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Retroactive Insurance Contracts (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Net premiums earned	$ 272,248		$ 194,559	$ 698,598	$ 605,708
Net losses and loss adjustment expenses				$ 582,235	$ 555,969	$ 711,846
Retroactive Insurance Contract
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Net premiums written		$ 4,500
Net premiums earned		3,000
Net losses and loss adjustment expenses		2,900
Prospective coverage for retroactive insurance contract
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Net premiums written		2,200
Net premiums earned		700
Retroactive coverage for retroactive insurance contract
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Net premiums written		2,300
Net premiums earned		$ 2,300

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

+ References

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-Publisher FASB
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-SubTopic 220
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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written.

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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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