Quarterly report pursuant to Section 13 or 15(d)

BUSINESS COMBINATIONS (Details)

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BUSINESS COMBINATIONS (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]    
Materials and supplies $ 21,527 $ 19,476
Goodwill 596,067 $ 572,847
Acquisitions [Member]    
Business Acquisition [Line Items]    
Accounts receivable, net 1,556  
Materials and supplies 103  
Equipment and property 2,850  
Goodwill 26,505  
Customer contracts 22,027  
Other intangible assets 3,029  
Current liabilities (6,827)  
Other assets and liabilities, net 2,987  
Total consideration paid 52,230  
Less:  Contingent consideration liability (4,644)  
Total cash purchase price $ 47,586