Reserves for Losses and Loss Settlement Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross liability for losses and loss settlement expenses at beginning of year	$ 1,514,265	$ 1,578,131	$ 1,421,754
Ceded losses and loss settlement expenses	(112,900)	(131,843)	(68,536)
Net liability for losses and loss settlement expenses at beginning of year	1,401,365	1,446,288	1,353,218
Losses and loss settlement expenses incurred for claims occurring during
Current year	624,411	701,064	887,119
Prior years	12,890	(48,909)	(17,652)
Total incurred	637,301	652,155	869,467
Losses and loss settlement expense payments for claims occurring during
Current year	215,891	277,115	354,635
Prior years	472,377	419,963	421,762
Total paid	688,268	697,078	776,397
Net liability for losses and loss settlement expenses at end of year	1,350,399	1,401,365	1,446,288
Ceded losses and loss settlement expenses	146,875	112,900	131,843
Gross liability for losses and loss settlement expenses at end of year	$ 1,497,274	$ 1,514,265	$ 1,578,131