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ACQUISITIONS (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 15, 2018
Apr. 02, 2018
Jun. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill     $ 480,351 $ 395,504
MXD Group        
Business Acquisition [Line Items]        
Purchase price of outstanding equity in acquisition   $ 120,000    
Customer relationships and other intangibles   37,551    
Goodwill   $ 70,529    
Acquisition transaction costs     700  
Metro        
Business Acquisition [Line Items]        
Purchase price of outstanding equity in acquisition $ 53,000      
Customer relationships and other intangibles 3,000      
Tangible assets net of liabilities assumed 19,000      
Goodwill $ 30,000      
Acquisition transaction costs     $ 400