Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Premiums Written, Net [Abstract]
Direct written premiums	$ 94,885	$ 69,981	$ 179,448	$ 133,828
Assumed Premiums Written	62	0	125	0
Ceded written premiums	(12,260)	(9,090)	(23,819)	(17,846)
Net written premiums	82,687	60,891	155,754	115,982
Premiums Earned, Net [Abstract]
Direct earned premiums	77,920	59,603	149,998	116,196
Assumed Premiums Earned	16	0	73	0
Ceded earned premiums	(11,849)	(8,710)	(22,493)	(17,242)
Net earned premiums	66,087	50,893	127,578	98,954
Ceded incurred losses and loss adjustment expenses	9,400	$ 5,000	13,700	$ 7,900
Reinsurance recoverables on paid losses	3,900		3,900		$ 1,400
Reinsurance recoverables on unpaid losses	$ 62,000		$ 62,000		$ 55,400