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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Schedule of Percent of Consolidated Revenue of Major Customers, Those Whose Total Represented 10% or More of Oil, Natural Gas and NGL Revenues The percent of consolidated revenue of major customers, those whose total represented 10% or more of the Company’s oil, natural gas and NGL revenues, was as follows:

 

 

Year Ended December 31,

 

 

 

2020

 

 

2019

 

 

2018

 

Shell Trading (US) Company

 

 

47

%

 

 

58

%

 

 

65

%

Phillips 66

 

 

22

%

 

 

28

%

 

 

18

%

Chevron Products Company

 

 

12

%

 

**

 

 

**

 

 

** Less than 10%