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Derivative Instruments (Gain (Loss) Recognized In The Consolidated Statements Of Operations Related To Its Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | $ 8,613 us-gaap_DerivativeGainLossOnDerivativeNet | $ (8,199)us-gaap_DerivativeGainLossOnDerivativeNet
Net realized and unrealized gains on investments | Interest Rate Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | (4,408)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 | (12,274)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1
Net realized and unrealized gains on investments | Credit Default Swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | 40 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 | 159 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1
Net realized and unrealized gains on investments | Weather Contract |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | 160 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_WeatherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 | 1,216 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_WeatherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1
Net foreign exchange losses | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | 3,611 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsUnderwritingAndNonInvestmentOperationsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember | 4,099 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsUnderwritingAndNonInvestmentOperationsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember
Net foreign exchange losses | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | $ 9,210 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsInvestmentOperationsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember | $ (1,399)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsInvestmentOperationsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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