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BUSINESS DESCRIPTION & SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Finite lived intangible assets      
Impairment charge for goodwill $ 0 $ 0 $ 0
Preceding period of average stock price used to calculate impairment of reporting unit under the fair value model 3 months    
Goodwill $ 1,013,243 1,035,274  
Goodwill increase (decrease) (22,100)    
Amortization of intangible assets 39,500 50,700 $ 66,200
Expected amortization expense      
2022 30,850    
2023 23,963    
2024 10,617    
2025 3,180    
2026 2,529    
Thereafter 2,800    
Net carrying amount 73,939    
Customer Relationships      
Finite lived intangible assets      
Gross Carrying Amount 318,498 318,921  
Accumulated Amortization $ (244,559) (205,503)  
Customer Relationships | Minimum      
Finite lived intangible assets      
Useful Lives 5 years    
Customer Relationships | Maximum      
Finite lived intangible assets      
Useful Lives 11 years    
Tradenames      
Finite lived intangible assets      
Indefinitely renewable tradenames $ 10,600 $ 10,600