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Organization and Principal Activities (Tables)
12 Months Ended
Dec. 31, 2014
Organization and Principal Activities [Abstract]  
Schedule of Variable Interest Entities
   December 31, 
   2013   2014 
         
Cash and cash equivalents  $116,575   $239,903 
Restricted cash   2,068    2,053 
Accounts receivable and other current assets   61,177    242,388 
           
Total current assets   179,820    484,344 
           
Property and equipment, net   91,861    138,345 
Acquired intangible assets, net   9,681    32,292 
Other noncurrent assets   37,778    301,070 
           
Total noncurrent assets   139,320    471,707 
           
Total assets   319,140    956,051 
           
Deferred revenue-current   30,717    44,869 
Accounts payable and other current liabilities   106,894    322,968 
           
Total current liabilities   137,611    367,837 
Total noncurrent liabilities   2,235    9,611 
           
Total liabilities  $139,846   $377,448 

 

   Year ended December 31, 
   2012   2013   2014 
             
Revenues  $303,200   $527,646   $1,069,308 
Net income  $150,408   $263,514   $451,191 

 

   Year ended December 31, 
   2012   2013   2014 
             
Net cash provided by operating activities  $75,983   $129,175   $439,351 
Net cash used in investing activities   (50,951)   (72,678)   (305,996)
Net cash provided by (used in) financing activities   36    1,970    (10,028)
                
   $25,068   $58,467   $123,327