Medical Liabilities - Schedule of Medical Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Medical Liabilities [Roll Forward]
Medical liabilities, beginning of period	$ 58,725	$ 33,642
Components of medical care costs related to claims incurred:
Current period	229,194	175,598
Prior periods	1,731	2,875
Total medical care costs	230,925	178,473
Payments for medical care costs related to claims incurred:
Current period	(178,796)	(135,580)
Prior periods	(53,231)	(49,164)
Total paid	(232,027)	(184,744)
Acquired (see Note 3)	0	26,404
Adjustments	(168)	45
Medical liabilities, end of period	$ 57,455	$ 53,820

Medical Care Costs [Abstract]

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Payments For Medical Care Costs [Abstract]

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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 of increase (decrease) in the cost of settling unpaid claims after deduction of reinsurance recoveries related to the acquisition of a business. Includes, but is not limited to, claims which have been incurred but not reported.

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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 increase (decrease) in the liability for unpaid claims and claims adjustment expense.

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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 for claims incurred in the current reporting period and related claims settlement costs.

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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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