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Fair Value (Details - Change in fair value option table) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items]    
Change in unrealized gain/loss $ 74,328us-gaap_FairValueOptionChangesInFairValueGainLoss1 $ 131,902us-gaap_FairValueOptionChangesInFairValueGainLoss1
Fixed maturities and short term investments [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Change in unrealized gain/loss 76,971us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= pre_FixedMaturitiesAndShortTermInvestmentsMember
119,799us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= pre_FixedMaturitiesAndShortTermInvestmentsMember
Equities [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Change in unrealized gain/loss (7,016)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_EquitySecuritiesMember
10,325us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_EquitySecuritiesMember
Other invested assets [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Change in unrealized gain/loss 1,833us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= pre_OtherInvestedAssetsMember
1,042us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= pre_OtherInvestedAssetsMember
Funds Held - Directly Managed investment [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Change in unrealized gain/loss $ 2,540us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= pre_FundsHeldDirectlyManagedInvestmentMember
$ 736us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= pre_FundsHeldDirectlyManagedInvestmentMember