Discontinued Operations - Components of Income from Discontinued Operations - Tabular Disclosure (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Discontinued Operations
Gain on sale of MCC	$ (348,145)
Discontinued Operations, Held-for-sale
Discontinued Operations
Managed care and other revenue		$ 2,757,511
Cost of care		2,397,007
Direct service costs and other operating expenses		292,351
Depreciation and amortization		21,142
Interest expense		285
Interest and other income		(12,332)
Total costs and expenses		2,698,453
Income from discontinued operation before income taxes		59,058
Provision for income taxes		15,753
Net income from discontinued operations		$ 43,305
MCC Business | Discontinued Operations, Disposed of by Sale
Discontinued Operations
Managed care and other revenue	2,924,014
Cost of care	2,377,847
Direct service costs and other operating expenses	360,783
Depreciation and amortization	20,358
Interest expense	89
Interest and other income	(5,464)
Gain on sale of MCC	(348,145)
Total costs and expenses	2,405,468
Income from discontinued operation before income taxes	518,546
Provision for income taxes	140,257
Net income from discontinued operations	$ 378,289
MCC Business | Discontinued Operations, Held-for-sale
Discontinued Operations
Managed care and other revenue			$ 2,529,386
Cost of care			2,207,721
Direct service costs and other operating expenses			300,696
Depreciation and amortization			20,376
Interest expense			216
Interest and other income			(9,184)
Total costs and expenses			2,519,825
Income from discontinued operation before income taxes			9,561
Provision for income taxes			7,556
Net income from discontinued operations			$ 2,005