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USD ($)

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12/31/2010
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12/31/2009
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1/1/2010 - 12/31/2010
USD ($)
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USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 107
 -Paragraph 15A
 -Subparagraph b

</ElementReferences><IsTotalLabel>false</IsTotalLabel><IsEPS>false</IsEPS><Label>AAA rated debt securities issued by the government of France</Label></Row><Row><Id>5</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><Level>0</Level><ElementName>pre_ConcentrationRiskCreditRiskUninsuredDepositsMaximumValue</ElementName><ElementPrefix>pre</ElementPrefix><IsBaseElement>false</IsBaseElement><BalanceType>debit</BalanceType><PeriodType>instant</PeriodType><ShortDefinition>The maximum amount of cash and cash equivalents, excluding custodial accounts, that the Company may keep at any point in 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