Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2025 USD ($) insurance_company	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares
Accounting Policies [Line Items]
Premiums receivable and agents’ balances, net	$ 153,638,000	$ 243,882,000
Allowance for credit losses	19,700,000	22,300,000
Credit loss expense	442,000	6,900,000	$ 2,800,000
Allowance for credit losses written off	3,000,000.0	2,500,000	1,200,000
Allowance for credit losses on reinsurance recoverables	1,600,000	1,200,000	660,000
Fee income	2,416,000	4,585,000	5,301,000
Deferred tax assets, valuation allowance	0	0
Investment in variable interest entities	7,300,000	7,700,000
Excess and Surplus Lines
Accounting Policies [Line Items]
Broker incentive income	3,300,000	5,400,000	1,300,000
Specialty Admitted Insurance
Accounting Policies [Line Items]
Fee income	$ 2,400,000	$ 4,600,000	$ 5,300,000
Stock Options, Restricted Stock Units and Convertible Preferred Stock
Accounting Policies [Line Items]
Number of securities excluded from the calculations of diluted (loss) earnings per share (in shares) | shares		7,886,906	5,722,915
Minimum
Accounting Policies [Line Items]
Intangible assets, useful life (in years)	7 years
Property and equipment, estimated useful lives (in years)	3 years
Maximum
Accounting Policies [Line Items]
Intangible assets, useful life (in years)	27 years 6 months
Property and equipment, estimated useful lives (in years)	10 years
Receivables greater than 90 days past due
Accounting Policies [Line Items]
Premiums receivable and agents’ balances, net	$ 17,000,000.0	$ 16,400,000
United States
Accounting Policies [Line Items]
Number of insurance companies | insurance_company	5