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LEASE - Total leases - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Leases    
Short-term $ 37,091 $ 44,765
Long-term 15,602 33,794
Total lease liabilities 52,693 78,559
Operating lease liabilities, current 15,204 18,767
Operating lease liabilities, noncurrent 13,232 20,718
Total operating lease liabilities 28,436 39,485
Finance lease liabilities, current 21,887 25,998
Finance lease liabilities, noncurrent 2,370 13,076
Total Finance lease liabilities $ 24,257 $ 39,074