Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Securities loaned
Cash collateral received as percentage of fair value of securities loaned		102.00%
Deferred policy acquisition and sales inducement costs
Present value of future profits		$ 4,000	$ 7,000
Present Value of Future Insurance Profits, Amortization Expense		$ 377	$ 1,000	$ 2,000
Income Tax Expense, Effect of Adoption, Quantification	$ 17,000
Minimum
Deferred policy acquisition and sales inducement costs
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts		15 years
Maximum
Securities loaned
Length of securities lending transaction period		30 days
Deferred policy acquisition and sales inducement costs
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts		30 years
Interest-sensitive life insurance | Minimum
Deferred policy acquisition and sales inducement costs
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts		10 years
Interest-sensitive life insurance | Maximum
Deferred policy acquisition and sales inducement costs
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts		20 years
Fixed annuities | Minimum
Deferred policy acquisition and sales inducement costs
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts		5 years
Fixed annuities | Maximum
Deferred policy acquisition and sales inducement costs
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts		10 years