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Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table summarizes our revenues by product type for the years ended December 31, 2019, 2018 and 2017:
 
 
Year Ended December 31,
In thousands
 
2019
 
2018
 
2017
Oil sales
 
$
1,205,083

 
$
1,412,358

 
$
1,079,703

Natural gas sales
 
6,937

 
10,231

 
9,963

CO2 sales and transportation fees
 
34,142

 
31,145

 
26,182

Purchased oil sales
 
14,198

 
1,921

 
3,718

Total revenues
 
$
1,260,360

 
$
1,455,655

 
$
1,119,566