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OPERATING SEGMENTS - Reconciliation of EBITDA (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Reconciliation of Net Income to Adjusted EBITDA    
Net (loss) income $ (298,086) $ 8,043
Income tax (benefit) expense (263) 3,041
Interest expense 9,310 4,030
Interest income (89) (207)
Foreign currency (gain) loss (937) 139
Other income (171) (110)
Property and equipment impairment charges   25
Goodwill impairment charges 300,300  
Depreciation and amortization of plant and equipment 17,978 8,125
Amortization of intangibles assets 9,441 2,811
Share-based compensation 1,564 1,222
Accretion and non-cash adjustment of closure & post-closure liabilities 1,266 1,125
Gain on property insurance recoveries   (4,653)
Business development and integration expenses 2,907 141
Adjusted EBITDA 43,220 23,732
Operating Segment | Environmental Services    
Reconciliation of Net Income to Adjusted EBITDA    
Adjusted EBITDA 46,124 35,260
Operating Segment | Field and Industrial Services    
Reconciliation of Net Income to Adjusted EBITDA    
Adjusted EBITDA 14,478 2,554
Corporate    
Reconciliation of Net Income to Adjusted EBITDA    
Adjusted EBITDA $ (17,382) $ (14,082)