v2.4.0.6
Income Taxes Components of Income Tax Provision (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Components of Income Tax Provision [Line Items]      
Current federal tax expense (benefit) $ 0 $ 0 $ (1,191)
Current state tax expense (benefit) 3,729 3,401 (22,135)
Current income tax expense (benefit) 3,729 3,401 (23,326)
Deferred federal income tax expense (benefit) 162,695 105,090 95,377
Deferred state income tax expense (benefit) 11,922 10,388 14,784
Deferred income tax expense (benefit) 174,617 115,478 110,161
Provision for income taxes $ 178,346 $ 118,879 $ 86,835