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BUSINESS COMBINATIONS - 2020 (Details) - USD ($)
Jan. 28, 2020
Jun. 30, 2020
Dec. 31, 2019
Acquisition      
Goodwill   $ 469,278,000 $ 766,980,000
Impact Environmental Services Inc      
Acquisition      
Total purchase price $ 3,300,000    
Goodwill   300,000  
Field and Industrial Services      
Acquisition      
Goodwill   300,023,000 298,579,000
Field and Industrial Services | Impact Environmental Services Inc      
Acquisition      
Goodwill 300,000    
Identifiable intangible assets $ 900,000    
Weighted average amortization period 12 years    
Amortization period of goodwill recognized and expected to be deductible for income tax purposes 15 years    
Environmental Services      
Acquisition      
Goodwill   $ 476,425,000 $ 475,271,000