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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill impairment $ 0 $ 0   $ 0 $ 109,486,000
Impairment of long-lived assets   $ 13,903,000     36,254,000
Other than temporary impairments on equity method investments         $ 6,700,000
Other equity investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity method investments 4,200,000   $ 34,000,000.0 4,200,000  
Other than temporary impairments on equity method investments $ 0   $ 6,700,000 $ 0