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LEASES - Cash flow (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
LEASES      
Operating cash flows for operating leases $ 3,870 $ 9,124  
Operating cash flows for finance leases 377 891  
Financing cash flows for finance leases 8,368 46,725 $ 29,353
Operating leases, Right-of-use assets obtained in exchange for lease obligations $ 278 $ 25,593