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Revenue Recognition (Tables)
 6 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table summarizes our revenues by product type for the three and six months ended June 30, 2018 and 2017:
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
In thousands
 
2018
 
2017
 
2018
 
2017
Oil sales
 
$
373,286

 
$
248,317

 
$
710,692

 
$
512,291

Natural gas sales
 
2,279

 
2,563

 
4,894

 
4,767

CO2 sales and transportation fees
 
6,715

 
6,555

 
14,267

 
11,943

Total revenues
 
$
382,280

 
$
257,435

 
$
729,853

 
$
529,001