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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2011
Fair Value Measurements [Abstract]  
Fair value measurement of assets and liabilities on a recurring basis
                         
 
                 
            Level 1        
    June 30     December 31     June 30  
in thousands   2011     2010     2010  
 
                 
Fair Value Recurring
                       
Rabbi Trust
                       
Mutual funds
    $14,836       $13,960       $10,787  
Equities
    8,413       9,336       7,236  
 
                 
Total asset
    $23,249       $23,296       $18,023  
 
                 
                         
 
                       
    Level 2
    June 30   December 31     June 30  
in thousands   2011     2010     2010  
 
                       
Fair Value Recurring
                       
Medium-term investments
    $0       $0       $3,910  
Interest rate swaps
    (7,419 )     0       (5,614 )
Rabbi Trust
                       
Common/collective trust funds
    1,368       2,431       3,185  
 
                       
Net asset (liability)
    ($6,051 )     $2,431       $1,481  
 
                       
Fair value measurement of assets on a nonrecurring basis
                 
 
               
    As of December 31, 2010  
            Impairment  
in thousands   Level 3     Charges  
 
Fair Value Nonrecurring
               
Property, plant & equipment
    $1,536       $2,500  
Assets held for sale
    9,625       1,436  
 
Totals
    $11,161       $3,936