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INVESTMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 12, 2016
Dec. 11, 2015
May 26, 2015
Aug. 07, 2014
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Investments                  
Weighted average life of all fixed income investments, excluding the Company's investment in Ctrip convertible debt securities             1 year 8 months    
Marketable Securities, Realized Gain (Loss)         $ 0 $ 2,100 $ 200 $ (800)  
Cost Method Investments         7,600   7,600   $ 7,600
Impairment of cost-method investment         0 $ 12,858 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         3,722,711   3,722,711   2,218,640
Gross Unrealized Gains         1,996   1,996   1,397
Gross Unrealized Losses         (2,882)   (2,882)   (1,157)
Fair Value         3,721,825   3,721,825   2,218,880
Short-term Investments | International government securities                  
Investments                  
Cost         650,576   650,576   249,552
Gross Unrealized Gains         920   920   221
Gross Unrealized Losses         (418)   (418)   (89)
Fair Value         651,078   651,078   249,684
Short-term Investments | U.S. government securities                  
Investments                  
Cost         746,814   746,814   456,971
Gross Unrealized Gains         8   8   57
Gross Unrealized Losses         (690)   (690)   (140)
Fair Value         746,132   746,132   456,888
Short-term Investments | Corporate debt securities                  
Investments                  
Cost         2,311,980   2,311,980   1,510,119
Gross Unrealized Gains         1,068   1,068   1,119
Gross Unrealized Losses         (1,774)   (1,774)   (928)
Fair Value         2,311,274   2,311,274   1,510,310
Short-term Investments | Commercial paper                  
Investments                  
Cost         13,341   13,341   1,998
Gross Unrealized Gains         0   0   0
Gross Unrealized Losses         0   0   0
Fair Value         13,341   13,341   1,998
Long-term Investments                  
Investments                  
Cost         9,527,130   9,527,130   9,407,136
Gross Unrealized Gains         775,105   775,105   293,453
Gross Unrealized Losses         (38,576)   (38,576)   (109,522)
Fair Value         10,263,659   10,263,659   9,591,067
Long-term Investments | International government securities                  
Investments                  
Cost         447,860   447,860   655,857
Gross Unrealized Gains         1,096   1,096   4,110
Gross Unrealized Losses         (992)   (992)   (623)
Fair Value         447,964   447,964   659,344
Long-term Investments | U.S. government securities                  
Investments                  
Cost         801,179   801,179   773,718
Gross Unrealized Gains         179   179   337
Gross Unrealized Losses         (6,242)   (6,242)   (7,463)
Fair Value         795,116   795,116   766,592
Long-term Investments | Corporate debt securities                  
Investments                  
Cost         6,342,818   6,342,818   6,042,271
Gross Unrealized Gains         9,511   9,511   9,973
Gross Unrealized Losses         (31,315)   (31,315)   (50,455)
Fair Value         6,321,014   6,321,014   6,001,789
Long-term Investments | U.S. government agency securities                  
Investments                  
Cost         4,962   4,962   4,979
Gross Unrealized Gains         0   0   0
Gross Unrealized Losses         (27)   (27)   (27)
Fair Value         4,935   4,935   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         254,500   254,500   65,800
Gross Unrealized Losses         0   0   (47,712)
Fair Value         1,529,500   1,529,500   1,293,088
Long-term Investments | Ctrip equity securities | Ctrip.com International, Ltd.                  
Investments                  
Cost         655,311   655,311   655,311
Gross Unrealized Gains         509,819   509,819   213,233
Gross Unrealized Losses         0   0   (3,242)
Fair Value         $ 1,165,130   $ 1,165,130   $ 865,302