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Comprehensive Earnings
6 Months Ended
Jun. 30, 2011
Notes to Financial Statements [Abstract]  
Comprehensive Earnings
6.  
Comprehensive Earnings

Comprehensive earnings include net earnings and all other non-owner sources of changes in net assets and are as follows (in thousands):

   
Three months ended
June 30,
  
Six months ended
June 30,
 
   
2011
  
2010
  
2011
  
2010
 
Net earnings
 $106,311  $71,281  $195,290  $131,006 
Currency translation adjustments
  (7,761)  (17,017)  29,449   (48,268)
Comprehensive earnings
 $98,550  $54,264  $224,739  $82,738