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Income Taxes Income Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current:      
U.S. Federal $ (51,243) $ (130,003) $ (31,791)
U.S. State (113) 0 (1,838)
Current income tax (benefit) (51,356) (130,003) (33,629)
Deferred:      
U.S. Federal 47,717 319,813 (166,112)
U.S. State 31,375 25,747 23,283
Deferred income tax (benefit) 79,092 345,560 (142,829)
Income Tax Expense (Benefit) / Effective Rate $ 27,736 $ 215,557 $ (176,458)