Intangible Assets, Net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (93,330)	$ (89,544)
Total	83,199
Intangible Assets, Gross	176,529	176,529
Intangible Assets, Net	83,199	86,985
Network relationships
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, Gross	143,930	143,930
Accumulated Amortization	(76,171)	(73,169)
Total	$ 67,759	$ 70,761
Network relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life	11 years	11 years
Network relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life	15 years	15 years
Management contracts
Finite-Lived Intangible Assets [Line Items]
Useful Life	15 years	15 years
Amortized intangible assets, Gross	$ 22,832	$ 22,832
Accumulated Amortization	(12,202)	(11,715)
Total	$ 10,630	$ 11,117
Member relationships
Finite-Lived Intangible Assets [Line Items]
Useful Life	12 years	12 years
Amortized intangible assets, Gross	$ 6,696	$ 6,696
Accumulated Amortization	(3,415)	(3,234)
Total	$ 3,281	$ 3,462
Patient management platform
Finite-Lived Intangible Assets [Line Items]
Useful Life	5 years	5 years
Amortized intangible assets, Gross	$ 2,060	$ 2,060
Accumulated Amortization	(1,373)	(1,270)
Total	$ 687	$ 790
Trade names/trademarks
Finite-Lived Intangible Assets [Line Items]
Useful Life	20 years	20 years
Amortized intangible assets, Gross	$ 1,011	$ 1,011
Accumulated Amortization	(169)	(156)
Total	$ 842	$ 855