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Oil and Natural Gas Properties - Pivotal Farmout (Details) - Farmout Agreement
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 21, 2017
well
Nov. 30, 2017
Sep. 30, 2020
well
Dec. 31, 2020
USD ($)
well
Dec. 31, 2019
USD ($)
Angelina County, Texas          
Business Acquisition [Line Items]          
Exploratory wells, expected to be drilled       37  
Pivotal | San Augustine County, Texas          
Business Acquisition [Line Items]          
Exploratory wells, expected to be drilled 80   4    
Number of wells       68  
Exploratory wells, expected to be drilled per year     15    
Asset acquisition, ownership interest, in wells operated by others, percent   100.00%      
Revenue of acquiree since acquisition date, actual | $       $ 119.2  
Pivotal | San Augustine County, Texas | Minimum          
Business Acquisition [Line Items]          
Asset acquisition, ownership interest, in wells operated by others, gross, percent   12.50%      
Pivotal | San Augustine County, Texas | Maximum          
Business Acquisition [Line Items]          
Asset acquisition, ownership interest, in wells operated by others, gross, percent   25.00%      
Second Pivotal Farmout | San Augustine County, Texas          
Business Acquisition [Line Items]          
Number of wells       2  
Canaan Resource Partners | Angelina County, Texas          
Business Acquisition [Line Items]          
Revenue of acquiree since acquisition date, actual | $       $ 90.2  
Canaan Resource Partners | Angelina County, Texas | Commodity derivative liabilities          
Business Acquisition [Line Items]          
Working interests in wells drilled and completed, actual | $       $ 0.1 $ 1.7