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Income Taxes (Schedule Of Components Of Provision For Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Abstract]      
Current tax, U.S. Federal $ 20,765 $ 244,470 $ 248,219
Current tax, U.S. State 8,687 37,957 41,225
Current tax, Foreign 556 172 156
Current tax, Total 30,008 282,599 289,600
Deferred tax, U.S. Federal (11,596) 11,000 (13,890)
Deferred tax, U.S. State (2,546) 699 (6,740)
Deferred tax, Foreign (2,470) (2,288) (3,075)
Deferred tax, Total (16,612) 9,411 (23,705)
Valuation allowance 2,405 2,255 3,034
Provision for income taxes $ 15,801 $ 294,265 $ 268,929