Reinsurance (Schedule of reconciliation of direct to net losses and loss adjustment expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reinsurance Disclosures [Abstract]
Direct losses and loss adjustment expenses	$ 41,121	$ 36,093	$ 59,758	$ 55,735
Assumed losses and loss adjustment expenses	487	2,024	1,076	2,613
Ceded losses and loss adjustment expenses	(887)	(1,887)	(1,264)	(4,397)
Net losses and loss adjustment expenses	$ 40,721	$ 36,230	$ 59,570	$ 53,951