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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 |  |

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