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INVESTMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 12, 2016
Dec. 11, 2015
May 26, 2015
Aug. 07, 2014
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Oct. 23, 2017
Dec. 31, 2016
Investments                    
Weighted average life of all fixed income investments, excluding the Company's investment in Ctrip convertible debt securities             1 year 7 months      
Marketable Securities, Realized Gain (Loss)         $ 300 $ 900 $ 500 $ 100    
Cost Method Investments         8,200   8,200     $ 7,600
Impairment of cost-method investment         0 $ 0 0 $ 63,208    
Ctrip.com International, Ltd.                    
Investments                    
Debt Investment, Term 6 years 10 years 5 years 5 years            
Maximum Ownership Percentage in Ctrip     15.00%              
Short-term Investments                    
Investments                    
Cost         4,407,645   4,407,645     2,218,640
Gross Unrealized Gains         1,778   1,778     1,397
Gross Unrealized Losses         (2,395)   (2,395)     (1,157)
Fair Value         4,407,028   4,407,028     2,218,880
Short-term Investments | International government securities                    
Investments                    
Cost         690,728   690,728     249,552
Gross Unrealized Gains         684   684     221
Gross Unrealized Losses         (270)   (270)     (89)
Fair Value         691,142   691,142     249,684
Short-term Investments | U.S. government securities                    
Investments                    
Cost         844,214   844,214     456,971
Gross Unrealized Gains         42   42     57
Gross Unrealized Losses         (596)   (596)     (140)
Fair Value         843,660   843,660     456,888
Short-term Investments | Corporate debt securities                    
Investments                    
Cost         2,818,705   2,818,705     1,510,119
Gross Unrealized Gains         1,052   1,052     1,119
Gross Unrealized Losses         (1,529)   (1,529)     (928)
Fair Value         2,818,228   2,818,228     1,510,310
Short-term Investments | Commercial paper                    
Investments                    
Cost         53,998   53,998     1,998
Gross Unrealized Gains         0   0     0
Gross Unrealized Losses         0   0     0
Fair Value         53,998   53,998     1,998
Long-term Investments                    
Investments                    
Cost         10,401,379   10,401,379     9,407,136
Gross Unrealized Gains         741,965   741,965     293,453
Gross Unrealized Losses         (29,030)   (29,030)     (109,522)
Fair Value         11,114,314   11,114,314     9,591,067
Long-term Investments | International government securities                    
Investments                    
Cost         591,294   591,294     655,857
Gross Unrealized Gains         2,451   2,451     4,110
Gross Unrealized Losses         (237)   (237)     (623)
Fair Value         593,508   593,508     659,344
Long-term Investments | U.S. government securities                    
Investments                    
Cost         1,010,179   1,010,179     773,718
Gross Unrealized Gains         102   102     337
Gross Unrealized Losses         (6,495)   (6,495)     (7,463)
Fair Value         1,003,786   1,003,786     766,592
Long-term Investments | Corporate debt securities                    
Investments                    
Cost         6,864,642   6,864,642     6,042,271
Gross Unrealized Gains         16,184   16,184     9,973
Gross Unrealized Losses         (22,272)   (22,272)     (50,455)
Fair Value         6,858,554   6,858,554     6,001,789
Long-term Investments | U.S. government agency securities                    
Investments                    
Cost         4,953   4,953     4,979
Gross Unrealized Gains         0   0     0
Gross Unrealized Losses         (26)   (26)     (27)
Fair Value         4,927   4,927     4,952
Long-term Investments | Ctrip convertible debt securities | Ctrip.com International, Ltd.                    
Investments                    
Cost $ 25,000 $ 500,000 $ 250,000 $ 500,000 1,275,000   1,275,000     1,275,000
Gross Unrealized Gains         237,638   237,638     65,800
Gross Unrealized Losses         0   0     (47,712)
Fair Value         1,512,638   1,512,638     1,293,088
Long-term Investments | Ctrip equity securities | Ctrip.com International, Ltd.                    
Investments                    
Cost         655,311   655,311     655,311
Gross Unrealized Gains         485,590   485,590     213,233
Gross Unrealized Losses         0   0     (3,242)
Fair Value         $ 1,140,901   $ 1,140,901     $ 865,302
Subsequent Event [Member] | Meituan-Dianping [Member]                    
Investments                    
Cost Method Investments                 $ 450,000