Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Prior Year Claims and Claims Adjustment Expense	$ (8,008)	$ (5,496)	$ (8,488)
Claims and Claims Adjustment Expenses Assumed	0	0	10,343
Group disability, life and DBL Segment Member
Prior Year Claims and Claims Adjustment Expense	(3,742)	(2,728)	(4,464)
Group disability, life and DBL Segment Member | NY Short-Term Disability Product Line
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 6,579
Short-duration Insurance Contracts, Number of Reported Claims	11,000
Group disability, life and DBL Segment Member | Group Disability Product Line | Insurance Benefits, Claims And Reserves Member
Short-duration Insurance Contracts, Discounted Liabilities, Interest Accretion	$ 1,706	$ 1,571	1,451
Group disability, life and DBL Segment Member | Group Disability Product Line | Minimum
Short-Duration Contracts, Discounted Liabilities, Discount Rate	3.00%	3.00%
Group disability, life and DBL Segment Member | Group Disability Product Line | Maximum
Short-Duration Contracts, Discounted Liabilities, Discount Rate	6.00%	6.00%
Group disability, life and DBL Segment Member | Group Disability Product Line | Short-duration Insurance Contracts, Accident Year 2013
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 241
Short-duration Insurance Contracts, Number of Reported Claims	2,629
Claims and Claims Adjustment Expenses Assumed				$ 15,384
Individual life annuities and other Segment Member
Prior Year Claims and Claims Adjustment Expense	$ (3,084)	$ (1,728)	325
Medical Stop-Loss Segment Member
Prior Year Claims and Claims Adjustment Expense	(2,607)	352	3,628
Specialty Health Segment Member
Prior Year Claims and Claims Adjustment Expense	1,425	(1,392)	(7,977)
Specialty Health Segment Member | Short-duration Insurance Contracts, Accident Year 2013
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 660
Short-duration Insurance Contracts, Number of Reported Claims	447,248
Specialty Health Segment Member | Health Insurance Product Line
Prior Year Claims and Claims Adjustment Expense	$ 158	$ (4,702)	$ (8,410)
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 32,142