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Reserves for Claims and Performance-Based Arrangements (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 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 180,675 102,664
Prior year to date period (19,914) 6,511
Total claims incurred 160,761 109,175
Claims paid related to:    
Current year to date period (64,870) (47,724)
Prior year to date period (98,424) (59,491)
Total claims paid (163,294) (107,215)
Other adjustments 0 (9,016)
Balance, end of period $ 197,197 $ 164,238