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Income Taxes, Expense (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income tax expense      
Current federal income tax expense $ (90,235) $ 19,290 $ 69,942
Current state income tax expense 1,049 (11,059) 648
Deferred federal income tax expense 187,581 57,759 41,884
Deferred state income tax expense 15,683 15,968 5,376
Total income tax expense $ 114,078 $ 81,958 $ 117,850