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Reserves for Claims and Performance-Based Arrangements (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Balance, beginning of period $ 404,048 $ 199,730
Incurred health care costs:    
Current year to date period (1) 1,117,071 628,251
Prior year to date period (25,897) (36,248)
Total claims incurred 1,091,174 592,003
Claims paid related to:    
Current year to date period (829,864) (364,709)
Prior year to date period (352,671) (127,282)
Total claims paid (1,182,535) (491,991)
Balance, end of period 312,687 $ 299,742
True-down in claims expense $ 41,700