Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows provided by operating activities
Net income	$ 213,100us-gaap_ProfitLoss	$ 199,366us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash (used in) provided by operating activities
Amortization, accretion and depreciation	4,813	8,305
Equity in undistributed earnings of other ventures	(3,676)	(1,204)
Net realized and unrealized gains on investments	(41,749)us-gaap_GainLossOnInvestments	(14,927)us-gaap_GainLossOnInvestments
Net unrealized gains included in net investment income	(4,885)us-gaap_UnrealizedGainLossOnInvestments	(4,980)us-gaap_UnrealizedGainLossOnInvestments
Change in:
Premiums receivable	(193,690)	(194,701)
Prepaid reinsurance premiums	(130,801)	(141,620)
Reinsurance recoverable	(12,274)	2,063
Deferred acquisition costs	(35,914)	(40,206)
Reserve for claims and claim expenses	(28,787)	(30,847)
Unearned premiums	238,075	305,433
Reinsurance balances payable	35,995	175,622
Other	(158,812)	(215,665)
Net cash (used in) provided by operating activities	(118,605)	46,639
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	2,075,678	1,996,035
Purchases of fixed maturity investments trading	(1,490,123)	(1,768,996)
Proceeds from sales and maturities of fixed maturity investments available for sale	1,757	4,090
Net sales (purchases) of equity investments trading	50,627	(279)
Net sales of short term investments	112,795	67,313
Net (purchases) sales of other investments	(7,952)	2,116
Net (purchases) sales of investments in other ventures	(126)	915
Net purchases of other assets	(2,500)	0
Net purchase of Platinum	(678,152)	0
Net cash provided by investing activities	62,004	301,194
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	(13,720)us-gaap_PaymentsOfDividendsCommonStock	(11,899)us-gaap_PaymentsOfDividendsCommonStock
Dividends paid – preference shares	(5,595)	(5,595)
RenaissanceRe common share repurchases	(446)	(262,736)
Issuance of debt, net of expenses	297,823us-gaap_ProceedsFromRepaymentsOfDebt	0us-gaap_ProceedsFromRepaymentsOfDebt
Net third party redeemable noncontrolling interest share transactions	(180,285)	(147,943)
Net cash provided by (used in) financing activities	97,777	(428,173)
Effect of exchange rate changes on foreign currency cash	(9,142)	(529)
Net increase (decrease) in cash and cash equivalents	32,034	(80,869)
Cash and cash equivalents, beginning of period	525,584	408,032
Cash and cash equivalents, end of period	$ 557,618	$ 327,163

The net cash inflow (outflow) associated with the acquisition or disposal of other investments during the period.

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The net amount paid (received) by the reporting entity through acquisition (sale/maturities) of short-term investments with an original maturity that is one year or less which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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The increase (decrease) during the reporting period in the balance sheet value of capitalized sales costs that are associated with acquiring a new insurance customers.

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The change in the premium receivable balance on the balance sheet.

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The change in prepaid reinsurance premiums recorded on the balance sheet, which is needed to adjust net income to arrive at net cash flows provided by or used in operations.

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The increase (decrease) during the reporting period in the amount due to other insurance companies when the reporting entity has assumed a portion of the cedant's insurance risk which has resulted in insurance losses.

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The increase (decrease) during the reporting period in the amount of benefits the ceding insurer expects to recover on insurance policies ceded to other insurance entities as of the balance sheet date for all guaranteed benefit types.

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Amount of increase (decrease) unearned premiums written. Excludes portion of unearned premiums amortized into income.

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The amount of the other adjustment made to the claims reserves during the period.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash inflow associated with the sale, maturities, repayments and calls of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

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