Unpaid Loss and Loss Adjustment Expenses Property and Casualty (tables) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Unpaid loss and loss adjustment expenses	$ 2,292	$ 1,494	$ 1,329
Balance at end of period, gross	2,292	1,494
Property, Liability and Casualty Insurance Product Line [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Unpaid loss and loss adjustment expenses			1,329	$ 2,202
Less reinsurance recoverable related to unpaid loss and loss adjustment expenses	79	55
Balance at beginning of period, net	2,213	1,439
Current year	0	0
Prior years	(1,628)	(266)
Current year	0	0
Prior years	672	675
Balance at end of period, net	2,213	1,439	1,257	1,848
Plus reinsurance recoverable related to unpaid loss and loss adjustment expenses	$ 79	$ 55	$ 72	$ 354