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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Transfers into Level3 |  | $ 0 |  | $ 0
Transfers out of Level3 |  | 0 |  | 0
Impairment of Goodwill | $ 0 | 4,396 |  | $ 17,894
Impairment of property and equipment |  | 893 | $ 2,282 |
Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impairment of Goodwill |  | 4,396 |  |
Impairment of property and equipment |  | 893 |  |
Nonrecurring | Carrying value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill |  | 4,396 |  |
Property and equipment |  | 5,625 |  |
Level 3 | Nonrecurring | Fair value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Property and equipment |  | $ 4,732 |  |

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- Definition Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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