Unpaid Loss and Loss Adjustment Expenses Property and Casualty (tables) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Unpaid loss and loss adjustment expenses	$ 2,594	$ 1,800	$ 1,329
Balance at end of period, gross	2,594	1,800
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	100	332
Balance at beginning of period, net	2,494	1,468
Current year	0	0
Prior years	(1,647)	1
Current year	0	0
Prior years	410	379
Balance at end of period, net	2,494	1,468	1,257	1,848
Plus reinsurance recoverable related to unpaid loss and loss adjustment expenses	$ 100	$ 332	$ 72	$ 354