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Income Taxes Income Taxes (Schedule of Components of 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:                      
State                 $ (1,069) $ 14,384 $ 6,860
Federal                 (439) 16,039 6,325
Deferred:                      
State                 (14,218) 4,314 7,385
Federal                 (240,275) 118,604 77,566
Total income tax (benefit) expense provision $ (36,663) $ (216,603) $ (17,214) $ 14,479 $ 67,757 $ 4,876 $ 31,461 $ 49,247 $ (256,001) $ 153,341 $ 98,136