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INVESTMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 12, 2016
Dec. 11, 2015
May 26, 2015
Aug. 07, 2014
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Investments              
Weighted maturity of investments         2 years    
Marketable Securities, Realized Gain (Loss)         $ 200 $ (2,900)  
Cost Method Investments         7,600   $ 7,600
Cost-method Investments, Other than Temporary Impairment         0 50,350  
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           $ 50,350  
Short-term Investments [Member]              
Investments              
Cost         2,935,185   2,218,640
Gross Unrealized Gains         2,753   1,397
Gross Unrealized Losses         (1,780)   (1,157)
Fair Value         2,936,158   2,218,880
Short-term Investments [Member] | International government securities              
Investments              
Cost         517,398   249,552
Gross Unrealized Gains         1,254   221
Gross Unrealized Losses         (187)   (89)
Fair Value         518,465   249,684
Short-term Investments [Member] | U.S. government securities              
Investments              
Cost         580,630   456,971
Gross Unrealized Gains         17   57
Gross Unrealized Losses         (427)   (140)
Fair Value         580,220   456,888
Short-term Investments [Member] | Corporate debt securities              
Investments              
Cost         1,831,179   1,510,119
Gross Unrealized Gains         1,482   1,119
Gross Unrealized Losses         (1,166)   (928)
Fair Value         1,831,495   1,510,310
Short-term Investments [Member] | Commercial paper              
Investments              
Cost         5,978   1,998
Gross Unrealized Gains         0   0
Gross Unrealized Losses         0   0
Fair Value         5,978   1,998
Long-term Investments [Member]              
Investments              
Cost         9,602,027   9,407,136
Gross Unrealized Gains         591,868   293,453
Gross Unrealized Losses         (53,265)   (109,522)
Fair Value         10,140,630   9,591,067
Long-term Investments [Member] | International government securities              
Investments              
Cost         450,445   655,857
Gross Unrealized Gains         1,894   4,110
Gross Unrealized Losses         (788)   (623)
Fair Value         451,551   659,344
Long-term Investments [Member] | U.S. government securities              
Investments              
Cost         828,777   773,718
Gross Unrealized Gains         286   337
Gross Unrealized Losses         (6,744)   (7,463)
Fair Value         822,319   766,592
Long-term Investments [Member] | Corporate debt securities              
Investments              
Cost         6,387,523   6,042,271
Gross Unrealized Gains         10,334   9,973
Gross Unrealized Losses         (37,658)   (50,455)
Fair Value         6,360,199   6,001,789
Long-term Investments [Member] | U.S. government agency securities              
Investments              
Cost         4,971   4,979
Gross Unrealized Gains         0   0
Gross Unrealized Losses         (25)   (27)
Fair Value         4,946   4,952
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
Gross Unrealized Gains         171,425   65,800
Gross Unrealized Losses         (8,050)   (47,712)
Fair Value         1,438,375   1,293,088
Long-term Investments [Member] | Ctrip equity securities | Ctrip.com International, Ltd. [Member]              
Investments              
Cost         655,311   655,311
Gross Unrealized Gains         407,929   213,233
Gross Unrealized Losses         0   (3,242)
Fair Value         $ 1,063,240   $ 865,302