Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS - Assets acquired and liabilities assumed (Details)

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ACQUISITIONS - Assets acquired and liabilities assumed (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Goodwill $ 730,139 $ 721,819 $ 653,176
Acquisitions      
Business Acquisition [Line Items]      
Accounts receivable, net 88    
Materials and supplies 149    
Equipment and property 1,148    
Goodwill 4,455    
Current liabilities (30)    
Other assets and liabilities, net 17    
Total consideration paid 14,399    
Less: Contingent consideration liability (1,176)    
Total cash purchase price 13,223    
Acquisitions | Customer Contracts      
Business Acquisition [Line Items]      
Intangible assets 8,165    
Acquisitions | Trademarks & Tradenames      
Business Acquisition [Line Items]      
Intangible assets 2    
Acquisitions | Other Intangible Assets      
Business Acquisition [Line Items]      
Intangible assets $ 405