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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Acquisitions (Summary of Intangible Assets Acquired) (Details) - USD ($) $ in Thousands	Apr. 02, 2015	Sep. 30, 2015	Apr. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill		$ 354,781		$ 278,258
Hong Kong And Singapore Operations Of Royal Sun Alliance Insurance Plc [Member]
Business Acquisition [Line Items]
Goodwill	$ 76,239
Intangible assets and VOBA	$ 127,704
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years
Value Of Business Acquired [Member] \| Hong Kong And Singapore Operations Of Royal Sun Alliance Insurance Plc [Member]
Business Acquisition [Line Items]
Intangible assets and VOBA	$ 37,104
Customer-Related Intangible Assets [Member] \| Hong Kong And Singapore Operations Of Royal Sun Alliance Insurance Plc [Member]
Business Acquisition [Line Items]
Intangible assets and VOBA	15,400
Distribution Rights [Member] \| Hong Kong And Singapore Operations Of Royal Sun Alliance Insurance Plc [Member]
Business Acquisition [Line Items]
Intangible assets and VOBA	75,200
SINGAPORE \| Hong Kong And Singapore Operations Of Royal Sun Alliance Insurance Plc [Member]
Business Acquisition [Line Items]
Goodwill	52,427
Intangible assets and VOBA	76,945
SINGAPORE \| Value Of Business Acquired [Member] \| Hong Kong And Singapore Operations Of Royal Sun Alliance Insurance Plc [Member]
Business Acquisition [Line Items]
Intangible assets and VOBA	$ 19,845
Finite-Lived Intangible Asset, Useful Life	2 years
SINGAPORE \| Customer-Related Intangible Assets [Member] \| Hong Kong And Singapore Operations Of Royal Sun Alliance Insurance Plc [Member]
Business Acquisition [Line Items]
Intangible assets and VOBA	$ 8,600
Finite-Lived Intangible Asset, Useful Life	4 years
SINGAPORE \| Distribution Rights [Member] \| Hong Kong And Singapore Operations Of Royal Sun Alliance Insurance Plc [Member]
Business Acquisition [Line Items]
Intangible assets and VOBA	$ 48,500
Finite-Lived Intangible Asset, Useful Life	18 years
HONG KONG \| Hong Kong And Singapore Operations Of Royal Sun Alliance Insurance Plc [Member]
Business Acquisition [Line Items]
Goodwill	$ 23,812
Intangible assets and VOBA	50,759
HONG KONG \| Value Of Business Acquired [Member] \| Hong Kong And Singapore Operations Of Royal Sun Alliance Insurance Plc [Member]
Business Acquisition [Line Items]
Intangible assets and VOBA	$ 17,259
Finite-Lived Intangible Asset, Useful Life	1 year 6 months
HONG KONG \| Customer-Related Intangible Assets [Member] \| Hong Kong And Singapore Operations Of Royal Sun Alliance Insurance Plc [Member]
Business Acquisition [Line Items]
Intangible assets and VOBA	$ 6,800
Finite-Lived Intangible Asset, Useful Life	7 years
HONG KONG \| Distribution Rights [Member] \| Hong Kong And Singapore Operations Of Royal Sun Alliance Insurance Plc [Member]
Business Acquisition [Line Items]
Intangible assets and VOBA	$ 26,700
Finite-Lived Intangible Asset, Useful Life	18 years
Labuan Operations of Royal Sun Alliance Insurance Plc [Member] \| Hong Kong And Singapore Operations Of Royal Sun Alliance Insurance Plc [Member]
Business Acquisition [Line Items]
Goodwill			$ 1,396