Medical Expenses Payable - Components of Change in Medical Expenses Payable (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Insurance [Abstract]
Claims incurred but not paid - beginning balance	$ 77,073	$ 82,391
Incurred related to:
Current year	103,625	83,223
Prior years	(9,521)	(3,745)
Total incurred, net of reinsurance	94,104	79,478
Payments related to:
Current year	37,626	22,746
Prior years	48,668	57,786
Total payments, net of reinsurance	86,294	80,532
Claims incurred but not paid - ending balance	84,883	81,337
Other medical expenses payable	70,080	47,336
Total medical expenses payable	$ 154,963	$ 128,673	$ 125,886