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Revenue Recognition (Tables)
 9 Months Ended
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table summarizes our revenues by product type for the three and nine months ended September 30, 2018 and 2017:
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
In thousands
 
2018
 
2017
 
2018
 
2017
Oil sales
 
$
377,329

 
$
256,621

 
$
1,088,021

 
$
768,912

Natural gas sales
 
2,299

 
2,409

 
7,193

 
7,176

CO2 sales and transportation fees
 
8,149

 
6,590

 
22,416

 
18,533

Total revenues
 
$
387,777

 
$
265,620

 
$
1,117,630

 
$
794,621