REVENUES - Treatment and Disposal Revenue (Details) - Treatment and disposal - T	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Event Business
Disaggregation of revenue
Threshold Tons of Non-recurring projects			1,000
Revenue (in percent)	27.00%	23.00%	26.00%	19.00%
Base Business
Disaggregation of revenue
Revenue (in percent)	73.00%	77.00%	74.00%	81.00%