,765 $ 244,470
Current tax, U.S. State 18,639 8,687 37,957
Current tax, Foreign 669 556 172
Current tax, Total 117,516 30,008 282,599
Deferred tax, U.S. Federal (16,201) (11,596) 11,000
Deferred tax, U.S. State (1,559) (2,546) 699
Deferred tax, Foreign (496) (2,470) (2,288)
Deferred tax, Total (18,256) (16,612) 9,411
Valuation allowance 230 2,405 2,255
Provision for income taxes $ 99,490 $ 15,801 $ 294,265