Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Premiums Written, Net [Abstract]
Premiums written - direct	$ 97,984	$ 69,546	$ 277,432	$ 203,374
Premiums written - assumed	0	0	125	0
Premiums written - ceded	(11,232)	(11,602)	(35,051)	(29,448)
Net written premiums	86,752	57,944	242,506	173,926
Premiums Earned, Net [Abstract]
Premiums earned - direct	84,790	64,713	234,788	180,909
Premiums earned - assumed	16	0	89	0
Premiums earned - ceded	(12,185)	(10,417)	(34,678)	(27,659)
Net earned premiums	72,621	54,296	200,199	153,250
Ceded incurred losses and loss adjustment expenses	4,900	$ 15,100	18,600	$ 23,000
Reinsurance recoverables on paid losses	1,600		1,600		$ 1,400
Reinsurance recoverables on unpaid losses	$ 63,700		$ 63,700		$ 55,400