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Intangible Assets, net - Amortization of Referral Relationships and Non-Competition Agreements (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Referral Relationships [Member]  
Finite-Lived Intangible Assets, Amortization Expense, Maturity [Abstract]  
2021 $ 2,946
2022 2,886
2023 2,778
2024 2,615
2025 2,470
Thereafter 8,424
Non-compete Agreements [Member]  
Finite-Lived Intangible Assets, Amortization Expense, Maturity [Abstract]  
2021 556
2022 403
2023 335
2024 279
2025 212
Thereafter $ 59