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BUSINESS ACQUISITIONS - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Apr. 30, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Goodwill $ 300,643   $ 261,767
CVI      
Business Acquisition [Line Items]      
Accounts receivable   $ 4,397  
Costs in excess of billings   2,484  
Goodwill   38,612  
Property and equipment   85  
Other assets   2,456  
Assets acquired   59,440  
Current liabilities assumed   (9,781)  
Net assets acquired   49,659  
CVI | Non-compete agreements      
Business Acquisition [Line Items]      
Finite-lived intangibles   730  
CVI | Customer relationships      
Business Acquisition [Line Items]      
Finite-lived intangibles   $ 10,676