Investments - Investments in Life Settlements (Details) $ in Thousands	Dec. 31, 2015 USD ($) contract
Number of Contracts
Number of Contracts, 0-1 years | contract	2
Number of Contracts, 1-2 years | contract	4
Number of Contracts, 2-3 years | contract	19
Number of Contracts, 3-4 years | contract	14
Number of Contracts, 4-5 years | contract	16
Number of Contracts, thereafter | contract	221
Number of Contracts, total | contract	276
Carrying Value
Carrying Value, 0-1 years	$ 417
Carrying Value, 1-2 years	3,032
Carrying Value, 2-3 years	24,072
Carrying Value, 3-4 years	9,695
Carrying Value, 4-5 years	9,025
Carrying Value, thereafter	86,830
Carrying Value, total	133,071
Face Value (Death Benefits)
Face Value (Death Benefits), 0-1 years	700
Face Value (Death Benefits), 1-2 years	5,000
Face Value (Death Benefits), 2-3 years	39,123
Face Value (Death Benefits), 3-4 years	20,932
Face Value (Death Benefits), 4-5 years	22,457
Face Value (Death Benefits), thereafter	491,499
Face Value (Death Benefits), total	$ 579,711