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Income Taxes (Schedule Of Components Of Provision For Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Abstract]      
Current tax, U.S. Federal $ 244,470 $ 248,219 $ 165,731
Current tax, U.S. State 37,957 41,225 39,136
Current tax, Foreign 172 156 63
Current tax, Total 282,599 289,600 204,930
Deferred tax, U.S. Federal 11,000 (13,890) 5,238
Deferred tax, U.S. State 699 (6,740) (3,105)
Deferred tax, Foreign (2,288) (3,075) (1,330)
Deferred tax, Total 9,411 (23,705) 803
Valuation allowance 2,255 3,034 1,300
Provision for income taxes $ 294,265 $ 268,929 $ 207,033