Reserves for Claims and Performance-Based Arrangements (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance, beginning of period	$ 199,730	$ 171,294
Incurred health care costs:
Current year to date period	628,251	471,502
Prior year to date period	(36,248)	(8,154)
Total claims incurred	592,003	463,348
Claims paid related to:
Current year to date period	(364,709)	(369,708)
Prior year to date period	(127,282)	(129,236)
Total claims paid	(491,991)	(498,944)
Balance, end of period	$ 299,742	$ 135,698

The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

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Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs.

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Amount, after effects of reinsurance, of payments to settle claims incurred in prior periods and related claims settlement costs.

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Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process.

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Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.

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