Policy Liabilities and Short Duration Contracts Short Term Insurance Contracts Adjustment Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Claims Development [Line Items]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	$ 478	$ 573
Total reinsurance recoverable on unpaid claims	65	261
Insurance lines other than short duration	7,071	7,776
Total gross liability for unpaid claims and claim adjustment expenses	7,614	8,610	$ 9,538	$ 9,653
Special property [Member]
Claims Development [Line Items]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	321	501
Total reinsurance recoverable on unpaid claims	0	0
Other Insurance Product [Member]
Claims Development [Line Items]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	157	72
Total reinsurance recoverable on unpaid claims	$ 65	$ 261