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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value of Financial Instruments [Abstract]  
Carrying value and fair value of long-term debt
                                 
    March 31, 2013     December 31, 2012  
In thousands   Carrying
Value
    Fair
Value
    Carrying
Value
    Fair
Value
 

Fixed-rate bonds

  $ 250,000     $ 263,750     $ 250,000     $ 260,340  

Variable rate debt

    —         —         —         —    
   

 

 

   

 

 

   

 

 

   

 

 

 

Total

  $ 250,000     $ 263,750     $ 250,000     $ 260,340