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Additional Balance Sheet Details (Tables)
 12 Months Ended
Dec. 31, 2019
Text Block [Abstract]  
Trade and Other Receivables, Net
Trade and Other Receivables, Net
 
 
December 31,
In thousands
 
2019
 
2018
Trade accounts receivable, net
 
$
12,630

 
$
11,643

Federal income tax receivable, net
 
2,987

 
9,037

Commodity derivative settlement receivables
 
675

 
2,390

Other receivables
 
2,026

 
3,900

Total
 
$
18,318

 
$
26,970