Reserves for Losses and Loss Settlement Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross liability for losses and loss settlement expenses at beginning of year	$ 1,497,274	$ 1,514,265	$ 1,578,131
Ceded losses and loss settlement expenses	(146,875)	(112,900)	(131,843)
Net liability for losses and loss settlement expenses at beginning of year	1,350,399	1,401,365	1,446,288
Losses and loss settlement expenses incurred for claims occurring during
Current year	701,664	624,411	701,064
Prior years	67,750	12,890	(48,909)
Total incurred	769,414	637,301	652,155
Losses and loss settlement expense payments for claims occurring during
Current year	191,899	215,891	277,115
Prior years	480,800	472,377	419,963
Total paid	672,699	688,268	697,078
Net liability for losses and loss settlement expenses at end of year	1,447,115	1,350,399	1,401,365
Ceded losses and loss settlement expenses	191,640	146,875	112,900
Gross liability for losses and loss settlement expenses at end of year	$ 1,638,755	$ 1,497,274	$ 1,514,265