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Additional Balance Sheet Details (Tables)
 6 Months Ended
Jun. 30, 2017
Table Text Block [Abstract]  
Trade and Other Receivables, Net
Trade and Other Receivables, Net
 
 
June 30,
 
December 31,
In thousands
 
2017
 
2016
Trade accounts receivable, net
 
$
17,211

 
$
20,084

Federal income tax receivable
 
11,271

 
—

Other receivables
 
31,911

 
23,816

Total
 
$
60,393

 
$
43,900