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Intangible Assets, net - Amortization of Referral Relationships and Non-Competition Agreements (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Tradenames [Member]  
Finite-Lived Intangible Assets [Line Items]  
2016 $ 83
2017 84
2018 83
2019 80
Referral Relationships [Member]  
Finite-Lived Intangible Assets [Line Items]  
2016 1,234
2017 1,234
2018 1,188
2019 1,099
2020 1,099
2021 1,099
2022 1,050
2023 942
2024 824
2025 716
2026 255
2027 107
2028 19
Non-compete Agreements [Member]  
Finite-Lived Intangible Assets [Line Items]  
2016 485
2017 441
2018 384
2019 312
2020 99
2021 $ 49