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Investments (Other Invested Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Other invested assets $ 1,187,504 $ 1,198,319
Equity securities    
Other invested assets 110,374 126,860
Limited Partner [Member]    
Other invested assets 507,628 446,604
Structured loans    
Other invested assets 53,030 164,309
Derivatives    
Other invested assets 275,518 216,966
Fair Value Option Contractholder Directed Unit Linked Investments [Member]    
Other invested assets 129,511 140,344
Other    
Other invested assets $ 111,443 $ 103,236