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Insurance Contracts (Tables)
 9 Months Ended
Sep. 30, 2025
Insurance [Line Items]  
Schedule of Loss And Loss Expense Reserves And Subrogation Recoverable Table [Table Text Block]
Premium Receivable, Allowance for Credit Loss [Table Text Block]
Nine Months Ended September 30,20252024
Beginning balance$142 $— 
Current period provision58 142 
Write-offs of the allowance— — 
Recoveries of previously written-off amounts— — 
Ending balance$200 $142 
At September 30, 2025, and December 31, 2024, $9,445 and $5,690 of premiums were past due.
Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance
Below is the loss and loss reserve expense roll-forward, net of subrogation recoverable and reinsurance, for the affected periods:
Nine Months Ended September 30,20252024
Beginning gross loss and loss expense reserves$349,062 $197,089 
Reinsurance recoverable270,081 156,301 
Beginning balance of net loss and loss expense reserves78,981 40,788 
Losses and loss expenses:
Current year31,577 59,742 
Prior years4,283 3,058 
Total (1)
35,860 62,800 
Loss and loss expenses paid (recovered):
Current year4,263 9,572 
Prior years27,814 13,585 
Total32,077 23,157 
Ending net loss and loss expense reserves 82,764 80,431 
Reinsurance recoverable (2)
354,775 242,800 
Ending gross loss and loss expense reserves$437,539 $323,231 
(1)Total losses and loss adjustment expense (benefit) is net of $(166,959) and $(72,160) for the nine months ended September 30, 2025 and 2024, respectively, related to ceded reinsurance.
(2)Represents reinsurance recoverable on future loss and loss expenses. Additionally, the Balance Sheet line "Reinsurance recoverable on paid and unpaid losses" includes reinsurance recoverables (payables) of $85,687 and $41,225 as of September 30, 2025, and 2024, respectively, related to previously paid loss and loss expenses
Prior accident years losses incurred development for the nine months ended September 30, 2025, was primarily driven by increased commercial auto loss experience for programs in run-off and excess liability claims, whereas prior accident years losses incurred development for the nine months ended September 30, 2024, was primarily driven by increased commercial auto loss experience for programs in run-off.
Effects of Reinsurance
The effect of reinsurance on premiums written and earned was as follows:
Three Months Ended September 30,
20252024
WrittenEarnedWrittenEarned
Direct$89,780 $83,058 $92,776 $79,847 
Assumed7,405 8,053 22,378 16,999 
Ceded79,408 74,084 82,400 69,405 
Net premiums
$17,777 $17,027 $32,754 $27,441 
Nine Months Ended September 30,
20252024
WrittenEarnedWrittenEarned
Direct$256,820 $243,104 $262,726 $211,820 
Assumed23,527 22,556 60,057 49,804 
Ceded229,360 216,752 231,493 181,550 
Net premiums$50,987 $48,908 $91,290 $80,074 
Reinsurance Recoverable, Credit Quality Indicator The following table sets forth our five most significant reinsurers by amount of reinsurance recoverable as of September 30, 2025.
Reinsurers
Rating
 (1)
Reinsurance
Recoverable
(2)
Unsecured
Recoverable
(3)
General Reinsurance CompanyA++$148,776 $130,515 
Munich Reinsurance CompanyA+49,677 32,540 
QBE Insurance CorporationA27,255 27,255 
Guaranty Captive Insurance CompanyNR21,937 — 
Swiss Reinsurance America CorporationA+17,486 15,890 
All other reinsurers
175,331 98,083 
Total recoverables
$440,462 $304,283 
(1)Represents financial strength ratings from AM Best for P&C reinsurers.
(2)Represents reinsurance recoverables on paid and unpaid losses. Unsecured amounts from QBE Insurance Corporation are also supported by an unlimited, uncapped indemnity from Enstar Holdings (US).
(3)Reinsurance recoverables reduced by ceded premiums payables due to reinsurers, letters of credit, and collateral posted for the benefit of Ambac.