Reserves for Unpaid Losses and Loss Adjustment Expenses (Activity in the Reserves for Unpaid Losses and Loss Adjustment Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Reserves for Unpaid Losses and Loss Adjustment Expenses [Abstract]
Balance at January 1	$ 527,247	$ 527,100
Less reinsurance recoverable	221,716	154,612
Net balance at January 1	305,531	372,488
Incurred related to:
Claims and Claim Adjustment Expenses Incurred Related to Current year	301,265	250,075
Claims and Claim Adjustment Expenses Incurred Related to Prior years	60,900	5,953
Total incurred	362,165	256,028
Paid related to:
Claims and Claim Adjustment Expenses Paid Related to Current year	127,610	90,640
Claims and Claim Adjustment Expenses Paid Related to Prior years	192,335	232,345
Total paid	319,945	322,985
Net balance at December 31	347,751	305,531
Plus reinsurance recoverable	272,604	221,716
Balance at December 31	$ 620,355	$ 527,247