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INVESTMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 11, 2015
May 26, 2015
Aug. 07, 2014
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Investments                  
Weighted maturity of investments             1 year 10 months    
Marketable Securities, Realized Gain (Loss)       $ 2,100   $ 1,600 $ (800) $ 3,400  
Cost Method Investments       600     600   $ 62,300
Cost-method Investments, Other than Temporary Impairment       12,858   $ 0 63,208 $ 0  
Ctrip.com International, Ltd. [Member]                  
Investments                  
Debt Investment, Term 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       1,675,868     1,675,868   1,171,756
Gross Unrealized Gains       1,671     1,671   522
Gross Unrealized Losses       (297)     (297)   (1,032)
Fair Value       1,677,242     1,677,242   1,171,246
Short-term Investments [Member] | Foreign government securities                  
Investments                  
Cost       287,229     287,229   395,404
Gross Unrealized Gains       94     94   497
Gross Unrealized Losses       (211)     (211)   (104)
Fair Value       287,112     287,112   395,797
Short-term Investments [Member] | U.S. government securities                  
Investments                  
Cost       427,344     427,344   457,001
Gross Unrealized Gains       194     194   0
Gross Unrealized Losses       (3)     (3)   (507)
Fair Value       427,535     427,535   456,494
Short-term Investments [Member] | Corporate debt securities                  
Investments                  
Cost       949,907     949,907   305,654
Gross Unrealized Gains       1,382     1,382   25
Gross Unrealized Losses       (78)     (78)   (419)
Fair Value       951,211     951,211   305,260
Short-term Investments [Member] | Commercial paper                  
Investments                  
Cost       8,012     8,012   11,688
Gross Unrealized Gains       0     0   0
Gross Unrealized Losses       (5)     (5)   0
Fair Value       8,007     8,007   11,688
Short-term Investments [Member] | U.S. government agency securities                  
Investments                  
Cost       3,376     3,376   2,009
Gross Unrealized Gains       1     1   0
Gross Unrealized Losses       0     0   (2)
Fair Value       3,377     3,377   2,007
Long-term Investments [Member]                  
Investments                  
Cost       7,601,257     7,601,257   7,474,775
Gross Unrealized Gains       390,213     390,213   508,244
Gross Unrealized Losses       (37,056)     (37,056)   (51,656)
Fair Value       7,954,414     7,954,414   7,931,363
Long-term Investments [Member] | Foreign government securities                  
Investments                  
Cost       641,671     641,671   718,947
Gross Unrealized Gains       4,766     4,766   1,367
Gross Unrealized Losses       0     0   (683)
Fair Value       646,437     646,437   719,631
Long-term Investments [Member] | U.S. government securities                  
Investments                  
Cost       541,307     541,307   580,155
Gross Unrealized Gains       5,923     5,923   277
Gross Unrealized Losses       0     0   (1,982)
Fair Value       547,230     547,230   578,450
Long-term Investments [Member] | Corporate debt securities                  
Investments                  
Cost       4,535,904     4,535,904   4,294,282
Gross Unrealized Gains       47,999     47,999   1,273
Gross Unrealized Losses       (556)     (556)   (18,941)
Fair Value       4,583,347     4,583,347   4,276,614
Long-term Investments [Member] | U.S. government agency securities                  
Investments                  
Cost       1,000     1,000    
Gross Unrealized Gains       0     0    
Gross Unrealized Losses       0     0    
Fair Value       1,000     1,000    
Long-term Investments [Member] | U.S. municipal securities                  
Investments                  
Cost       1,064     1,064   1,080
Gross Unrealized Gains       10     10   3
Gross Unrealized Losses       0     0   0
Fair Value       1,074     1,074   1,083
Long-term Investments [Member] | Ctrip convertible debt securities | Ctrip.com International, Ltd. [Member]                  
Investments                  
Cost $ 500,000 $ 250,000 $ 500,000 1,250,000     1,250,000   1,250,000
Gross Unrealized Gains       92,975     92,975   158,600
Gross Unrealized Losses       (36,500)     (36,500)   (30,050)
Fair Value       1,306,475     1,306,475   1,378,550
Long-term Investments [Member] | Ctrip equity securities | Ctrip.com International, Ltd. [Member]                  
Investments                  
Cost       630,311     630,311   630,311
Gross Unrealized Gains       238,540     238,540   346,724
Gross Unrealized Losses       0     0   0
Fair Value       $ 868,851     $ 868,851   $ 977,035