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Derivatives - Balance Sheet (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Derivative Fair Value Of Derivative Asset $ 21,521us-gaap_DerivativeFairValueOfDerivativeAsset [1] $ 44,508us-gaap_DerivativeFairValueOfDerivativeAsset [1]
Derivative Fair Value Of Derivative Liability (27,977)us-gaap_DerivativeFairValueOfDerivativeLiability [1] (14,010)us-gaap_DerivativeFairValueOfDerivativeLiability [1]
Fair value (6,456)us-gaap_DerivativeFairValueOfDerivativeNet 30,498us-gaap_DerivativeFairValueOfDerivativeNet
Foreign exchange forward contracts [Member]    
Derivative [Line Items]    
Derivative Fair Value Of Derivative Asset 20,033us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeForwardMember		 1,249us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeForwardMember
Derivative Fair Value Of Derivative Liability (7,446)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeForwardMember		 (8,648)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeForwardMember
Net notional exposure 2,080,276invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeForwardMember		 1,957,409invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeForwardMember
Fair value 12,587us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeForwardMember		 (7,399)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeForwardMember
Foreign currency option contracts [Member]    
Derivative [Line Items]    
Derivative Fair Value Of Derivative Asset 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeOptionMember		 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeOptionMember
Derivative Fair Value Of Derivative Liability (1,196)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeOptionMember		 (535)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeOptionMember
Net notional exposure 43,380invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeOptionMember		 87,620invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeOptionMember
Fair value (1,196)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeOptionMember		 (535)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeOptionMember
Futures contracts [Member]    
Derivative [Line Items]    
Derivative Fair Value Of Derivative Asset 846us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember		 41,031us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
Derivative Fair Value Of Derivative Liability (467)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember		 0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
Net notional exposure 2,348,735invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember		 3,266,004invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
Fair value 379us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember		 41,031us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
Credit default swaps (protection purchased) [Member]    
Derivative [Line Items]    
Derivative Fair Value Of Derivative Asset   0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CreditDefaultSwapBuyingProtectionMember
Derivative Fair Value Of Derivative Liability   (71)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CreditDefaultSwapBuyingProtectionMember
Net notional exposure   14,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CreditDefaultSwapBuyingProtectionMember
Fair value   (71)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CreditDefaultSwapBuyingProtectionMember
Insurance-linked securities [Member]    
Derivative [Line Items]    
Derivative Fair Value Of Derivative Asset 3us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= pre_InsuranceLinkedSecuritiesMember		 [2] 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= pre_InsuranceLinkedSecuritiesMember		 [2]
Derivative Fair Value Of Derivative Liability (339)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= pre_InsuranceLinkedSecuritiesMember		 [2] (268)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= pre_InsuranceLinkedSecuritiesMember		 [2]
Net notional exposure 145,481invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= pre_InsuranceLinkedSecuritiesMember		 [2] 168,724invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= pre_InsuranceLinkedSecuritiesMember		 [2]
Fair value (336)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= pre_InsuranceLinkedSecuritiesMember		 [2] (268)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= pre_InsuranceLinkedSecuritiesMember		 [2]
Total return swaps [Member]    
Derivative [Line Items]    
Derivative Fair Value Of Derivative Asset 485us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_TotalReturnSwapMember		 79us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_TotalReturnSwapMember
Derivative Fair Value Of Derivative Liability (2,007)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= us-gaap_TotalReturnSwapMember		 (599)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= us-gaap_TotalReturnSwapMember
Net notional exposure 42,524invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_TotalReturnSwapMember		 31,740invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_TotalReturnSwapMember
Fair value (1,522)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_TotalReturnSwapMember		 (520)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_TotalReturnSwapMember
Interest rate swaps [Member]    
Derivative [Line Items]    
Derivative Fair Value Of Derivative Asset 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember		 [3] 2,147us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember		 [3]
Derivative Fair Value Of Derivative Liability (16,282)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember		 [3] (2,558)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember		 [3]
Net notional exposure 201,160invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember		 [3] 202,859invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember		 [3]
Fair value (16,282)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember		 [3] (411)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember		 [3]
TBAs [Member]    
Derivative [Line Items]    
Derivative Fair Value Of Derivative Asset 154us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= pre_ToBeAnnouncedSecuritiesMember		 2us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= pre_ToBeAnnouncedSecuritiesMember
Derivative Fair Value Of Derivative Liability (240)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= pre_ToBeAnnouncedSecuritiesMember		 (1,331)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeByNatureAxis
= pre_ToBeAnnouncedSecuritiesMember
Net notional exposure 235,105invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= pre_ToBeAnnouncedSecuritiesMember		 183,835invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= pre_ToBeAnnouncedSecuritiesMember
Fair value $ (86)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= pre_ToBeAnnouncedSecuritiesMember		 $ (1,329)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= pre_ToBeAnnouncedSecuritiesMember
[1] Amounts include all derivative instruments, irrespective of whether there is a legally enforceable master netting arrangement in place.
[2] At December 31, 2014 and 2013, insurance-linked securities include a longevity swap for which the notional amount is not reflective of the overall potential exposure of the swap. As such, the Company has included the probable maximum loss under the swap within the net notional exposure as an approximation of the notional amount.
[3] The Company enters into interest rate swaps to mitigate notional exposures on certain total return swaps and certain fixed maturities. Only the notional value of interest rate swaps on fixed maturities is presented separately in the table.