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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Components of the provision for income taxes        
Federal $ 0 $ 0 $ 0 $ 0
State (8,308) 479 2,092 1,480
Deferred portion of income tax expense (benefit) 4,168 124,269 (80,388) 198,180
Total income tax expense (benefit) $ (4,140) $ 124,748 $ (78,296) $ 199,660
Effective tax rate 403.50% 37.40% 42.20% 37.40%