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Debt (Tables)
6 Months Ended
Jun. 30, 2015
Long-term Debt, Current and Noncurrent [Abstract]  
Fair Value Of Long Term Debt Table [Text Block]
 
 
June 30,
 
December 31,
In thousands
 
2015
 
2014
 
2014
Carrying amount
 
$
621,700

 
$
721,700

 
$
661,700

Estimated fair value
 
695,902

 
807,617

 
756,808