Quarterly report pursuant to Section 13 or 15(d)

BUSINESS COMBINATIONS (Details)

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BUSINESS COMBINATIONS (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Business Acquisition [Line Items]    
Materials and supplies $ 29,952 $ 30,843
Goodwill 664,118 $ 653,176
Acquisitions [Member]    
Business Acquisition [Line Items]    
Accounts receivable, net 504  
Materials and supplies 128  
Equipment and property 1,613  
Goodwill 11,732  
Customer contracts 17,994  
Other intangible assets 291  
Current liabilities (142)  
Other assets and liabilities, net 163  
Total consideration paid 32,283  
Less: Contingent consideration liability (3,898)  
Total cash purchase price $ 28,385