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INTANGIBLE ASSETS, NET - Intangible Assets, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets, Net [Abstract]    
Total $ 91,546 $ 86,382
Tradenames [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total 39,456 38,790
Customer and Referral Relationships [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total 50,076 45,643
Accumulated amortization $ 19,959 17,762
Customer and Referral Relationships [Member] | Minimum [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated useful life 6 years  
Customer and Referral Relationships [Member] | Maximum [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated useful life 14 years  
Non-compete Agreements [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total $ 2,014 1,949
Accumulated amortization $ 6,597 $ 6,450
Non-compete Agreements [Member] | Minimum [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated useful life 5 years  
Non-compete Agreements [Member] | Maximum [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated useful life 6 years