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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unrealized gain on investments | $ 89,100,000 |  |  |  | $ 89,100,000 |
Gain on sale of equity investments | 2,200,000 |  |  |  |  |
Other than temporary impairments on equity method investments |  |  |  |  |  | $ 6,700,000
Goodwill impairment | 0 |  | $ 0 |  | 0 | 109,486,000
Impairment of long-lived assets | 7,651,000 |  | 3,296,000 |  | 7,651,000 | 39,550,000
Restructuring and related charges: |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impairment of right-of-use assets and leasehold improvements | 7,700,000 |  | 3,300,000 |  | 7,700,000 | 17,200,000
Impairment of long-lived assets | 7,651,000 |  | $ 3,296,000 |  | 7,651,000 | $ 17,199,000
Other equity investments |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unrealized gain on investments | $ 89,100,000 |  |  |  | 89,100,000 |
Percentage of other equity investment sold | 100.00% |  |  | 50.00% |  |
Equity method investments | $ 2,600,000 | $ 4,200,000 |  | $ 34,000,000 |  |
Other than temporary impairments on equity method investments | $ 0 |  |  | $ 6,700,000 | $ 0 |

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=124268079&loc=d3e32787-111569 + Details
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