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Supplemental Financial Statement Information - Summary of Rollforward of Insurance Reserve (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Insurance Reserves
Balance at beginning of period	$ 1,068,628	$ 987,064
Reinsurance recoverable at beginning of period	(245,179)	0
Additions related to:
Reserves for current period	55,110	64,468
Change in estimates for prior periods	0	128,045
Losses paid	(102,830)	(121,161)
Transfer of certain legacy auto insurance liabilities	0	0
Net balance at the end of the period	775,729	1,058,416
Add: Reinsurance recoverable at the end of the period	290,152	0
Balance at end of period	$ 1,065,881	$ 1,058,416

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Additions To Insurance Reserve

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Change in estimates for prior periods.

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Insurance Reserves Current (Net Of Reinsurance Recoverable)

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Insurance reserves during period.

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Insurance reserves losses paid.

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Insurance Reserves

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Insurance Reserves, Transfer Of Certain Legacy Auto Insurance Liabilities

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Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
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The increase (decrease) during the reporting period in the amount of benefits the ceding insurer expects to recover on insurance policies ceded to other insurance entities as of the balance sheet date for all guaranteed benefit types.

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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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