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Debt (Tables)
 3 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]  
Fair Value Of Long Term Debt Table [Text Block]
 
 
March 31,
 
December 31,
In thousands
 
2017
 
2016
 
2016
Gross long-term debt
 
$
726,700

 
$
601,700

 
$
726,700

Unamortized debt issuance costs
 
(6,990
)
 
(6,975
)
 
(7,377
)
Carrying amount
 
$
719,710

 
$
594,725

 
$
719,323

Estimated fair value(1)
 
785,980

 
686,159

 
793,339