XML 64 R49.htm IDEA: XBRL DOCUMENT v3.8.0.1
INVESTMENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 12, 2016
Dec. 11, 2015
May 26, 2015
Aug. 07, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Oct. 31, 2017
Investments                
Weighted maturity of investments         1 year 5 months      
Marketable Securities, Realized Gain (Loss)         $ 700 $ 1,100 $ 2,200  
Cost Method Investments         450,900 7,600    
Impairment of cost-method investments         7,597 63,208 $ 0  
Short-term Investments                
Investments                
Cost         4,866,475 2,218,640    
Gross Unrealized Gains         700 1,397    
Gross Unrealized Losses         (7,302) (1,157)    
Fair Value         4,859,873 2,218,880    
Short-term Investments | International government securities                
Investments                
Cost         725,566 249,552    
Gross Unrealized Gains         246 221    
Gross Unrealized Losses         (436) (89)    
Fair Value         725,376 249,684    
Short-term Investments | U.S. government securities                
Investments                
Cost         996,112 456,971    
Gross Unrealized Gains         5 57    
Gross Unrealized Losses         (1,999) (140)    
Fair Value         994,118 456,888    
Short-term Investments | Corporate debt securities                
Investments                
Cost         3,067,703 1,510,119    
Gross Unrealized Gains         449 1,119    
Gross Unrealized Losses         (4,837) (928)    
Fair Value         3,063,315 1,510,310    
Short-term Investments | U.S. government agency securities                
Investments                
Cost         4,444      
Gross Unrealized Gains         0      
Gross Unrealized Losses         (30)      
Fair Value         4,414      
Short-term Investments | Commercial paper                
Investments                
Cost         72,650 1,998    
Gross Unrealized Gains         0 0    
Gross Unrealized Losses         0 0    
Fair Value         72,650 1,998    
Long-term Investments                
Investments                
Cost         10,072,468 9,407,136    
Gross Unrealized Gains         412,786 293,453    
Gross Unrealized Losses         (63,654) (109,522)    
Fair Value         10,421,600 9,591,067    
Long-term Investments | International government securities                
Investments                
Cost         607,000 655,857    
Gross Unrealized Gains         1,588 4,110    
Gross Unrealized Losses         (678) (623)    
Fair Value         607,910 659,344    
Long-term Investments | U.S. government securities                
Investments                
Cost         844,910 773,718    
Gross Unrealized Gains         2 337    
Gross Unrealized Losses         (10,636) (7,463)    
Fair Value         834,276 766,592    
Long-term Investments | Corporate debt securities                
Investments                
Cost         6,689,747 6,042,271    
Gross Unrealized Gains         8,399 9,973    
Gross Unrealized Losses         (41,722) (50,455)    
Fair Value         6,656,424 6,001,789    
Long-term Investments | U.S. government agency securities                
Investments                
Cost         500 4,979    
Gross Unrealized Gains         0 0    
Gross Unrealized Losses         (6) (27)    
Fair Value         494 4,952    
Ctrip.com International, Ltd.                
Investments                
Debt Investment, Term 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 1,275,000    
Gross Unrealized Gains         103,100 65,800    
Gross Unrealized Losses         (9,600) (47,712)    
Fair Value         1,368,500 1,293,088    
Ctrip.com International, Ltd. | Long-term Investments | Ctrip equity securities                
Investments                
Cost         655,311 655,311    
Gross Unrealized Gains         299,697 213,233    
Gross Unrealized Losses         (1,012) (3,242)    
Fair Value         $ 953,996 $ 865,302    
Meituan-Dianping [Member]                
Investments                
Cost Method Investments               $ 450,000