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, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Tax provision at statutory rate on income before income taxes $ 171,506 $ 151,380 $ 115,040
State income taxes, net of federal benefit 17,097 14,120 12,083
Meals and entertainment disallowance 1,035 959 872
Tax credits (3,036) (1,307) (5,422)
Other, net (1,275) (152) 0
Total provision for income taxes $ 185,327 $ 165,000 $ 122,573