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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, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Investments                      
Weighted maturity of investments                 2 years    
Marketable Securities, Realized Gain (Loss)         $ 900     $ (300) $ 100 $ 3,100  
Cost Method Investments         600       600   $ 62,300
Cost-method Investments, Other than Temporary Impairment         0     $ 0 63,208 $ 0  
Ctrip.com International, Ltd. [Member]                      
Investments                      
Debt Investment, Term 6 years 10 years 5 years 5 years              
Maximum Ownership Percentage in Ctrip     15.00%                
Hotel Urbano [Member]                      
Investments                      
Cost-method Investments, Other than Temporary Impairment           $ 10,000 $ 50,000        
Other Cost Method Investments [Member]                      
Investments                      
Cost-method Investments, Other than Temporary Impairment           $ 3,000          
Short-term Investments [Member]                      
Investments                      
Cost         1,955,057       1,955,057   1,171,756
Gross Unrealized Gains         1,339       1,339   522
Gross Unrealized Losses         (349)       (349)   (1,032)
Fair Value         1,956,047       1,956,047   1,171,246
Short-term Investments [Member] | Foreign government securities                      
Investments                      
Cost         327,812       327,812   395,404
Gross Unrealized Gains         112       112   497
Gross Unrealized Losses         (80)       (80)   (104)
Fair Value         327,844       327,844   395,797
Short-term Investments [Member] | U.S. government securities                      
Investments                      
Cost         365,437       365,437   457,001
Gross Unrealized Gains         99       99   0
Gross Unrealized Losses         (36)       (36)   (507)
Fair Value         365,500       365,500   456,494
Short-term Investments [Member] | Corporate debt securities                      
Investments                      
Cost         1,251,523       1,251,523   305,654
Gross Unrealized Gains         1,127       1,127   25
Gross Unrealized Losses         (232)       (232)   (419)
Fair Value         1,252,418       1,252,418   305,260
Short-term Investments [Member] | Commercial paper                      
Investments                      
Cost                     11,688
Gross Unrealized Gains                     0
Gross Unrealized Losses                     0
Fair Value                     11,688
Short-term Investments [Member] | U.S. government agency securities                      
Investments                      
Cost         10,285       10,285   2,009
Gross Unrealized Gains         1       1   0
Gross Unrealized Losses         (1)       (1)   (2)
Fair Value         10,285       10,285   2,007
Long-term Investments [Member]                      
Investments                      
Cost         8,767,384       8,767,384   7,474,775
Gross Unrealized Gains         546,698       546,698   508,244
Gross Unrealized Losses         (17,665)       (17,665)   (51,656)
Fair Value         9,296,417       9,296,417   7,931,363
Long-term Investments [Member] | Foreign government securities                      
Investments                      
Cost         614,328       614,328   718,947
Gross Unrealized Gains         4,405       4,405   1,367
Gross Unrealized Losses         (97)       (97)   (683)
Fair Value         618,636       618,636   719,631
Long-term Investments [Member] | U.S. government securities                      
Investments                      
Cost         717,041       717,041   580,155
Gross Unrealized Gains         3,481       3,481   277
Gross Unrealized Losses         (194)       (194)   (1,982)
Fair Value         720,328       720,328   578,450
Long-term Investments [Member] | Corporate debt securities                      
Investments                      
Cost         5,496,709       5,496,709   4,294,282
Gross Unrealized Gains         39,567       39,567   1,273
Gross Unrealized Losses         (3,924)       (3,924)   (18,941)
Fair Value         5,532,352       5,532,352   4,276,614
Long-term Investments [Member] | U.S. government agency securities                      
Investments                      
Cost         8,995       8,995    
Gross Unrealized Gains         1       1    
Gross Unrealized Losses         0       0    
Fair Value         8,996       8,996    
Long-term Investments [Member] | U.S. municipal securities                      
Investments                      
Cost                     1,080
Gross Unrealized Gains                     3
Gross Unrealized Losses                     0
Fair Value                     1,083
Long-term Investments [Member] | Ctrip convertible debt securities | Ctrip.com International, Ltd. [Member]                      
Investments                      
Cost $ 25,000 $ 500,000 $ 250,000 $ 500,000 1,275,000       1,275,000   1,250,000
Gross Unrealized Gains         147,127       147,127   158,600
Gross Unrealized Losses         (13,450)       (13,450)   (30,050)
Fair Value         1,408,677       1,408,677   1,378,550
Long-term Investments [Member] | Ctrip equity securities | Ctrip.com International, Ltd. [Member]                      
Investments                      
Cost         655,311       655,311   630,311
Gross Unrealized Gains         352,117       352,117   346,724
Gross Unrealized Losses         0       0   0
Fair Value         1,007,428       1,007,428   $ 977,035
American Depositary Shares [Member] | Long-term Investments [Member] | Ctrip equity securities | Ctrip.com International, Ltd. [Member]                      
Investments                      
Cost         630,300       630,300    
Ordinary Shares [Member] | Long-term Investments [Member] | Ctrip equity securities | Ctrip.com International, Ltd. [Member]                      
Investments                      
Cost         $ 25,000       $ 25,000