Short Duration Contracts (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Short Duration Contracts [Abstract]
Liability for Claims and Claims Adjustment Expense	$ 362	$ 454	$ 570	$ 543
Reinsurance Recoverables, Including Reinsurance Premium Paid	0	0	0	0
Liability for Unpaid Claims and Claims Adjustment Expense, Net	362	454	$ 570	$ 543
Current Year Claims and Claims Adjustment Expense	1,441	1,435
Prior Year Claims and Claims Adjustment Expense	(176)	(11)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	1,265	1,424
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	1,163	1,106
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	310	407
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	$ 1,473	$ 1,513