Policy Liabilities and Short Duration Contracts Short Term Insurance Contracts Adjustment Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Claims Development [Line Items]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	$ 543
Total reinsurance recoverable on unpaid claims	340
Insurance lines other than short duration	8,655
Total gross liability for unpaid claims and claim adjustment expenses	9,538	$ 9,653	$ 9,560	$ 9,488
Special property [Member]
Claims Development [Line Items]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	500
Total reinsurance recoverable on unpaid claims	0
Other Insurance Product [Member]
Claims Development [Line Items]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	43
Total reinsurance recoverable on unpaid claims	$ 340