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Additional Balance Sheet Details (Tables)
 6 Months Ended
Jun. 30, 2020
Table Text Block [Abstract]  
Trade and Other Receivables, Net
Trade and Other Receivables, Net
 
 
June 30,
 
December 31,
In thousands
 
2020
 
2019
Trade accounts receivable, net
 
$
12,790

 
$
12,630

Federal income tax receivable, net
 
10,457

 
2,987

Commodity derivative settlement receivables
 
9,037

 
675

Other receivables
 
2,165

 
2,026

Total
 
$
34,449

 
$
18,318