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Revenue Recognition (Tables)
 6 Months Ended
Jun. 30, 2018
Disaggregation of Revenue [Abstract]  
Summary of Operating Revenues are Comprised of Sales of Crude Oil, NGLs and Natural Gas
Operating revenues are comprised of sales of crude oil, NGLs and natural gas.
In thousands
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Oil
 
$
39,707

 
$
15,090

 
$
72,859

 
$
29,580

NGLs
 
4,410

 
1,319

 
6,143

 
2,989

Natural gas
 
3,735

 
1,726

 
5,542

 
3,182

Total operating revenues
 
$
47,852

 
$
18,135

 
$
84,544

 
$
35,751