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Other expenses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Other Income and Expenses [Abstract]        
Deposit liabilities and reinsurance contracts investment expense $ 2,871tpre_DepositLiabilitiesandReinsuranceContractsInvestmentExpense $ 1,146tpre_DepositLiabilitiesandReinsuranceContractsInvestmentExpense $ 4,352tpre_DepositLiabilitiesandReinsuranceContractsInvestmentExpense $ 2,365tpre_DepositLiabilitiesandReinsuranceContractsInvestmentExpense
Change in fair value of embedded derivatives in deposit and reinsurance contracts (1) 111tpre_ChangeinFairValueofEmbeddedDerivativesinDepositandReinsuranceContracts 100tpre_ChangeinFairValueofEmbeddedDerivativesinDepositandReinsuranceContracts 437tpre_ChangeinFairValueofEmbeddedDerivativesinDepositandReinsuranceContracts 310tpre_ChangeinFairValueofEmbeddedDerivativesinDepositandReinsuranceContracts
Other expenses $ 2,982us-gaap_OtherExpenses $ 1,246us-gaap_OtherExpenses $ 4,789us-gaap_OtherExpenses $ 2,675us-gaap_OtherExpenses