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FINANCE LEASE LIABILITY (Obligations) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Other Liabilities Disclosure [Abstract]    
Finance lease liability, current portion $ 50,025 $ 48,887
Finance lease liability, long-term portion 498,823 524,200
Finance lease liability $ 548,848 $ 573,087