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Comprehensive Income
6 Months Ended
Jun. 30, 2011
Comprehensive Income [Abstract]  
Comprehensive Income
9. Comprehensive Income
     The following table presents the components of comprehensive income for the periods presented (in thousands):
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
Net income
  $ 15,204     $ 7,604     $ 27,362     $ 13,843  
Foreign currency translation gain (loss)
    867       (4,573 )     5,245       (6,075 )
Unrealized loss on available-for-sale securities
                21       (4 )
 
                       
Comprehensive income
  $ 16,071     $ 3,031     $ 32,628     $ 7,764