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LEASES (Lease Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease cost $ 53,194 $ 55,402
Finance lease cost:    
Amortization of ROU assets 4,966 1,142
Interest on lease liabilities 1,523 1,415
Total finance lease cost 6,489 2,557
Short-term lease cost 70,692 84,749
Variable lease cost 3,691 6,702
Total lease cost $ 134,066 $ 149,410