Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Net deferred tax asset
Deferred tax assets	$ 75,864	$ 91,729
Deferred tax liabilities	(438,617)	(448,539)
Net deferred tax liability	(362,753)	(356,810)
Components of the net deferred tax asset
Contingency reserves	(425,360)	(432,265)
Unrealized (gain) loss on investments	45,226	60,439
Unearned premium reserve	11,978	14,099
Investments in limited partnerships	(11,258)	(13,907)
Accrued expenses	6,404	6,257
Fixed assets	4,433	1,197
Unearned ceding commissions	2,066	2,363
Change in fair market value of derivatives	1,972	2,377
Deferred policy acquisition costs	(1,779)	(2,152)
Nonvested shares	1,938	1,640
Loss reserves	1,033	965
Start-up expenditures, net	884	1,233
Impairments on available-for-sale investment securities	38	1,155
Prepaid expenses	(220)	(156)
Other	(108)	(55)
Net deferred tax liability	$ (362,753)	$ (356,810)

Deferred Tax Assets, Deferred Expense, Unearned Ceding Commissions

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Amount of deferred tax liability attributable to taxable temporary differences from contingency reserves.

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the unearned premiums reserve.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from unrealized loss on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amount of deferred tax liability attributable to taxable temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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Amount of deferred tax liability attributable to taxable temporary differences classified as other.

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Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses.

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