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Revenue Recognition (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Oil
 
$
47,846

 
$
23,162

 
$
120,705

 
$
52,742

NGLs
 
6,795

 
1,831

 
12,939

 
4,820

Natural gas
 
4,096

 
1,890

 
9,637

 
5,072

Total operating revenues
 
$
58,737

 
$
26,883

 
$
143,281

 
$
62,634