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Investments (Tables)
12 Months Ended
Dec. 31, 2011
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
The Company's investments (other than pension assets) consist of the following (in thousands):
 
   
Amortized
Cost
  
Gross
Unrealized
Gains
  
Gross
Unrealized
Losses
  
Fair Value
(Net Carrying
Amount)
 
December 31, 2011
            
Trading equity securities
 $3,160  $81  $79  $3,162 
Trading debt securities
  7,761   211   71   7,901 
Total
 $10,921  $292  $150  $11,063 
December 31, 2010
                
Trading equity securities
 $3,089  $154  $7  $3,236 
Trading debt securities
  9,393   266   67   9,592 
Total
 $12,482  $420  $74  $12,828