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Transactions - Passport (Details) - USD ($) $ in Thousands						1 Months Ended	3 Months Ended	9 Months Ended
	Dec. 31, 2020	Nov. 16, 2020	Sep. 01, 2020	Jun. 06, 2019	May 28, 2019	Jan. 31, 2021	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 30, 2019	Jun. 18, 2019
Business Acquisition [Line Items]
Payments to redeem Sponsors' equity								$ 1,300	$ 0
Passport Asset Acquisition
Business Acquisition [Line Items]
Cash and equivalents			$ 159,800
Debt securities, available-for-sale			88,600
Receivables related to unsettled sales of securities			43,000
Other assets			50,200
Accrued medical expenses			164,800
Accrued liabilities			50,000
Molina
Business Acquisition [Line Items]
Asset Purchase Agreement, escrow payments			$ 20,000
Cash released from escrow						$ 20,000
Passport Note
Business Acquisition [Line Items]
Interest rate											6.50%
Proceeds from collection of notes receivable	$ 40,000
Proceeds from interest received	$ 3,600
Passport Note | Notes Receivable
Business Acquisition [Line Items]
Notes receivable, net											$ 40,000
Passport | Variable Interest Entity, Not Primary Beneficiary
Business Acquisition [Line Items]
Payments to acquire interest					$ 70,000
Interest in investment		30.00%	30.00%		30.00%
Performance bond amount				$ 25,000
Payments to acquire equity method investments, amount held back										$ 16,200
Payments to redeem Sponsors' equity		$ 20,000
Proceeds from transfer of membership							$ 23,000
Transfer of membership, percentage of payment based on number of enrollees							50.00%
Transfer of membership, percentage of payment subject to satisfaction of contingencies								50.00%

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