Reserves for Unpaid Losses and Loss Adjustment Expenses (Activity in the Reserves for Unpaid Losses and Loss Adjustment Expense) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 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	112,683	144,924
Prior years	63,274	1,044
Total incurred	175,957	145,968
Paid related to:
Current year	32,041	37,041
Prior years	101,888	91,689
Total paid	133,929	128,730
Net balance at June 30	470,794	449,806
Plus reinsurance recoverable	377,413	360,943
Balance at June 30	$ 848,207	$ 810,749