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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2012
Fair Value of Financial Instruments [Abstract]  
Carrying value and fair value of long-term debt
                                 
    September 30, 2012     December 31, 2011  

In thousands

  Carrying
Value
    Fair Value     Carrying
Value
    Fair Value  

Fixed-rate bonds

  $ 200,000     $ 204,750     $ 200,000     $ 204,000  

Variable rate debt

    19,000       19,000       27,000       27,000  
   

 

 

   

 

 

   

 

 

   

 

 

 

Total

  $ 219,000     $ 223,750     $ 227,000     $ 231,000