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Debt (Tables)
 9 Months Ended
Sep. 30, 2016
Long-term Debt, Current and Noncurrent [Abstract]  
Fair Value Of Long Term Debt Table [Text Block]
 
 
September 30,
 
December 31,
In thousands
 
2016
 
2015
 
2015
Gross long-term debt
 
$
601,700

 
$
621,700

 
$
601,700

Unamortized debt issuance costs
 
(6,487
)
 
(7,647
)
 
(7,282
)
Carrying amount
 
$
595,213

 
$
614,053

 
$
594,418

Estimated fair value(1)
 
701,183

 
697,647

 
667,168