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Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019 and 2018:
 
 
Three Months Ended
 
 
March 31,
In thousands
 
2019
 
2018
Oil sales
 
$
291,965

 
$
337,406

Natural gas sales
 
2,612

 
2,615

CO2 sales and transportation fees
 
8,570

 
7,552

Total revenues
 
$
303,147

 
$
347,573