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GOODWILL AND LONG-LIVED ASSETS - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) segment | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of reporting units | segment |  |  |  | 3 |  |
Goodwill impairment | $ 0 |  | $ 0 | $ 109,486 | $ 0 |
Intangible asset amortization expense | 2,400 |  | 3,800 | 4,900 | 7,700 |
Goodwill | 211,718 |  |  | 211,718 |  | $ 325,017
Long-lived asset impairment | 0 |  |  | 22,351 |  |
Long-lived asset impairment | 0 |  | $ 0 | 22,351 | $ 0 |
Leasehold improvements |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Long-lived asset impairment |  |  |  | 7,558 |  |
Leasehold improvements | Other Restructuring [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Long-lived asset impairment | 4,800 |  |  | 4,800 |  |
Right-of-use assets - operating leases, net |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Long-lived asset impairment |  |  |  | 19,645 |  |
Right-of-use assets - operating leases, net | Other Restructuring [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Long-lived asset impairment | 9,200 |  |  | 9,200 |  |
International |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  |  | 109,486 |  |
Goodwill | 26,600 |  |  | 26,600 |  | 146,332
Long-lived asset impairment | 400 | $ 22,400 |  |  |  |
North America |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  |  | 0 |  |
Goodwill | 178,685 |  |  | $ 178,685 |  | $ 178,685
Long-lived asset impairment | $ 13,500 |  |  |  |  |
Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, useful life |  |  |  | 1 year |  |
Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, useful life |  |  |  | 10 years |  |

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