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Income Taxes - Deferred Tax Assets and Liabilities (Details) - Successor - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax liabilities    
Investments $ 171,517 $ 275,128
Total deferred tax liabilities 171,517 275,128
Deferred tax assets    
Property, plant and equipment 391,273 751,683
Derivative contracts 3,131 11,274
Allowance for doubtful accounts 986 1,487
Net operating loss carryforwards 217,259 527,079
Compensation and benefits 5,700 14,494
Tax Credits and other carryforwards 33,001 43,770
Asset retirement obligations 18,843 40,399
Other 2,273 4,663
Total deferred tax assets 672,466 1,394,849
Valuation allowance (500,949) (1,119,721)
Net deferred tax liability $ 0 $ 0