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Investments (Other Invested Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Other Investments [Line Items]
Other invested assets	$ 1,243,033us-gaap_OtherInvestments	$ 1,198,319us-gaap_OtherInvestments
Equity securities
Other Investments [Line Items]
Other invested assets	134,619	126,860
Limited Partner [Member]
Other Investments [Line Items]
Other invested assets	450,842	446,604
Structured loans
Other Investments [Line Items]
Other invested assets	148,377	164,309
Derivatives
Other Investments [Line Items]
Other invested assets	265,020	216,966
Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Other Investments [Line Items]
Other invested assets	136,597	140,344
Other
Other Investments [Line Items]
Other invested assets	$ 107,578	$ 103,236