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, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]      
Tax provision at statutory rate on income before income taxes $ 95,584 $ 77,029 $ 43,549
State income taxes, net of federal benefit 10,211 7,480 5,002
Meals and entertainment disallowance 828 721 616
Tax credits (2,609) (4,453) (744)
Other, net (368) (163) 352
Total provision for income taxes $ 103,646 $ 80,614 $ 48,775