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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Transfers into Level3 |  |  | $ 0 | $ 0 | $ 0
Transfers out of Level3 |  |  | 0 | 0 | 0
Impairment of Goodwill | $ 0 |  | 266,934 | 4,396 |
Impairment of property and equipment |  |  | 7,910 | 3,715 | 6,657
Impairment of investments |  | $ 2,000 |  |  | 2,000
Recurring | September 30 | Carrying value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  |  | 1,768 |  |
Recurring | December 31 | Carrying value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  |  | 3,377 |  |
Nonrecurring | March 31 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cost-Method Investment |  |  |  |  | 2,000
Impairment of Goodwill |  |  | 266,934 | 4,396 |
Impairment of Trademark |  |  | 9,082 |  |
Impairment of property and equipment |  |  | 3,184 | 519 |
Nonrecurring | March 31 | Carrying value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill |  |  | 266,934 | 4,396 |
Trademark |  |  | 23,442 |  |
Cost-Method Investment |  |  |  |  | 2,500
Property and equipment. |  |  | 3,360 | 2,865 |
Nonrecurring | June 30 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of property and equipment |  |  | 4,726 | 374 | 2,282
Nonrecurring | June 30 | Carrying value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Property and equipment. |  |  | 4,726 | 2,760 | 2,282
Nonrecurring | September 30 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of property and equipment |  |  |  | 49 |
Nonrecurring | September 30 | Carrying value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Property and equipment. |  |  |  | 87 |
Nonrecurring | December 31 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of Goodwill |  |  |  |  | 17,894
Impairment of property and equipment |  |  |  | 2,773 | 4,375
Nonrecurring | December 31 | Carrying value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill |  |  |  |  | 24,894
Property and equipment. |  |  |  | 5,328 | 14,637
Level 1 | Recurring | December 31 | Fair value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  |  | 3,377 |  |
Level 2 | Recurring | September 30 | Fair value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments |  |  | 1,768 |  |
Level 3 | Nonrecurring | March 31 | Fair value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Trademark |  |  | 14,360 |  |
Cost-Method Investment |  |  |  |  | 500
Property and equipment. |  |  | $ 176 | 2,346 |
Level 3 | Nonrecurring | June 30 | Fair value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Property and equipment. |  |  |  | 2,386 |
Level 3 | Nonrecurring | September 30 | Fair value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Property and equipment. |  |  |  | 38 |
Level 3 | Nonrecurring | December 31 | Fair value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill |  |  |  |  | 7,000
Property and equipment. |  |  |  | $ 2,555 | $ 10,262

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