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INTANGIBLE ASSETS, NET - Amortization of Referral Relationships and Non-Competition Agreements (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Referral Relationships [Member]  
Finite-Lived Intangible Assets, Amortization Expense, Maturity [Abstract]  
2019 $ 2,132
2020 2,132
2021 2,132
2022 2,084
2023 1,977
2024 1,791
Thereafter 4,646
Non-compete Agreements [Member]  
Finite-Lived Intangible Assets, Amortization Expense, Maturity [Abstract]  
2019 632
2020 418
2021 340
2022 163
2023 94
2024 $ 30