Short Duration Contracts (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Short Duration Contracts [Abstract]
Liability for Claims and Claims Adjustment Expense	$ 454	$ 534	$ 543	$ 514
Reinsurance Recoverables, Including Reinsurance Premium Paid	0	0	0	0
Liability for Unpaid Claims and Claims Adjustment Expense, Net	454	534	$ 543	$ 514
Current Year Claims and Claims Adjustment Expense	1,435	1,642
Prior Year Claims and Claims Adjustment Expense	(11)	(110)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	1,424	1,532
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	1,106	1,243
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	407	269
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	$ 1,513	$ 1,512