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Comprehensive Income
3 Months Ended
Mar. 31, 2012
Comprehensive Income [Abstract]  
Comprehensive Income
12. Accumulated Comprehensive Income

Accumulated other comprehensive income (loss) in the consolidated balance sheet consists of the following (in thousands of dollars):

      
Defined
  
Defined
  
Accumulated
 
   
Foreign
  
Benefit
  
Benefit
  
Other
 
   
Currency
  
Pension
  
Postretirement
  
Comprehensive
 
   
Translation
  
Plans
  
Plans
  
Loss
 
              
Balance, Dec. 31, 2011
 $1,761  $(81,813) $1,116  $(78,936)
Current-period change
  10,352   1,537   (20)  11,869 
                 
Balance, March 31, 2012
 $12,113  $(80,276) $1,096  $(67,067)