Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Premiums Written, Net [Abstract]
Direct written premiums	$ 84,563	$ 63,847
Assumed Premiums Written	63	0
Ceded written premiums	(11,559)	(8,756)
Net written premiums	73,067	55,091
Premiums Earned, Net [Abstract]
Direct earned premiums	72,078	56,593
Assumed Premiums Earned	57	0
Ceded earned premiums	(10,644)	(8,532)
Net earned premiums	61,491	48,061
Ceded incurred losses and loss adjustment expenses	4,300	$ 2,900
Reinsurance recoverables on paid losses	1,700		$ 1,400
Reinsurance recoverables on unpaid losses	$ 57,600		$ 55,400