v2.4.0.6

Investments (Schedule Of Net Realized And Unrealized Gains On Investments And Net Other-Than-Temporary Impairments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Gain (Loss) on Investments [Line Items]
Net realized and unrealized gains (losses) on investments	$ 46,113		$ (5,214)
Total other-than-temporary impairments	(161)		0
Portion recognized in other comprehensive income, before taxes	27	[1]	0	[1]
Net other-than-temporary impairments	(134)		0
Fixed Maturity Investments [Member]
Gain (Loss) on Investments [Line Items]
Gross realized gains	36,286		10,562
Gross realized losses	(6,950)		(12,617)
Net realized gains (losses) on fixed maturity investments	29,336		(2,055)
Net unrealized gains (losses) on investments trading	14,257		(3,758)
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Net unrealized gains (losses) on investments trading	$ 2,520		$ 599
[1] Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.

X

- Definition

This item represents the gross profit realized on the sale of debt securities categorized as trading or available for sale.

+ References

No definition available.

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- Definition

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- Definition

This item represents the gross losses realized on the sale of debt securities categorized as trading or available for sale.

+ References

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- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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X

- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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- Definition

The amount of other than temporary impairment (OTTI) loss on a debt security, categorized as Available-for-sale, related to factors other than credit losses when the entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis. This amount, which includes the portion attributable to the noncontrolling interest, if any, is a portion of the deduction from the total impairment losses of investments (before taxes) presented on the income statement; this amount is also referred to as the amount incurred by the reporting entity or the consolidated entity.

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- Definition

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of trading securities held at each balance sheet date, that was included in earnings for the period. Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and the change in net unrealized holding gain (loss) is included in earnings for the period.

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