Reserves for Unpaid Losses and Loss Adjustment Expenses (Activity in the Reserves for Unpaid Losses and Loss Adjustment Expense) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Beginning balance	$ 880,869	$ 816,681
Less reinsurance recoverable	420,693	387,915
Net balance beginning	460,176	428,766
Incurred related to:
Prior years	15,179	75,833
Total incurred	104,186	256,342
Paid related to:
Total paid	225,674	200,608
Net ending balance	338,688	484,500
Plus reinsurance recoverable	381,299	374,388
Ending balance	719,987	858,888
Continuing Operations
Incurred related to:
Current year	90,810	85,335
Prior years	15,179	75,833
Total incurred	105,989	161,168
Paid related to:
Current year	35,916	41,816
Prior years	112,080	79,948
Total paid	147,996	121,764
Discontinued Operations
Incurred related to:
Current year	2,254	82,829
Prior years	(4,057)	12,345
Total incurred	(1,803)	95,174
Paid related to:
Current year	4,669	13,738
Prior years	73,009	65,106
Total paid	$ 77,678	$ 78,844