Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Divestitures - Additional Information (Details)

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Acquisitions and Divestitures - Additional Information (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 28, 2018
Apr. 05, 2018
Sep. 30, 2018
Business Acquisition [Line Items]      
Asset retirement obligations recognized     $ 3,597
Heidelberg Field Acquisition      
Business Acquisition [Line Items]      
Gross purchase price   $ 31,100  
Net purchase price   16,800  
Letters of credit outstanding   9,400  
Asset retirement obligations recognized   $ 3,600  
Purchase obligations due, year   2028  
Purchase commitment   $ 19,600  
Permian Basin      
Business Acquisition [Line Items]      
Net proceeds received from divestiture $ 50,500    
Period following date allowed as condition for curing title defects to receive additional proceeds     90 days
Permian Basin | Maximum      
Business Acquisition [Line Items]      
Additional proceeds expected to receive from divestiture     $ 6,400
Cobalt International Energy, Inc | Heidelberg Field Acquisition      
Business Acquisition [Line Items]      
Percentage of non-operated working interest acquired   9.375%