Intangible Assets, Net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (85,748)	$ (73,517)
Total	90,781
Intangible Assets, Gross	176,529	176,529
Intangible Assets, Net	90,781	103,012
Network relationships
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, Gross	143,930	143,930
Accumulated Amortization	(70,200)	(60,526)
Total	$ 73,730	$ 83,404
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	(11,225)	(9,676)
Total	$ 11,607	$ 13,156
Member relationships
Finite-Lived Intangible Assets [Line Items]
Useful Life	12 years	12 years
Amortized intangible assets, Gross	$ 6,696	$ 6,696
Accumulated Amortization	(3,013)	(2,352)
Total	$ 3,683	$ 4,344
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	(1,167)	(858)
Total	$ 893	$ 1,202
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	(143)	(105)
Total	$ 868	$ 906