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INVESTMENTS (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Aug. 06, 2014
Aug. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Investments          
Weighted maturity of investments     1 year 6 months    
Marketable Securities, Realized Gain (Loss)     $ 1,800 $ 0  
Ctrip.com International, Ltd. [Member]          
Investments          
Debt Investment, Term 5 years        
Period over which Ctrip ADSs can be acquired   12 months      
Maximum Ownership Percentage in Ctrip   10.00%      
Short-term Investments [Member]          
Investments          
Cost     1,379,989   $ 1,142,881
Gross Unrealized Gains     86   39
Gross Unrealized Losses     (434)   (738)
Fair Value     1,379,641   1,142,182
Short-term Investments [Member] | Foreign government securities          
Investments          
Cost     141,303   52,524
Gross Unrealized Gains     3   0
Gross Unrealized Losses     (40)   (34)
Fair Value     141,266   52,490
Short-term Investments [Member] | U.S. government securities          
Investments          
Cost     655,798   364,276
Gross Unrealized Gains     21   24
Gross Unrealized Losses     (75)   (34)
Fair Value     655,744   364,266
Short-term Investments [Member] | Corporate debt securities          
Investments          
Cost     546,066   582,160
Gross Unrealized Gains     62   15
Gross Unrealized Losses     (318)   (652)
Fair Value     545,810   581,523
Short-term Investments [Member] | Commercial paper          
Investments          
Cost     32,198   39,092
Gross Unrealized Gains     0   0
Gross Unrealized Losses     0   0
Fair Value     32,198   39,092
Short-term Investments [Member] | U.S. government agency securities          
Investments          
Cost     4,624   104,829
Gross Unrealized Gains     0   0
Gross Unrealized Losses     (1)   (18)
Fair Value     4,623   104,811
Long-term Investments [Member]          
Investments          
Cost     4,965,748   3,920,019
Gross Unrealized Gains     26,871   2,476
Gross Unrealized Losses     (18,975)   (166,842)
Fair Value     4,973,644   3,755,653
Long-term Investments [Member] | Foreign government securities          
Investments          
Cost     311,247   12,707
Gross Unrealized Gains     119   0
Gross Unrealized Losses     (112)   (36)
Fair Value     311,254   12,671
Long-term Investments [Member] | U.S. government securities          
Investments          
Cost     697,558   557,130
Gross Unrealized Gains     4,001   80
Gross Unrealized Losses     (42)   (762)
Fair Value     701,517   556,448
Long-term Investments [Member] | Corporate debt securities          
Investments          
Cost     3,031,365   2,332,030
Gross Unrealized Gains     12,635   2,299
Gross Unrealized Losses     (1,333)   (5,296)
Fair Value     3,042,667   2,329,033
Long-term Investments [Member] | U.S. government agency securities          
Investments          
Cost     2,542   95,108
Gross Unrealized Gains     4   97
Gross Unrealized Losses     0   (111)
Fair Value     2,546   95,094
Long-term Investments [Member] | U.S. municipal securities          
Investments          
Cost     1,106   1,114
Gross Unrealized Gains     1   0
Gross Unrealized Losses     0   (12)
Fair Value     1,107   1,102
Long-term Investments [Member] | Ctrip corporate debt securities | Ctrip.com International, Ltd. [Member]          
Investments          
Cost   $ 500,000 500,000   500,000
Gross Unrealized Gains     0   0
Gross Unrealized Losses     (17,488)   (74,039)
Fair Value     482,512   425,961
Long-term Investments [Member] | Ctrip equity securities | Ctrip.com International, Ltd. [Member]          
Investments          
Cost     421,930   421,930
Gross Unrealized Gains     10,111   0
Gross Unrealized Losses     0   (86,586)
Fair Value     $ 432,041   $ 335,344