Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS - Narrative (Details)

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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Goodwill $ 665,645 $ 653,176
Increase in goodwill due to acquisition 15,500  
Decrease in goodwill due to foreign currency translation 3,100  
Intangible assets, net 402,538  
Finite-Lived Intangible Assets, Net 297,155  
Trademarks & Tradenames, Net    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, net 108,200 109,000
Customer Contracts, Net    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Net 284,393 298,900
Other Intangible Assets, Net    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, net 9,900 10,800
Finite-Lived Intangible Assets, Net 512  
Non-US    
Finite-Lived Intangible Assets [Line Items]    
Goodwill 78,600 81,400
Non-US | Trademarks & Tradenames, Net    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, net 2,900 3,300
Non-US | Customer Contracts, Net    
Finite-Lived Intangible Assets [Line Items]    
Goodwill 40,200 45,700
Non-US | Other Intangible Assets, Net    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, net $ 700 $ 1,000