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Organization and Principal Activities (Tables)
12 Months Ended
Dec. 31, 2013
Organization and Principal Activities [Abstract]  
Schedule of Variable Interest Entities
   December 31, 
   2012   2013 
         
Cash and cash equivalents  $58,108   $116,575 
Restricted cash   1,605    2,068 
Account receivable and other current assets   34,976    61,177 
           
Total current assets   94,689    179,820 
           
Property and equipment, net   57,275    91,861 
Acquired intangible assets, net   5,113    9,681 
Other noncurrent assets   26,814    37,778 
           
Total noncurrent assets   89,202    139,320 
           
Total assets   183,891    319,140 
           
Deferred revenue, current   17,520    30,717 
Account payable and other current liabilities   51,455    106,894 
           
Total current liabilities   68,975    137,611 
Total noncurrent liabilities   3,613    2,235 
           
Total liabilities  $72,588   $139,846 

 

   Year ended December 31, 
   2011   2012   2013 
             
Revenues  $160,613   $303,200   $527,646 
Net income  $78,494   $150,408   $263,514 

 

   Year ended December 31, 
   2011   2012   2013 
             
Net cash provided by operating activities  $56,621   $75,983   $129,175 
Net cash used in investing activities   (32,367)   (50,951)   (72,678)
Net cash provided by financing activities   1,545    36    1,970 
                
   $25,799   $25,068   $58,467