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Investments (Other Invested Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Other invested assets $ 1,368,544 $ 1,298,120
Equity securities    
Other invested assets 117,876 125,862
Limited Partner [Member]    
Other invested assets 602,117 567,697
Structured loans    
Other invested assets 35,751 45,422
Derivatives    
Other invested assets 282,954 256,178
Fair Value Option Contractholder Directed Unit Linked Investments [Member]    
Other invested assets 202,130 197,547
Other    
Other invested assets $ 127,716 $ 105,414