Loss and Loss Adjustment Expense Reserves (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 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	130,330	138,007
Prior years	(9,584)	(11,980)
Total incurred losses and LAE	120,746	126,027
Paid losses and LAE related to:
Current year	48,745	58,796
Prior years	72,839	70,990
Total paid losses and LAE	121,584	129,786
Net reserves for losses and LAE at end of period	487,356	472,562
Plus receivable from reinsurers related to unpaid losses and LAE	121,337	109,200	$ 122,372
Reserves for losses and LAE at end of period	608,693	581,762
Prior years	$ 9,584	$ 11,980