Liability for Unpaid Claims and Claim Adjustment Expenses Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Prior Year Claims and Claims Adjustment Expense	$ 3,347	$ 1,599
Non-Standard Auto
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Reported Claims, Amount	2,345	1,940
Warranty
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Reported Claims, Amount	$ 1,466	$ 1,436