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LEASES - Schedule of Lease Costs and Other Lease Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Lease cost:          
Amortization of right-of-use assets $ 859 $ 503 $ 1,591 $ 912  
Interest expense 290 186 536 342  
Fixed lease cost 3,966 4,317 8,056 8,544  
Short-term lease cost 729 1,092 1,658 1,750  
Variable lease cost 129 35 261 42  
Total lease cost 5,973 6,133 12,102 11,590  
Cash paid for amounts included in the measurement of lease liabilities:          
Financing cash flows for finance leases 981 733 1,942 1,204  
Operating cash flows for operating leases 3,272 4,831 5,714 6,874  
Right-of-use assets obtained in exchange for new finance lease liabilities 5,391 4,384 11,793 6,857  
Right-of-use assets obtained in exchange for new operating lease liabilities $ 776 173 $ 3,142 588  
Weighted-average remaining lease term - finance leases (years) 6 years 1 month 6 days   6 years 1 month 6 days    
Weighted-average remaining lease term - operating leases (years) 11 years 9 months 18 days   11 years 9 months 18 days    
Weighted-average discount rate - finance leases 4.60%   4.60%   4.60%
Weighted-average discount rate - operating leases 5.10%   5.10%    
Vehicles, equipment and property          
Lease cost:          
Fixed lease cost $ 2,171 2,342 $ 4,588 4,921  
Landfill          
Lease cost:          
Fixed lease cost $ 1,795 $ 1,975 $ 3,468 $ 3,623