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TAXATION (Reconciliation of Accrued Unrecognized Tax Positions) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥)
TAXATION |  |  |
Balance at the beginning of year | ¥ 65,093 | $ 10,215 | ¥ 98,984
Changes based on tax positions related to the current year | 19,766 | 3,102 | (6,446)
Additions related to prior year tax position | 8,692 | 1,364 | 2,171
Decreases related to prior year tax position | (7,580) | (1,189) | (20,304)
Decrease relating to expiration of applicable statute of limitation | (3,322) | (521) | (7,213)
Foreign currency translation | (748) | (117) | (2,099)
Balance at the end of year | ¥ 81,901 | $ 12,854 | ¥ 65,093

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