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Intangible Assets, net - Amortization of Referral Relationships and Non-Competition Agreements (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Referral Relationships [Member]  
Finite-Lived Intangible Assets, Amortization Expense, Maturity [Abstract]  
2020 $ 2,403
2021 2,403
2022 2,354
2023 2,247
2024 2,082
Thereafter 6,878
Non-compete Agreements [Member]  
Finite-Lived Intangible Assets, Amortization Expense, Maturity [Abstract]  
2020 619
2021 541
2022 364
2023 294
2024 238
Thereafter $ 116