Investments - Investments in Life Settlements (Details) $ in Thousands	Mar. 31, 2016 USD ($) contract	Dec. 31, 2015 USD ($) contract
Number of Contracts
Number of Contracts, 0-1 years | contract	2	2
Number of Contracts, 1-2 years | contract	3	4
Number of Contracts, 2-3 years | contract	16	19
Number of Contracts, 3-4 years | contract	17	14
Number of Contracts, 4-5 years | contract	17	16
Number of Contracts, thereafter | contract	205	221
Number of Contracts, total | contract	260	276
Carrying Value
Carrying Value, 0-1 years	$ 425	$ 417
Carrying Value, 1-2 years	2,601	3,032
Carrying Value, 2-3 years	24,226	24,072
Carrying Value, 3-4 years	13,306	9,695
Carrying Value, 4-5 years	8,126	9,025
Carrying Value, thereafter	82,484	86,830
Carrying Value, total	131,168	133,071
Face Value (Death Benefits)
Face Value (Death Benefits), 0-1 years	700	700
Face Value (Death Benefits), 1-2 years	4,500	5,000
Face Value (Death Benefits), 2-3 years	50,407	39,123
Face Value (Death Benefits), 3-4 years	29,960	20,932
Face Value (Death Benefits), 4-5 years	20,348	22,457
Face Value (Death Benefits), thereafter	451,305	491,499
Face Value (Death Benefits), total	$ 557,220	$ 579,711