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LEASES - Schedule of Lease Costs and Other Lease Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease cost:    
Amortization of right-of-use assets $ 3,736 $ 2,122
Interest expense 1,201 767
Fixed lease cost 16,257 17,270
Short-term lease cost 3,430 3,878
Variable lease cost 514 190
Total lease cost 25,138 24,227
Cash paid for amounts included in the measurement of lease liabilities:    
Financing cash flows for finance leases 4,940 2,601
Operating cash flows for operating leases 13,078 13,840
Right-of-use assets obtained in exchange for new finance lease liabilities 18,003 9,433
Right-of-use assets obtained in exchange for new operating lease liabilities $ 3,845 3,351
Weighted-average remaining lease term - finance leases (years) 5 years 8 months 12 days  
Weighted-average remaining lease term - operating leases (years) 10 years 7 months 6 days  
Weighted-average discount rate - finance leases 4.20%  
Weighted-average discount rate - operating leases 4.80%  
Machinery and equipment    
Lease cost:    
Fixed lease cost $ 8,476 9,559
Landfills    
Lease cost:    
Fixed lease cost $ 7,781 $ 7,711