Medical Liabilities - Schedule of Medical Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Medical Liabilities [Roll Forward]
Medical liabilities, beginning of period	$ 50,330	$ 58,725
Components of medical care costs related to claims incurred:
Current period	83,329	85,928
Prior periods	(2,018)	(602)
Total medical care costs	81,311	85,326
Payments for medical care costs related to claims incurred:
Current period	(41,713)	(37,004)
Prior periods	(39,344)	(43,247)
Total paid	(81,057)	(80,251)
Adjustments	895	(102)
Medical liabilities, end of period	$ 51,479	$ 63,698