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, 2022	Mar. 31, 2021
Reserves for Unpaid Losses and Loss Adjustment Expenses [Abstract]
Balance Beginning	$ 816,681	$ 789,768
Less reinsurance recoverable	387,915	357,200
Net balance ending	428,766	432,568
Incurred related to:
Current year	56,333	71,565
Prior years	7,691	(2,086)
Total incurred	64,024	69,479
Paid related to:
Current year	12,757	7,067
Prior years	62,213	52,360
Total paid	74,970	59,427
Net balance at March 31	417,820	442,620
Plus reinsurance recoverable	380,518	369,652
Balance at March 31	$ 798,338	$ 812,272