Insurance Contracts (Details) $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Insurance [Line Items]
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	$ 78,981
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	270,081	$ 156,301	$ 80,155	$ 31,695
Liability for Claims and Claims Adjustment Expense	349,062	197,089
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	15,702
Commercial Auto | Operating Segments
Insurance [Line Items]
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	129,752
Liability for Claims and Claims Adjustment Expense	158,472
Unallocated Loss Adjustment Expense Reserve | Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment
Insurance [Line Items]
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	5,660
Liability for Claims and Claims Adjustment Expense	12,238
Other Insurance Contracts | Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment
Insurance [Line Items]
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	63,563
Liability for Claims and Claims Adjustment Expense	65,739
Excess and General Liability | Operating Segments
Insurance [Line Items]
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	70,602
Liability for Claims and Claims Adjustment Expense	85,459
Workers' Compensation Insurance | Operating Segments
Insurance [Line Items]
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	0
Liability for Claims and Claims Adjustment Expense	14,465
Non-standard Personal Auto | Operating Segments
Insurance [Line Items]
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	504
Liability for Claims and Claims Adjustment Expense	12,689
Specialty Property & Casualty Program
Insurance [Line Items]
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	270,081
Specialty Property & Casualty Program | Operating Segments
Insurance [Line Items]
Liability for Claims and Claims Adjustment Expense	349,062
Specialty Property & Casualty Program | Commercial Auto
Insurance [Line Items]
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	28,720
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	48,567
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	19,847
Short Duration Insurance Contract Liability For Unpaid Clams and Allocated Claim Adjustment Expense Subtotal For Separately Presented	$ 28,720	0
Short-Duration Insurance Contracts, Historical Claims Duration, Year Four	55.10%
Specialty Property & Casualty Program | Commercial Auto | Short-Duration Insurance Contract, Accident Year 2021
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 962	978	468	432
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	681	151	44	7
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 150
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	80
Specialty Property & Casualty Program | Commercial Auto | Short-Duration Insurance Contract, Accident Year 2022
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 9,099	7,866	8,225
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	4,700	2,325	555
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 1,959
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	1,155
Specialty Property & Casualty Program | Commercial Auto | Short-Duration Insurance Contract, Accident Year 2023
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 23,313	19,459
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	10,989	3,914
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 6,496
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	3,197
Specialty Property & Casualty Program | Commercial Auto | Short-Duration Insurance Contract, Accident Year 2024
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 15,193
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	3,477
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 7,583
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	2,768
Specialty Property & Casualty Program | Commercial Auto | Operating Segments
Insurance [Line Items]
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	$ 28,720
Specialty Property & Casualty Program | Unallocated Loss Adjustment Expense Reserve | Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment
Insurance [Line Items]
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	6,578
Specialty Property & Casualty Program | Other Insurance Contracts | Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment
Insurance [Line Items]
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	2,176
Specialty Property & Casualty Program | Excess and General Liability
Insurance [Line Items]
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	14,857
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	845
Short Duration Insurance Contract Liability For Unpaid Clams and Allocated Claim Adjustment Expense Subtotal For Separately Presented	$ 14,857
Short-Duration Insurance Contracts, Historical Claims Duration, Year One	0.60%
Short-Duration Insurance Contracts, Historical Claims Duration, Year Two	3.70%
Short-Duration Insurance Contracts, Historical Claims Duration, Year Three	31.30%
Short-Duration Insurance Contracts, Historical Claims Duration, Year Four	0.00%
Specialty Property & Casualty Program | Excess and General Liability | Short-Duration Insurance Contract, Accident Year 2021
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 12	10	3	3
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	0		0	0
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 2
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	1
Specialty Property & Casualty Program | Excess and General Liability | Short-Duration Insurance Contract, Accident Year 2022
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 589	350	372
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	368		1
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 227
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	6
Specialty Property & Casualty Program | Excess and General Liability | Short-Duration Insurance Contract, Accident Year 2023
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 2,901	3,597
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	316	30
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 2,434
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	69
Specialty Property & Casualty Program | Excess and General Liability | Short-Duration Insurance Contract, Accident Year 2024
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 12,200
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	161
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 10,877
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	177
Specialty Property & Casualty Program | Excess and General Liability | Operating Segments
Insurance [Line Items]
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	$ 14,857
Specialty Property & Casualty Program | Workers' Compensation Insurance
Insurance [Line Items]
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	14,465
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	22,542
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	8,077
Short Duration Insurance Contract Liability For Unpaid Clams and Allocated Claim Adjustment Expense Subtotal For Separately Presented	$ 14,465	0
Short-Duration Insurance Contracts, Historical Claims Duration, Year One	11.60%
Short-Duration Insurance Contracts, Historical Claims Duration, Year Two	17.90%
Short-Duration Insurance Contracts, Historical Claims Duration, Year Three	18.60%
Short-Duration Insurance Contracts, Historical Claims Duration, Year Four	0.00%
Specialty Property & Casualty Program | Workers' Compensation Insurance | Short-Duration Insurance Contract, Accident Year 2021
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 0	0	0	0
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	0	0	0	0
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	0
Specialty Property & Casualty Program | Workers' Compensation Insurance | Short-Duration Insurance Contract, Accident Year 2022
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 0	0	0
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	0	0	0
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	0
Specialty Property & Casualty Program | Workers' Compensation Insurance | Short-Duration Insurance Contract, Accident Year 2023
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 6,056	6,053
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	3,938	807
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ (331)
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	2,308
Specialty Property & Casualty Program | Workers' Compensation Insurance | Short-Duration Insurance Contract, Accident Year 2024
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 16,486
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	4,139
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 8,156
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	3,177
Specialty Property & Casualty Program | Workers' Compensation Insurance | Operating Segments
Insurance [Line Items]
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	$ 14,465
Specialty Property & Casualty Program | Non-standard Personal Auto | Operating Segments
Insurance [Line Items]
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	12,185
Specialty Property & Casualty Program | Insurance, Other
Insurance [Line Items]
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	14,361
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	29,404
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	15,043
Short Duration Insurance Contract Liability For Unpaid Clams and Allocated Claim Adjustment Expense Subtotal For Separately Presented	$ 14,361	0
Short-Duration Insurance Contracts, Historical Claims Duration, Year One	20.60%
Short-Duration Insurance Contracts, Historical Claims Duration, Year Two	35.80%
Short-Duration Insurance Contracts, Historical Claims Duration, Year Three	0.00%
Short-Duration Insurance Contracts, Historical Claims Duration, Year Four	0.00%
Specialty Property & Casualty Program | Insurance, Other | Short-Duration Insurance Contract, Accident Year 2021
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 0	0	0	0
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	0	0	0	$ 0
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 0
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	0
Specialty Property & Casualty Program | Insurance, Other | Short-Duration Insurance Contract, Accident Year 2022
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 1	1	1
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	0	0	$ 0
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 1
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	740
Specialty Property & Casualty Program | Insurance, Other | Short-Duration Insurance Contract, Accident Year 2023
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 6,062	6,142
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	4,337	$ 966
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 539
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	17,633
Specialty Property & Casualty Program | Insurance, Other | Short-Duration Insurance Contract, Accident Year 2024
Insurance [Line Items]
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 23,341
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net	10,706
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 3,469
Short-Duration Insurance Contract, Cumulative Number of Reported Claims	52,385