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Intangible assets, net (Schedule of Estimated Amortization Expenses) (Details) - Intangible Assets [Member]
¥ in Thousands
Dec. 31, 2018
CNY (¥)
Amortization expense of intangible assets  
2019 ¥ 22,710
2020 13,010
2021 4,563
2022 4,060
2023 ¥ 3,978