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Employee Benefit Plans - Additional Information (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee Benefit Plans |  |  |
Contribution for multi-employer defined contribution plan | ¥ 225,776 | ¥ 203,524 | ¥ 163,234

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