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Income Taxes (Difference In Income Tax Expense And Expected Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Federal income tax expense at the 'expected' rate of 35% $ 276,405 $ 289,107 $ 275,602
State income taxes, net of federal benefit 20,038 21,613 20,549
Other, net (6,192) (1,061) (2,867)
Income tax expense $ 290,251 $ 309,659 $ 293,284
Expected rate of federal income tax expense 35.00% 35.00% 35.00%
Effective income tax rate 36.80% 37.50% 37.20%