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FAIR VALUE MEASUREMENTS (Schedule of Fair Value Measurements for Each Class of Assets on Nonrecurring Basis) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥)
FAIR VALUE MEASUREMENTS [Line Items] |  |  |  |
Available-for-sale debt investments |  | ¥ 50,000 |  | ¥ 0
Recurring [Member] |  |  |  |
FAIR VALUE MEASUREMENTS [Line Items] |  |  |  |
Available-for-sale debt investments |  | 50,000 |  |
Total loss |  | 0 |  |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
FAIR VALUE MEASUREMENTS [Line Items] |  |  |  |
Available-for-sale debt investments |  | 50,000 |  |
Recurring [Member] | Significance Other Observable Inputs (Level 2) [Member] |  |  |  |
FAIR VALUE MEASUREMENTS [Line Items] |  |  |  |
Available-for-sale debt investments |  | 0 |  |
Recurring [Member] | Significant unobservable inputs (Level 3) [Member] |  |  |  |
FAIR VALUE MEASUREMENTS [Line Items] |  |  |  |
Available-for-sale debt investments |  | 0 |  |
Nonrecurring [Member] |  |  |  |
FAIR VALUE MEASUREMENTS [Line Items] |  |  |  |
Long-lived assets held and used |  | 3,467 | $ 285 | 1,985
Total loss | ¥ (6,849) | (4,418) |  |
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
FAIR VALUE MEASUREMENTS [Line Items] |  |  |  |
Long-lived assets held and used |  | 0 |  | 0
Nonrecurring [Member] | Significance Other Observable Inputs (Level 2) [Member] |  |  |  |
FAIR VALUE MEASUREMENTS [Line Items] |  |  |  |
Long-lived assets held and used |  | 0 |  | 0
Nonrecurring [Member] | Significant unobservable inputs (Level 3) [Member] |  |  |  |
FAIR VALUE MEASUREMENTS [Line Items] |  |  |  |
Long-lived assets held and used |  | ¥ 3,467 |  | ¥ 1,985

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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