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LEASES - Components of Lease Expense and Payments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
LEASES      
Operating lease cost $ 4,225 $ 4,047  
Short-term lease cost 408 543  
Variable lease cost 1,065 803  
Total operating lease cost 5,698 5,393  
Payments for lease liabilities 3,500 3,500  
Lease liabilities arising from ROU 2,200    
Finance lease cost:      
Amortization of right-of-use asset 574 571  
Variable costs 196 272  
Total finance lease cost 770 $ 843  
Finance leases cost included in property, plant and equipment 26,500   $ 25,400
Accumulated amortization related to finance leases 10,100   9,500
Principal payments, finance lease liabilities 100    
Additional finance lease liabilities recognized 1,100    
Total 2,225   $ 1,129
Finance lease liability, current $ 400