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EQUITY INVESTMENTS (Equity Investment Income Statement Disclosure) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Gross revenue $ 247,358 $ 299,338
Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Schedule of Equity Method Investments [Line Items]    
Gross revenue 66,805 97,383
Net loss $ (13,606) $ (85,031)