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Investments (Other Invested Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other invested assets	$ 1,512,147	$ 1,505,332
Limited Partner [Member]
Other invested assets	805,613	781,124
Equity Release Mortgages [Member]
Other invested assets	261,837	219,940
Derivatives
Other invested assets	132,195	137,613
Fair Value Option Contractholder Directed Unit Linked Investments [Member]
Other invested assets	221,512	218,541
Other
Other invested assets	$ 90,990	$ 148,114

X

- Definition

Amount of investments classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f,g))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Period Type:	instant

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- Details

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- Details

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- Details

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- Details

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