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Intangible Asset -Estimated annual amortization expense (Details) - Dec. 31, 2018
¥ in Thousands, $ in Thousands
USD ($)
CNY (¥)
Intangible Asset    
2019 $ 89,951 ¥ 618,458
2020 89,951 618,458
2021 89,951 618,458
2022 89,951 618,458
2023 $ 16,017 ¥ 110,125