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PROPERTY AND EQUIPMENT, NET (Schedule of Depreciation Expense) (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | ¥ 72,757 | ¥ 54,981 | ¥ 43,478
Cost of revenues [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | 61,967 | 48,553 | 38,088
Selling and marketing expenses [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | 3,226 | 2,694 | 2,253
General and administrative expenses [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | 6,455 | 3,031 | 2,649
Research and development expenses [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | ¥ 1,109 | ¥ 703 | ¥ 488

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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