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Income Taxes (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	May 05, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Contingency [Line Items]
Gain on bargain purchase		$ 0	$ 0	$ 74,408	$ 0
Goodwill impairment		0	161,115	0	$ 161,115	$ 161,115
Non-deductible goodwill impairment loss			149,600
Deductible goodwill impairment losses			$ 11,500
Income taxes receivable		6,700		6,700		18,900
Unrecognized tax benefits		5,800		5,800		5,700
Accrued liability for interest related to unrecognized tax benefits		600		600		$ 500
Tax Year 2020
Income Tax Contingency [Line Items]
Operating loss carryforwards		33,300		33,300
Income tax refund, CARES Act		11,700		11,700
Tax Year 2019
Income Tax Contingency [Line Items]
Operating loss carryforwards		25,600		25,600
Income tax refund, CARES Act		9,000		9,000
NORCAL Group
Income Tax Contingency [Line Items]
Gain on bargain purchase	$ 74,408
Deferred tax asset, net	$ 46,759
Operating loss carryforwards		$ 68,000		$ 68,000

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