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Crude Oil and Natural Gas Property Information - Schedule of Results of Operations from Crude Oil and Natural Gas Producing Activities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Oil and Gas Exploration and Production Industries Disclosures [Abstract]      
Crude oil and natural gas sales $ 2,982,966 $ 2,026,958 $ 2,552,531
Production expenses (324,214) (289,289) (348,897)
Production taxes (208,278) (142,388) (200,637)
Exploration Expense (12,393) (16,972) (19,413)
Depreciation, depletion, amortization and accretion (1,652,180) (1,679,485) (1,722,336)
Property impairments (237,370) (237,292) (402,131)
Income tax benefit (1) 504,475 [1] 126,794 33,680
Results from crude oil and natural gas producing activities $ 1,053,006 $ (211,674) $ (107,203)
[1] Income taxes reflect the application of a combined federal and state tax rate of 38% on pre-tax income and losses generated by operations in the United States. Additionally, the 2017 period includes a $713.7 million income tax benefit recognized upon the Company’s remeasurement of its deferred income tax assets and liabilities in response to the enactment of the Tax Reform Act in December 2017. See Note 8. Income Taxes for further discussion.