Liability for Unpaid Claims and Claim Adjustment Expenses Reconciliation of Short Duration Contracts to Total Losses Incurred (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Insurance [Abstract]
Total incurred	$ 28,844	$ 25,209	$ 60,812	$ 53,897
Other lines incurred	77	(1)	123	(3)
Unallocated loss adjustment expense	623	432	1,321	901
Net	$ 29,544	$ 25,640	$ 62,256	$ 54,795