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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value of Financial Instruments [Abstract]  
Carrying value and fair value of long-term debt
                                 
    2012     2011  

In thousands

   
 
Carrying
Value
  
  
    Fair Value      
 
Carrying
Value
  
  
   
 
Fair
Value
  
  

Fixed-rate bonds

  $ 250,000     $ 260,340     $ 200,000     $ 204,000  

Variable rate debt

                27,000       27,000  

Total

  $ 250,000     $ 260,340     $ 227,000     $ 231,000