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TAXATION (Schedule of Principal Components of the Group's Deferred Tax Assets and Liabilities) (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax asset: |  |
Accrued expense | ¥ 5,942 | ¥ 7,028
Allowance for doubtful accounts | 45,032 | 47,593
Tax loss carried forward | 259,740 | 359,908
Deferred advertising expense | 472 | 670
Impairment of long-lived tangible assets | 424 | 19,691
Total deferred tax assets | 311,610 | 434,890
Valuation allowance | (278,437) | (403,485)
Deferred tax assets, net of valuation allowance | 33,173 | 31,405
Deferred tax liabilities: |  |
Unrecognized valuation surplus and deficit -acquisition | 79,834 | 79,834
Unrecognized valuation surplus and deficit - decrease due to amortization and impairment | (58,272) | (56,677)
Unrealized profit of short-term investments | 142 | 26
Accelerated fixed assets depreciation | 1,229 | 0
Total deferred tax liabilities | 22,933 | 23,183
Deferred tax assets, net of valuation allowance and deferred tax liabilities | ¥ 10,240 | ¥ 8,222

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