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LEASES - Supplemental Cash Flow (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Cash paid for amounts included in operating cash flows from finance leases $ (522) $ (1,021) $ 0
Cash paid for amounts included in operating cash flows from operating leases (36,864) (36,723) 0
Payments of finance lease obligations (8,930) (19,687) (33,023)
Right-of-use assets obtained in exchange for finance leases 0 3,929 0
Right-of-use assets obtained in exchange for operating leases $ 16,415 $ 27,293 $ 0