Income Taxes (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	May 05, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Income Tax Contingency [Line Items]
Gain on bargain purchase		$ 74,408	$ 0	$ 74,408	$ 0
Income taxes receivable		10,500		10,500		$ 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		45,300		45,300
Income tax refund, CARES Act		15,900		15,900
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