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Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table summarizes our revenues by product type for the three months ended March 31, 2018 and 2017:
 
 
Three Months Ended
 
 
March 31,
In thousands
 
2018
 
2017
Oil sales
 
$
337,406

 
$
263,974

Natural gas sales
 
2,615

 
2,204

CO2 sales and transportation fees
 
7,552

 
5,388

Total revenues
 
$
347,573

 
$
271,566