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Reinsurance premiums ceded (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Ceded Credit Risk [Line Items]            
Loss and loss expenses recovered $ 2,100,000us-gaap_ReinsuranceCostsAndRecoveriesNet $ 1,000,000us-gaap_ReinsuranceCostsAndRecoveriesNet $ 6,300,000us-gaap_ReinsuranceCostsAndRecoveriesNet $ 9,300,000us-gaap_ReinsuranceCostsAndRecoveriesNet    
Loss and loss adjustment expenses recoverable $ 6,284,000us-gaap_ReinsuranceRecoverables $ 1,412,000us-gaap_ReinsuranceRecoverables $ 6,284,000us-gaap_ReinsuranceRecoverables $ 9,277,000us-gaap_ReinsuranceRecoverables $ 0us-gaap_ReinsuranceRecoverables $ 0us-gaap_ReinsuranceRecoverables
AM Best, A Rating            
Ceded Credit Risk [Line Items]            
Number of retrocessionaire   1tpre_NumberofRetrocessionaire
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestARatingMember
  1tpre_NumberofRetrocessionaire
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestARatingMember