Medical Liabilities - Schedule of Medical Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Medical Liabilities [Roll Forward]
Medical liabilities, beginning of year	$ 58,725	$ 33,642
Acquired (see Note 3)	0	27,474
Components of medical care costs related to claims incurred:
Current period	309,848	271,987
Prior periods	(3,258)	2,684
Total medical care costs	306,590	274,671
Payments for medical care costs related to claims incurred:
Current period	(261,062)	(218,564)
Prior periods	(54,056)	(58,633)
Total paid	(315,118)	(277,197)
Adjustments	133	135
Medical liabilities, end of year	$ 50,330	$ 58,725