XML 51 R34.htm IDEA: XBRL DOCUMENT v3.10.0.1
Additional Balance Sheet Details (Tables)
 12 Months Ended
Dec. 31, 2018
Text Block [Abstract]  
Trade and Other Receivables, Net
Trade and Other Receivables, Net
 
 
December 31,
In thousands
 
2018
 
2017
Trade accounts receivable, net
 
$
11,643

 
$
15,926

Federal income tax receivable, net
 
9,037

 
8,262

Commodity derivative settlement receivables
 
2,390

 
—

Other receivables
 
3,900

 
21,005

Total
 
$
26,970

 
$
45,193