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, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Tax provision at statutory rate on income before income taxes $ 201,541 $ 167,156 $ 171,506
State income taxes, net of federal benefit 20,277 16,711 17,097
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount (104,864) 0 0
Other, net (4,896) (2,045) (3,276)
Total provision for income taxes $ 112,058 $ 181,822 $ 185,327