Reserves for Losses and Loss Settlement Expenses (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross liability for losses and loss settlement expenses at beginning of year	$ 1,638,755	$ 1,497,274
Ceded losses and loss settlement expenses	(191,640)	(146,875)
Net liability for losses and loss settlement expenses at beginning of year	1,447,115	1,350,399
Losses and loss settlement expenses incurred for claims occurring during
Current year	378,121	701,664
Prior years	2,850	67,750
Total incurred	380,971	769,414
Losses and loss settlement expense payments for claims occurring during
Current year	61,548	191,899
Prior years	216,453	480,800
Total paid	278,001	672,699
Net liability for losses and loss settlement expenses at end of period	1,550,085	1,447,115
Ceded losses and loss settlement expenses	205,654	191,640
Gross liability for losses and loss settlement expenses at end of period	$ 1,755,739	$ 1,638,755