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INVESTMENTS (Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 12, 2016
Dec. 11, 2015
May 26, 2015
Aug. 07, 2014
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities                  
Weighted maturity of investments             2 years    
Marketable Securities, Realized Gain (Loss)             $ 1,100 $ 2,200  
Cost Method Investments             7,600 62,300  
Cost-method Investments, Other than Temporary Impairment             63,208 0 $ 0
Short-term investments:                  
Investments                  
Cost             2,218,640 1,171,756  
Gross Unrealized Gains             1,397 522  
Gross Unrealized Losses             (1,157) (1,032)  
Fair Value             2,218,880 1,171,246  
Short-term investments: | International government securities                  
Investments                  
Cost             249,552 395,404  
Gross Unrealized Gains             221 497  
Gross Unrealized Losses             (89) (104)  
Fair Value             249,684 395,797  
Short-term investments: | U.S. government securities                  
Investments                  
Cost             456,971 457,001  
Gross Unrealized Gains             57 0  
Gross Unrealized Losses             (140) (507)  
Fair Value             456,888 456,494  
Short-term investments: | Corporate debt securities                  
Investments                  
Cost             1,510,119 305,654  
Gross Unrealized Gains             1,119 25  
Gross Unrealized Losses             (928) (419)  
Fair Value             1,510,310 305,260  
Short-term investments: | Commercial paper                  
Investments                  
Cost             1,998 11,688  
Gross Unrealized Gains             0 0  
Gross Unrealized Losses             0 0  
Fair Value             1,998 11,688  
Short-term investments: | U.S. government agency securities                  
Investments                  
Cost               2,009  
Gross Unrealized Gains               0  
Gross Unrealized Losses               (2)  
Fair Value               2,007  
Long-term investments:                  
Investments                  
Cost             9,407,136 7,474,775  
Gross Unrealized Gains             293,453 508,244  
Gross Unrealized Losses             (109,522) (51,656)  
Fair Value             9,591,067 7,931,363  
Long-term investments: | International government securities                  
Investments                  
Cost             655,857 718,947  
Gross Unrealized Gains             4,110 1,367  
Gross Unrealized Losses             (623) (683)  
Fair Value             659,344 719,631  
Long-term investments: | U.S. government securities                  
Investments                  
Cost             773,718 580,155  
Gross Unrealized Gains             337 277  
Gross Unrealized Losses             (7,463) (1,982)  
Fair Value             766,592 578,450  
Long-term investments: | Corporate debt securities                  
Investments                  
Cost             6,042,271 4,294,282  
Gross Unrealized Gains             9,973 1,273  
Gross Unrealized Losses             (50,455) (18,941)  
Fair Value             6,001,789 4,276,614  
Long-term investments: | U.S. municipal securities                  
Investments                  
Cost               1,080  
Gross Unrealized Gains               3  
Gross Unrealized Losses               0  
Fair Value               1,083  
Long-term investments: | U.S. government agency securities                  
Investments                  
Cost             4,979    
Gross Unrealized Gains             0    
Gross Unrealized Losses             (27)    
Fair Value             4,952    
Ctrip.com International, Ltd.                  
Schedule of Available-for-sale Securities                  
Term of Ctrip senior convertible notes (in years) 6 years 10 years 5 years 5 years          
Maximum Ownership Percentage in Ctrip     15.00%            
Ctrip.com International, Ltd. | Long-term investments: | Ctrip convertible debt securities                  
Investments                  
Cost $ 25,000 $ 500,000 $ 250,000 $ 500,000     1,275,000 1,250,000  
Gross Unrealized Gains             65,800 158,600  
Gross Unrealized Losses             (47,712) (30,050)  
Fair Value             1,293,088 1,378,550  
Ctrip.com International, Ltd. | Long-term investments: | Ctrip equity securities                  
Investments                  
Cost             655,311 630,311  
Gross Unrealized Gains             213,233 346,724  
Gross Unrealized Losses             (3,242) 0  
Fair Value             865,302 $ 977,035  
Hotel Urbano                  
Schedule of Available-for-sale Securities                  
Cost-method Investments, Other than Temporary Impairment         $ 10,000 $ 50,000      
Other Cost Method Investments                  
Schedule of Available-for-sale Securities                  
Cost-method Investments, Other than Temporary Impairment         $ 3,000        
American Depositary Shares | Ctrip.com International, Ltd. | Long-term investments: | Ctrip equity securities                  
Investments                  
Cost             630,300    
Ordinary Shares | Ctrip.com International, Ltd. | Long-term investments: | Ctrip equity securities                  
Investments                  
Cost             $ 25,000