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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Net income3true 3us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Adjustments to reconcile net income to net cash provided by operating activities:4false 4us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestmentsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse8214700082147USD$falsefalsefalse2truefalsefalse6405400064054USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Net realized and unrealized investment (losses) gains7true 3us-gaap_IncreaseDecreaseInOperatingCapitalAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Changes in:8false 4pre_IncreaseDecreaseInReinsuranceBalancesNetpre_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-555356000-555356USD$falsefalsefalse2truefalsefalse-281652000-281652USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe net change during the reporting period in the amounts due to or from other insurance companies when the reporting entity has assumed the risk on these policies. 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Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 false2Deferred acquisition costs12false 4pre_IncreaseDecreaseInNetTaxAssetsAndLiabilitiespre_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-144342000-144342USD$falsefalsefalse2truefalsefalse5043100050431USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe net change during the reporting period of all current and deferred tax assets and liabilities.No definition available.false2Net tax assets and liabilities13false 4pre_IncreaseDecreaseInUnpaidLossesAndLossExpensesIncludingLifePolicyBenefitspre_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-181198000-181198USD$falsefalsefalse2truefalsefalse-494083000-494083USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe net change during the reporting period of unpaid losses and loss expenses and policy benefits for life and annuity contracts.No definition available.false2Unpaid losses and loss expenses including life policy benefits14false 4us-gaap_IncreaseDecreaseInUnearnedPremiumsus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse590434000590434USD$falsefalsefalse2truefalsefalse528623000528623USD$falsefalsefalsexbrli:monetaryItemTypemonetaryChange during the period in the unearned portion of premiums written, excluding the portion amortized into income. 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Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 false2Other net changes in operating assets and liabilities16false 3us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse230758000230758USD$falsefalsefalse2truefalsefalse182568000182568USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of net cash from (used in) the entity's continuing operations, excluding cash flows derived by the entity from its discontinued operations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Sales and redemptions of short-term investments21false 3us-gaap_PaymentsToAcquireShortTermInvestmentsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-105446000-105446USD$falsefalsefalse2truefalsefalse-42046000-42046USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. true2Net cash provided by (used in) investing activities24true 2us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Cash flows from financing activities25false 3us-gaap_PaymentsOfOrdinaryDividendsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-103294000-103294USD$falsefalsefalse2truefalsefalse-110735000-110735USD$falsefalsefalsexbrli:monetaryItemTypemonetaryCash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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