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Income Taxes Components of current and deferred income tax expense (benefit) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current provision (benefit)                      
Federal                 $ (8,523) $ (71,796) $ (114,617)
State and other                 (14,068) (28,116) (23,200)
Current Income Tax Expense (Benefit)                 (22,591) (99,912) (137,817)
Deferred provision (benefit)                      
Federal                 0 0 0
State and other                 0 0 0
Deferred Income Tax Expense (Benefit)                 0 0 0
Income tax expense (benefit) $ (7,529) $ (10,727) $ (2,510) $ (1,825) $ (22,896) $ (73,202) $ 2,052 $ (5,866) $ (22,591) [1] $ (99,912) [1] $ (137,817)
[1] Due to rounding, the sum of quarterly results may not equal the total for the year. Additionally, quarterly and year-to-date computations of per share amounts are made independently.