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Long-term Investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Long-term investments      
Balance at the beginning of the year $ 294,679 $ 63,777 $ 22,255
Investments made 152,091 252,256 47,666
Loss from equity method investment (130) (6) (5)
Impairment on investments (31,586) (6,608) (2,521)
Disposal of investments (11,010) (13,134)  
Transfer from long-term investments to a wholly owned subsidiary     (1,189)
Unrealized loss (2,557) (198) (2,067)
Currency translation adjustment (1,554) (1,408) (362)
Balance at the end of year 399,933 294,679 63,777
Investment related impairment 40,161 8,005 2,521
Write-off on an online-to-offline business, included in investment impairment 19,000    
Write-off on an employment-oriented social company, included in investment impairment 10,500    
Cost Method      
Long-term investments      
Balance at the beginning of the year 281,707 50,594 22,255
Investments made 147,767 252,256 32,412
Impairment on investments (31,586) (6,608) (2,521)
Disposal of investments (6,010) (13,134)  
Transfer from long-term investments to a wholly owned subsidiary     (1,189)
Currency translation adjustment (1,548) (1,401) (363)
Balance at the end of year 390,330 281,707 50,594
Equity Method      
Long-term investments      
Balance at the beginning of the year 141 154  
Investments made 4,324   158
Loss from equity method investment (130) (6) (5)
Currency translation adjustment (6) (7) 1
Balance at the end of year 4,329 141 154
Available-for-Sale Securities      
Long-term investments      
Balance at the beginning of the year 12,831 13,029  
Investments made     15,096
Disposal of investments (5,000)    
Unrealized loss (2,557) (198) (2,067)
Balance at the end of year 5,274 $ 12,831 $ 13,029
Impairment charged to net income 4,800    
Yixia      
Long-term investments      
Investments made 120,000    
Aggregate equity investment 190,000    
A company which primarily provides online literature      
Long-term investments      
Aggregate equity investment $ 14,400