Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS - Assets acquired and liabilities assumed (Details)

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ACQUISITIONS - Assets acquired and liabilities assumed (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill $ 721,819 $ 653,176 $ 572,847
Total cash purchase price 146,100 147,600  
Acquisitions      
Business Acquisition [Line Items]      
Accounts receivable, net 3,072 3,547  
Materials and supplies 891 582  
Equipment and property 8,184 7,269  
Goodwill 69,555 73,430  
Current liabilities (6,483) (15,518)  
Other assets and liabilities, net 288 9,639  
Total consideration paid 160,614 160,207  
Less: Contingent consideration liability (14,516) (12,594)  
Total cash purchase price 146,098 147,613  
Acquisitions | Customer Contracts, Net      
Business Acquisition [Line Items]      
Intangible assets 80,239 72,608  
Acquisitions | Trademarks & Tradenames, Net      
Business Acquisition [Line Items]      
Intangible assets 1,200 7,317  
Acquisitions | Other Intangible Assets, Net      
Business Acquisition [Line Items]      
Intangible assets $ 3,668 $ 1,333