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Income Taxes (Components Of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current      
Federal $ 223,837 $ 256,748 $ 250,527
State 28,231 31,297 30,768
Foreign 12,634 13,677 10,518
Income tax expense 264,702 301,722 291,813
Deferred      
Federal 23,149 7,362 1,919
State 1,236 227 256
Foreign 1,164 348 (704)
Income tax expense 25,549 7,937 1,471
Total      
Federal 246,986 264,110 252,446
State 29,467 31,524 31,024
Foreign 13,798 14,025 9,814
Income tax expense $ 290,251 $ 309,659 $ 293,284