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Income Taxes, Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income tax expense (benefit)      
Current federal income tax expense (benefit) $ 92,887 $ (87,736) $ 181,579
Current state income tax expense 8,256 11,091 11,614
Deferred federal income tax expense (benefit) 60,939 41,851 (65,970)
Federal - valuation allowance adjustment   (10,816)  
Deferred state income tax expense (benefit) 9,910 2,208 (1,180)
State - valuation allowance adjustment   38,470  
Total income tax expense (benefit) $ 171,992 $ (4,932) $ 126,043