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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2012
Fair Value Measurements [Abstract]  
Fair value measurement of assets on a recurring basis
                         

in thousands

  Level 1  
 

March 31

2012

   

December 31

2011

    March 31
2011
 

Fair Value Recurring

                       

Rabbi Trust

                       

Mutual funds

        $14,591          $13,536          $13,594  

Equities

    8,641       7,057       10,144  

Total

    $23,232       $20,593       $23,738  

 

                         

in thousands

  Level 2  
 

March 31

2012

   

December 31

2011

   

March 31

2011

 

Fair Value Recurring

                       

Rabbi Trust

                       

Common/collective trust funds

            $455             $2,192            $1,323  

Total

    $455       $2,192       $1,323