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Income Taxes (Components Of Income Tax Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Federal - Deferred $ 42,809 $ 38,153  
State - Deferred 3,980 4,809  
Income tax expense (benefit) - Deferred 46,789 42,962  
Total income tax expense $ 46,789 $ 42,962