REVENUES - Treatment and Disposal Revenue (Details) - Treatment and disposal - T	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Event Business
Disaggregation of revenue
Threshold Tons of Non-recurring projects	1,000
Revenue (in percent)	25.00%	15.00%
Base Business
Disaggregation of revenue
Revenue (in percent)	75.00%	85.00%

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