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Comprehensive Income
6 Months Ended
Jun. 30, 2011
Comprehensive Income [Abstract]  
Comprehensive Income
14.
Comprehensive Income

Comprehensive income encompasses all changes in equity other than those arising from transactions with stockholders, and consists of net income, currency translation adjustments, pension adjustments and unrealized net gains and losses on investments classified as available-for-sale. Comprehensive income is net income adjusted for changes in unrealized gains and losses on marketable securities and foreign currency translation.

Comprehensive income was (in thousands):
 
   
Three Months Ended June 30,
  
Six Months Ended June 30, 
 
   
2011
  
2010
  
2011
  
2010
 
Net income
 $19,131  $6,563  $42,726  $11,553 
Foreign currency translation
  5,684   (15,617)  16,620   (25,775)
Unrealized gain (loss) on investments
  (116)  (857)  5   (36)
Comprehensive income (loss)
 $24,699  $(9,911) $59,351  $(14,258)