Discontinued Operations - Components of Income from Discontinued Operations - Tabular Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Discontinued Operations
Gain on sale			$ (16,713)
MCC Business | Discontinued Operations, Disposed of by Sale
Discontinued Operations
Managed care and other revenue		$ 744,741		$ 2,200,132
Cost of care		615,390		1,791,298
Direct service costs and other operating expenses	$ 354	89,282	1,555	265,857
Depreciation and amortization		5,380		16,085
Interest expense				89
Interest and other income		(901)		(4,919)
Gain on sale	(8,713)		(16,713)
Total costs and expenses	(8,359)	709,151	(15,158)	2,068,410
Income from discontinued operation before income taxes	8,359	35,590	15,158	131,722
Provision for income taxes	2,309	6,647	3,993	47,062
Net income from discontinued operations	$ 6,050	$ 28,943	11,165	$ 84,660
MCC Business | Discontinued Operations, Held-for-sale
Discontinued Operations
Gain on sale			$ (16,700)