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Significant Accounting Policies - Convenience Translation, Cash & cash equivalents and time deposits (Details) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CNY (¥)
Cash and cash equivalents and time deposits |  |  |  |  |  |  |
Convenience translation rate (RMB to USD) | 6.5250 |  |  | 6.5250 |  |  |
Cash and cash equivalents and time deposits |  |  |  |  |  |  |
Cash and cash equivalents | ¥ 4,678,109,000 | ¥ 4,962,660,000 | ¥ 3,540,031,000 | $ 716,952 | $ 760,561 |  | ¥ 762,882,000
Time deposits | 4,720,089,000 | 1,844,558,000 | 749,385,000 | 723,385 |  |  |
Restricted cash | 0 | 0 | 0 |  |  |  |
PRC Subsidiaries and Variable Interest Entities |  |  |  |  |  |  |
Cash and cash equivalents and time deposits |  |  |  |  |  |  |
Cash and cash equivalents | ¥ 2,144,500,000 | ¥ 1,596,000,000.0 | ¥ 377,800,000 |  |  |  |
Cash and cash equivalents held by PRC subsidiaries and VIEs (as a percent) | 46.00% | 32.00% | 11.00% |  |  |  |
Cash held in accounts managed by online payment platforms |  |  |  |  |  |  |
Cash and cash equivalents and time deposits |  |  |  |  |  |  |
Cash and cash equivalents | ¥ 42,000,000.0 | ¥ 26,800,000 | ¥ 10,800,000 |  |  |  |
Denominated in US dollars |  |  |  |  |  |  |
Cash and cash equivalents and time deposits |  |  |  |  |  |  |
Cash and cash equivalents | 3,798,500,000 | 4,674,600,000 | 3,305,300,000 | 582,200 | 670,100 | $ 481,600 |
Time deposits | ¥ 4,705,100,000 | ¥ 1,844,600,000 | ¥ 749,400,000 | $ 721,100 | $ 264,400 | $ 109,200 |

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