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, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Tax provision at statutory rate on income before income taxes $ 77,029 $ 43,549 $ 20,008
State income taxes, net of federal benefit 7,480 5,002 2,359
Meals and entertainment disallowance 721 616 521
Tax credits (4,453) (744) (783)
Other, net (163) 352 189
Total provision for income taxes $ 80,614 $ 48,775 $ 22,294