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Redeemable Noncontrolling Interest - MT. Logan RE (Activity For Redeemable Noncontrolling Interests) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Redeemable Noncontrolling Interest [Line Items]                
Redeemable noncontrolling interests - Mt. Logan Re, beginning of period       $ 93,378us-gaap_RedeemableNoncontrollingInterestEquityPreferredFairValue     $ 93,378us-gaap_RedeemableNoncontrollingInterestEquityPreferredFairValue  
Net income (loss) attributable to noncontrolling interests (17,140)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (26,337)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (7,741)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (8,089)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (2,110)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (3,768)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 59,307us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 5,878us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Dividends paid on third party investment in redeemable noncontrolling interest             (10,334)us-gaap_PaymentsOfDividendsMinorityInterest  
Redeemable noncontrolling interests - Mt. Logan Re, end of period 421,552us-gaap_RedeemableNoncontrollingInterestEquityPreferredFairValue       93,378us-gaap_RedeemableNoncontrollingInterestEquityPreferredFairValue   421,552us-gaap_RedeemableNoncontrollingInterestEquityPreferredFairValue 93,378us-gaap_RedeemableNoncontrollingInterestEquityPreferredFairValue
Logan Re [Member]                
Redeemable Noncontrolling Interest [Line Items]                
Redeemable noncontrolling interests - Mt. Logan Re, beginning of period       93,378us-gaap_RedeemableNoncontrollingInterestEquityPreferredFairValue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
    93,378us-gaap_RedeemableNoncontrollingInterestEquityPreferredFairValue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Unaffiliated third party investments during period, net             279,200re_RedeemableNoncontrollingInterestUnaffiliatedThirdPartyInvestmentDuringPeriod
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
87,500re_RedeemableNoncontrollingInterestUnaffiliatedThirdPartyInvestmentDuringPeriod
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Net income (loss) attributable to noncontrolling interests             59,307us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
5,878us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Dividends paid on third party investment in redeemable noncontrolling interest             (10,334)us-gaap_PaymentsOfDividendsMinorityInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Redeemable noncontrolling interests - Mt. Logan Re, end of period $ 421,552us-gaap_RedeemableNoncontrollingInterestEquityPreferredFairValue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
      $ 93,378us-gaap_RedeemableNoncontrollingInterestEquityPreferredFairValue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
  $ 421,552us-gaap_RedeemableNoncontrollingInterestEquityPreferredFairValue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
$ 93,378us-gaap_RedeemableNoncontrollingInterestEquityPreferredFairValue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember