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Income Taxes - Components of Income Tax Expense (Benefit) Table (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current income tax expense (benefit)      
Federal income tax expense (benefit) $ 32,422 $ (114) $ (62,149)
State income tax expense (benefit) 1,764 493 169
Total current income tax expense (benefit) 34,186 379 (61,980)
Deferred income tax expense (benefit)      
Federal income tax expense (benefit) 10,251 35,361 66,390
State income tax expense (benefit) 1,095 3,321 (144)
Total deferred income tax expense (benefit) [1] 11,346 38,682 66,246
Total income tax expense (benefit) [1] $ 45,532 $ 39,061 $ 4,266
[1] Financial information for the year ended December 31, 2015, has been recast to include the financial position and results attributable to the Springfield system, and the financial information for the years ended December 31, 2014 and 2013, has been recast to include the financial position and results attributable to the Springfield and DBJV systems. See Note 1 and Note 2.