Short Duration Contracts (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Short Duration Contracts [Abstract]
Liability for Claims and Claims Adjustment Expense	$ 389	$ 444	$ 570	$ 543
Reinsurance Recoverables, Including Reinsurance Premium Paid	0	0	0	0
Liability for Unpaid Claims and Claims Adjustment Expense, Net	389	444	$ 570	$ 543
Current Year Claims and Claims Adjustment Expense	977	1,046
Prior Year Claims and Claims Adjustment Expense	(152)	(10)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	825	1,036
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	701	758
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	305	377
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	$ 1,006	$ 1,135