Loss and Loss Adjustment Expense Reserves (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Loss and Loss Adjustment Expense Reserves
Reserves for losses and LAE at beginning of year	$ 610,566	$ 584,719
Less receivable from reinsurers related to unpaid losses and LAE	(122,372)	(108,398)
Net reserves for losses and LAE at beginning of year	488,194	476,321
Incurred losses and LAE, related to:
Current year	231,048	270,757
Prior years	(19,328)	(22,337)
Total incurred losses and LAE	211,720	248,420
Paid losses and LAE related to:
Current year	105,043	139,220
Prior years	111,502	108,626
Total paid losses and LAE	216,545	247,846
Net reserves for losses and LAE at end of period	483,369	476,895
Plus receivable from reinsurers related to unpaid losses and LAE	116,378	112,228	$ 122,372
Reserves for losses and LAE at end of period	599,747	589,123
Prior years	$ 19,328	$ 22,337