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Debt (tables)
3 Months Ended
Mar. 31, 2015
Long-term Debt, Current and Noncurrent [Abstract]  
Fair Value Of Long Term Debt Table [Text Block]
 
 
March 31,
 
December 31,
In thousands
 
2015
 
2014
 
2014
Carrying amount
 
$
661,700

 
$
741,700

 
$
661,700

Estimated fair value
 
762,554

 
820,458

 
756,808