Reserves for Unpaid Losses and Loss Adjustment Expenses (Activity in the Reserves for Unpaid Losses and Loss Adjustment Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 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	3,555	10,421
Total incurred	29,418	64,024
Paid related to:
Total paid	81,299	74,970
Net ending balance	408,295	417,820
Plus reinsurance recoverable	427,608	380,518
Ending balance	835,903	798,338
Continuing Operations
Incurred related to:
Current year	26,209	28,961
Prior years	3,555	10,421
Total incurred	29,764	39,382
Paid related to:
Current year	7,718	8,730
Prior years	40,137	37,114
Total paid	47,855	45,844
Discontinued Operations
Incurred related to:
Current year	(219)	27,372
Prior years	(127)	(2,730)
Total incurred	(346)	24,642
Paid related to:
Current year	1,330	4,027
Prior years	32,114	25,099
Total paid	$ 33,444	$ 29,126