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Noncontrolling Interests (Schedule Of Redeemable Noncontrolling Interest) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Activity in redeemable noncontrolling interest
Beginning balance	$ 1,045,964
Net income attributable to redeemable noncontrolling interest	44,591	$ 39,662
Ending balance	1,081,337		$ 1,045,964
DaVinciRe Holdings Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	930,955	1,037,306	1,037,306
Redemption of shares from redeemable noncontrolling interest	(90,818)	(207,898)
Sale of shares to redeemable noncontrolling interest	43,040	0
Net income attributable to redeemable noncontrolling interest	42,964	38,326
Ending balance	926,141	867,734	930,955
RenaissanceRe Medici Fund Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	115,009	94,402	94,402
Redemption of shares from redeemable noncontrolling interest	(940)	(14,684)	(20,100)
Sale of shares to redeemable noncontrolling interest	39,500	19,643	36,100
Net income attributable to redeemable noncontrolling interest	1,627	1,336
Ending balance	$ 155,196	$ 100,697	$ 115,009

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

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-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
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Amount of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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