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Income Taxes Components of current and deferred income tax expense (benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current provision (benefit)                      
Federal                 $ 8,760 $ 5,619 $ 5,725
State and other                 1,474 (13,968) (1,596)
Current Income Tax Expense (Benefit)                 10,234 (8,349) 4,129
Deferred provision (benefit)                      
Federal                 277,895 232,969 (1,833,580)
State and other                 33,804 (9,200) (262,843)
Deferred Income Tax Expense (Benefit)                 311,699 223,769 (2,096,423)
Income tax expense (benefit) $ 145,288 $ 71,507 $ 64,303 $ 40,834 $ 50,025 $ 84,383 $ 25,801 $ 55,210 $ 321,933 $ 215,420 $ (2,092,294)