Discontinued Operations - Components of Income from Discontinued Operations - Tabular Disclosure (Details) - MCC Business - Discontinued Operations, Held-for-sale - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Discontinued Operations
Managed care and other revenue	$ 744,741	$ 713,089	$ 2,200,132	$ 2,045,474
Cost of care	615,390	615,309	1,791,298	1,781,148
Direct service costs and other operating expenses	89,282	71,473	265,857	213,064
Depreciation and amortization	5,380	5,267	16,085	15,857
Interest expense		72	89	213
Interest and other income	(901)	(3,271)	(4,919)	(9,686)
Total costs and expenses	(709,151)	(688,850)	(2,068,410)	(2,000,596)
Income from discontinued operation before income taxes	35,590	24,239	131,722	44,878
Provision for income taxes	6,647	7,086	47,062	12,705
Net income from discontinued operations	$ 28,943	$ 17,153	$ 84,660	$ 32,173