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Accumulated other comprehensive loss (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
Accumulated other comprehensive income |  |  |  |
Balance |  | ¥ 14,250,576 | ¥ 5,781,804 | ¥ 3,613,267
Foreign currency translation, net of tax of nil | $ (1,030) | (7,083) | 342,348 | (288,956)
Fair value changes of available-for-sale investments, net of tax of nil |  |  | 32,633 | (17,042)
Reclassification adjustment for losses included in net income, net of tax of nil |  |  | (55,615) | 36,567
Balance | $ 2,503,208 | 17,210,793 | 14,250,576 | 5,781,804
Tax on Foreign currency translation |  | 0 | 0 | 0
Tax on Fair value change of available-for-sale investments |  | 0 |  |
Adoption of new accounting standards |  | 176,370 |  |
Accumulated other comprehensive income (loss) |  |  |  |
Accumulated other comprehensive income |  |  |  |
Balance |  | (24,242) | (343,608) | (70,981)
Foreign currency translation, net of tax of nil |  | (7,083) | 342,348 | (292,152)
Fair value changes of available-for-sale investments, net of tax of nil |  |  | 32,633 | (17,042)
Reclassification adjustment for losses included in net income, net of tax of nil |  |  | (55,615) | 36,567
Balance |  | (30,883) | (24,242) | (343,608)
Tax on Foreign currency translation |  | 0 | 0 | 0
Tax on Fair value change of available-for-sale investments |  |  | 0 | 0
Tax on Reclassification adjustment for losses included in net income |  |  | 0 | 0
Adoption of new accounting standards |  | 442 |  |
Accumulated other comprehensive income (loss) | ASU 2016-01 |  |  |  |
Accumulated other comprehensive income |  |  |  |
Adoption of new accounting standards |  | 442 |  |
Cumulative Translation Adjustments |  |  |  |
Accumulated other comprehensive income |  |  |  |
Balance |  | (23,800) | (366,148) | (73,996)
Foreign currency translation, net of tax of nil |  | (7,083) | 342,348 | (292,152)
Balance |  | (30,883) | (23,800) | (366,148)
Unrealized Gain and (Loss) on Available-for-sale Securities |  |  |  |
Accumulated other comprehensive income |  |  |  |
Balance |  | (442) | 22,540 | 3,015
Fair value changes of available-for-sale investments, net of tax of nil |  |  | 32,633 | (17,042)
Reclassification adjustment for losses included in net income, net of tax of nil |  |  | (55,615) | 36,567
Balance |  |  | ¥ (442) | ¥ 22,540
Unrealized Gain and (Loss) on Available-for-sale Securities | ASU 2016-01 |  |  |  |
Accumulated other comprehensive income |  |  |  |
Adoption of new accounting standards |  | ¥ 442 |  |

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