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BUSINESS COMBINATIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Oct. 08, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill $ 1,227,042   $ 527,023 $ 525,013
HydroChemPSC        
Business Acquisition [Line Items]        
Accounts receivable, including unbilled receivables   $ 131,924    
Inventories and supplies   3,162    
Prepaid expenses and other current assets   16,016    
Property, plant and equipment   313,540    
Other intangibles   289,000    
Operating lease right-of-use assets   34,347    
Other non-current assets   1,045    
Current liabilities   (115,704)    
Current portion of operating lease liabilities   (11,659)    
Operating lease liabilities, less current portion   (26,128)    
Deferred tax liabilities   (85,908)    
Other long-term liabilities   (2,685)    
Total identifiable net assets   546,950    
Goodwill   683,463    
Total purchase price   $ 1,230,413