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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Net deferred tax asset    
Deferred tax assets $ 91,729 $ 29,100
Deferred tax liabilities (448,539) (402,754)
Net deferred tax liability (356,810) (373,654)
Components of the net deferred tax asset    
Contingency reserves (432,265) (372,336)
Unrealized (gain) loss on investments 60,439  
Unrealized (gain) loss on investments   (14,573)
Unearned premium reserve 14,099 12,539
Investments in limited partnerships (13,907) (13,002)
Accrued expenses 6,257 6,076
Unearned ceding commissions 2,363 2,474
Change in fair market value of derivatives 2,377 1,827
Deferred policy acquisition costs (2,152) (2,642)
Nonvested shares 1,640 1,841
Start-up expenditures, net 1,233 880
Fixed assets 1,197 836
Impairments on available-for-sale investment securities 1,155 0
Loss reserves 965 2,622
Prepaid expenses (156) (123)
Loss reserves - TCJA transition adjustment (59) (78)
Organizational expenditures 4 5
Net deferred tax liability $ (356,810) $ (373,654)