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Intangible Assets, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets, Net [Abstract]    
Total $ 56,280 $ 52,588
Tradenames [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total $ 32,317 32,049
Estimated useful life 6 years  
Referral Relationships [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total $ 22,119 18,367
Accumulated amortization $ 14,522 11,677
Referral Relationships [Member] | Minimum [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated useful life 6 years  
Referral Relationships [Member] | Maximum [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Estimated useful life 16 years  
Non-compete Agreements [Member]    
Finite-Lived Intangible Assets, Net [Abstract]    
Total $ 1,844 2,172
Accumulated amortization $ 5,993 $ 5,424
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