Reinsurance, Effects of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Written [Abstract]
Direct	$ 275,538	$ 223,191	$ 188,440
Assumed	0	0	38
Ceded	(39,924)	(33,719)	(21,214)
Net written premiums	235,614	189,472	167,264
Earned [Abstract]
Direct	250,397	209,426	180,794
Assumed	0	0	53
Ceded	(37,709)	(33,373)	(47,031)
Net earned premiums	212,688	176,053	133,816
Ceded incurred losses and loss adjustment expenses	$ 25,500	$ 12,200	$ 13,700