Annual report pursuant to Section 13 and 15(d)

Income Taxes (Schedule Of Effective Reconciliation Of The U.S. Statutory Federal Income Tax Rates) (Details)

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Income Taxes (Schedule Of Effective Reconciliation Of The U.S. Statutory Federal Income Tax Rates) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Tax provision at statutory rate on income before income taxes $ 167,156 $ 171,506 $ 151,380
State income taxes, net of federal benefit 16,711 17,097 14,120
Meals and entertainment disallowance 964 1,035 959
Tax credits (2,408) (3,036) (1,307)
Other, net (601) (1,275) (152)
Total provision for income taxes $ 181,822 $ 185,327 $ 165,000