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Debt (tables)
9 Months Ended
Sep. 30, 2013
Long-term Debt, Current and Noncurrent [Abstract]  
Fair Value Of Long Term Debt Table [Text Block]
 
 
September 30,
 
December 31,
In thousands
 
2013
 
2012
 
2012
Carrying amount
 
$
741,700

 
$
641,700

 
$
691,700

Estimated fair value
 
828,360

 
786,496

 
834,664