Basis of Presentation and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Concentration Risk, Percentage of Sales
The table below presents percentages by purchaser that accounted for 10% or more of our total net revenues for each year as presented:
 
For the Year Ended December 31,
 
2018
 
2017
 
2016
Shell Trading (US) Company
19
%
 
33
%
 
22
%
BP America
18
%
 
16
%
 
—
%
Eagleclaw Midstream Ventures, LLC
12
%
 
14
%
 
—
%
Plains Marketing, LP
—
%
 
2
%
 
48
%
Permian Transport and Trading
—
%
 
7
%
 
11
%