0001127703false2020FYus-gaap:AccountingStandardsUpdate201807Memberus-gaap:AccountingStandardsUpdate201613MemberP3Y00011277032020-01-012020-12-31iso4217:USD00011277032020-06-30xbrli:shares00011277032021-02-190001127703us-gaap:TaxYear2020Member2020-12-310001127703us-gaap:TaxYear2019Member2020-12-310001127703srt:ScenarioForecastMemberpra:NORCALGroupMember2021-04-012021-06-3000011277032020-12-3100011277032019-12-31iso4217:USDxbrli:shares0001127703us-gaap:CommonStockMember2017-12-310001127703us-gaap:AdditionalPaidInCapitalMember2017-12-310001127703us-gaap:AccumulatedOtherComprehensiveIncomeMember2017-12-310001127703us-gaap:RetainedEarningsMember2017-12-310001127703us-gaap:TreasuryStockMember2017-12-3100011277032017-12-310001127703us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:AccountingStandardsUpdate201601Member2017-12-310001127703srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:AccountingStandardsUpdate201601Member2017-12-310001127703us-gaap:AccumulatedOtherComprehensiveIncomeMemberus-gaap:AccountingStandardsUpdate201802Membersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2017-12-310001127703us-gaap:RetainedEarningsMemberus-gaap:AccountingStandardsUpdate201802Membersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2017-12-310001127703us-gaap:AccountingStandardsUpdate201802Membersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2017-12-310001127703us-gaap:AdditionalPaidInCapitalMember2018-01-012018-12-310001127703us-gaap:TreasuryStockMember2018-01-012018-12-3100011277032018-01-012018-12-310001127703us-gaap:CommonStockMember2018-01-012018-12-310001127703us-gaap:RetainedEarningsMember2018-01-012018-12-310001127703us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310001127703us-gaap:CommonStockMember2018-12-310001127703us-gaap:AdditionalPaidInCapitalMember2018-12-310001127703us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-12-310001127703us-gaap:RetainedEarningsMember2018-12-310001127703us-gaap:TreasuryStockMember2018-12-3100011277032018-12-310001127703us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2018-12-310001127703srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2018-12-310001127703us-gaap:AdditionalPaidInCapitalMember2019-01-012019-12-310001127703us-gaap:TreasuryStockMember2019-01-012019-12-3100011277032019-01-012019-12-310001127703us-gaap:CommonStockMember2019-01-012019-12-310001127703us-gaap:RetainedEarningsMember2019-01-012019-12-310001127703us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310001127703us-gaap:CommonStockMember2019-12-310001127703us-gaap:AdditionalPaidInCapitalMember2019-12-310001127703us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310001127703us-gaap:RetainedEarningsMember2019-12-310001127703us-gaap:TreasuryStockMember2019-12-310001127703us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310001127703srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310001127703us-gaap:AdditionalPaidInCapitalMember2020-01-012020-12-310001127703us-gaap:CommonStockMember2020-01-012020-12-310001127703us-gaap:RetainedEarningsMember2020-01-012020-12-310001127703us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310001127703us-gaap:CommonStockMember2020-12-310001127703us-gaap:AdditionalPaidInCapitalMember2020-12-310001127703us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310001127703us-gaap:RetainedEarningsMember2020-12-310001127703us-gaap:TreasuryStockMember2020-12-31pra:segment0001127703us-gaap:BuildingAndBuildingImprovementsMember2020-12-310001127703us-gaap:BuildingAndBuildingImprovementsMember2019-12-310001127703us-gaap:BuildingAndBuildingImprovementsMember2020-01-012020-12-310001127703us-gaap:BuildingAndBuildingImprovementsMember2019-01-012019-12-310001127703us-gaap:BuildingAndBuildingImprovementsMember2018-01-012018-12-3100011277032018-01-012018-09-3000011277032020-07-012020-09-300001127703srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2020-01-01xbrli:pure0001127703us-gaap:FairValueInputsLevel1Memberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310001127703us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310001127703us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberpra:CorporateBondsMultipleObservableInputsMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberpra:CorporateBondsMultipleObservableInputsMemberus-gaap:FairValueInputsLevel2Member2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberpra:CorporateBondsMultipleObservableInputsMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberpra:CorporateBondsMultipleObservableInputsMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberpra:CorporateDebtLimitedObservableInputsMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberpra:CorporateDebtLimitedObservableInputsMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberpra:CorporateDebtLimitedObservableInputsMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberpra:CorporateDebtLimitedObservableInputsMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310001127703us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310001127703us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberpra:EquityFinancialSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703pra:EquityFinancialSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310001127703us-gaap:FairValueInputsLevel3Memberpra:EquityFinancialSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703pra:EquityFinancialSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberpra:UtilitiesEnergyEquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703pra:UtilitiesEnergyEquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310001127703pra:UtilitiesEnergyEquitySecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703pra:UtilitiesEnergyEquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberpra:ConsumerOrientedMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberpra:ConsumerOrientedMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberpra:ConsumerOrientedMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberpra:ConsumerOrientedMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberpra:EquityIndustrialSecuritiesMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberpra:EquityIndustrialSecuritiesMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberpra:EquityIndustrialSecuritiesMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberpra:EquityIndustrialSecuritiesMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FixedIncomeFundsMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FixedIncomeFundsMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FixedIncomeFundsMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FixedIncomeFundsMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberpra:AllOtherMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703pra:AllOtherMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310001127703pra:AllOtherMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703pra:AllOtherMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ShortTermInvestmentsMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ShortTermInvestmentsMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ShortTermInvestmentsMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ShortTermInvestmentsMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherInvestmentsMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquitySecuritiesMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberpra:InvestmentsInUnconsolidatedSubsidiariesMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310001127703us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember2019-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310001127703us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberpra:CorporateBondsMultipleObservableInputsMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberpra:CorporateBondsMultipleObservableInputsMemberus-gaap:FairValueInputsLevel2Member2019-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberpra:CorporateBondsMultipleObservableInputsMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberpra:CorporateBondsMultipleObservableInputsMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberpra:CorporateDebtLimitedObservableInputsMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberpra:CorporateDebtLimitedObservableInputsMember2019-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberpra:CorporateDebtLimitedObservableInputsMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberpra:CorporateDebtLimitedObservableInputsMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember2019-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310001127703us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310001127703us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberpra:EquityFinancialSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703pra:EquityFinancialSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310001127703us-gaap:FairValueInputsLevel3Memberpra:EquityFinancialSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703pra:EquityFinancialSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberpra:UtilitiesEnergyEquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703pra:UtilitiesEnergyEquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310001127703pra:UtilitiesEnergyEquitySecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703pra:UtilitiesEnergyEquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberpra:ConsumerOrientedMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberpra:ConsumerOrientedMember2019-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberpra:ConsumerOrientedMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberpra:ConsumerOrientedMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberpra:EquityIndustrialSecuritiesMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberpra:EquityIndustrialSecuritiesMember2019-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberpra:EquityIndustrialSecuritiesMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberpra:EquityIndustrialSecuritiesMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FixedIncomeFundsMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FixedIncomeFundsMember2019-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FixedIncomeFundsMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FixedIncomeFundsMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberpra:AllOtherMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703pra:AllOtherMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310001127703pra:AllOtherMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703pra:AllOtherMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ShortTermInvestmentsMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ShortTermInvestmentsMember2019-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ShortTermInvestmentsMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ShortTermInvestmentsMember2019-12-310001127703us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherInvestmentsMember2019-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquitySecuritiesMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2019-12-310001127703us-gaap:FairValueMeasurementsRecurringMemberpra:InvestmentsInUnconsolidatedSubsidiariesMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2019-12-310001127703us-gaap:InterestRateCapMember2020-12-310001127703us-gaap:OtherAssetsMemberus-gaap:InterestRateCapMember2020-12-310001127703us-gaap:LondonInterbankOfferedRateLIBORMemberus-gaap:MortgagesMember2020-01-012020-12-310001127703pra:NationallyRecognizedStatisticalRatingOrganizationNRSRORatingBBplusMemberpra:CorporateDebtLimitedObservableInputsMember2020-01-012020-12-310001127703pra:NationallyRecognizedStatisticalRatingOrganizationNRSRORatingBBBminusMemberpra:CorporateDebtLimitedObservableInputsMember2019-01-012019-12-310001127703pra:OtherAssetBackedSecuritiesMemberpra:NationallyRecognizedStatisticalRatingOrganizationNRSRORatingAAAMember2020-01-012020-12-310001127703pra:OtherAssetBackedSecuritiesMemberpra:NationallyRecognizedStatisticalRatingOrganizationNRSRORatingAAMember2019-01-012019-12-310001127703us-gaap:FairValueInputsLevel3Memberpra:CorporateDebtLimitedObservableInputsMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberpra:CorporateDebtLimitedObservableInputsMember2019-12-310001127703srt:MinimumMemberus-gaap:MeasurementInputComparabilityAdjustmentMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Memberpra:CorporateDebtLimitedObservableInputsMember2020-12-310001127703us-gaap:MeasurementInputComparabilityAdjustmentMembersrt:MaximumMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Memberpra:CorporateDebtLimitedObservableInputsMember2020-12-310001127703srt:WeightedAverageMemberus-gaap:MeasurementInputComparabilityAdjustmentMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Memberpra:CorporateDebtLimitedObservableInputsMember2020-12-310001127703srt:MinimumMemberus-gaap:MeasurementInputComparabilityAdjustmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:IncomeApproachValuationTechniqueMemberpra:CorporateDebtLimitedObservableInputsMember2020-12-310001127703us-gaap:MeasurementInputComparabilityAdjustmentMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:IncomeApproachValuationTechniqueMemberpra:CorporateDebtLimitedObservableInputsMember2020-12-310001127703srt:WeightedAverageMemberus-gaap:MeasurementInputComparabilityAdjustmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:IncomeApproachValuationTechniqueMemberpra:CorporateDebtLimitedObservableInputsMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2019-12-310001127703srt:MinimumMemberus-gaap:MeasurementInputComparabilityAdjustmentMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310001127703us-gaap:MeasurementInputComparabilityAdjustmentMembersrt:MaximumMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310001127703srt:WeightedAverageMemberus-gaap:MeasurementInputComparabilityAdjustmentMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310001127703srt:MinimumMemberus-gaap:MeasurementInputComparabilityAdjustmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:IncomeApproachValuationTechniqueMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310001127703us-gaap:MeasurementInputComparabilityAdjustmentMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:IncomeApproachValuationTechniqueMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310001127703srt:WeightedAverageMemberus-gaap:MeasurementInputComparabilityAdjustmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:IncomeApproachValuationTechniqueMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310001127703pra:OtherAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310001127703pra:OtherAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2019-12-310001127703pra:OtherAssetBackedSecuritiesMembersrt:MinimumMemberus-gaap:MeasurementInputComparabilityAdjustmentMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Member2020-12-310001127703pra:OtherAssetBackedSecuritiesMemberus-gaap:MeasurementInputComparabilityAdjustmentMembersrt:MaximumMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Member2020-12-310001127703srt:WeightedAverageMemberpra:OtherAssetBackedSecuritiesMemberus-gaap:MeasurementInputComparabilityAdjustmentMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Member2020-12-310001127703pra:OtherAssetBackedSecuritiesMembersrt:MinimumMemberus-gaap:MeasurementInputComparabilityAdjustmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:IncomeApproachValuationTechniqueMember2020-12-310001127703pra:OtherAssetBackedSecuritiesMemberus-gaap:MeasurementInputComparabilityAdjustmentMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:IncomeApproachValuationTechniqueMember2020-12-310001127703srt:WeightedAverageMemberpra:OtherAssetBackedSecuritiesMemberus-gaap:MeasurementInputComparabilityAdjustmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:IncomeApproachValuationTechniqueMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:OtherInvestmentsMember2020-12-310001127703us-gaap:FairValueInputsLevel3Memberus-gaap:OtherInvestmentsMember2019-12-310001127703srt:MinimumMemberus-gaap:MeasurementInputComparabilityAdjustmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:IncomeApproachValuationTechniqueMemberus-gaap:OtherInvestmentsMember2020-12-310001127703us-gaap:MeasurementInputComparabilityAdjustmentMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:IncomeApproachValuationTechniqueMemberus-gaap:OtherInvestmentsMember2020-12-310001127703srt:WeightedAverageMemberus-gaap:MeasurementInputComparabilityAdjustmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:IncomeApproachValuationTechniqueMemberus-gaap:OtherInvestmentsMember2020-12-310001127703us-gaap:CorporateDebtSecuritiesMember2019-12-310001127703us-gaap:AssetBackedSecuritiesMember2019-12-310001127703us-gaap:OtherInvestmentsMember2019-12-310001127703us-gaap:InvestmentIncomeMemberus-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001127703us-gaap:AssetBackedSecuritiesMemberus-gaap:InvestmentIncomeMember2020-01-012020-12-310001127703us-gaap:InvestmentIncomeMemberus-gaap:OtherInvestmentsMember2020-01-012020-12-310001127703us-gaap:InvestmentIncomeMember2020-01-012020-12-310001127703us-gaap:GainLossOnInvestmentsMember1us-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001127703us-gaap:AssetBackedSecuritiesMemberus-gaap:GainLossOnInvestmentsMember12020-01-012020-12-310001127703us-gaap:GainLossOnInvestmentsMember1us-gaap:OtherInvestmentsMember2020-01-012020-12-310001127703us-gaap:GainLossOnInvestmentsMember12020-01-012020-12-310001127703us-gaap:CorporateDebtSecuritiesMember2020-01-012020-12-310001127703us-gaap:AssetBackedSecuritiesMember2020-01-012020-12-310001127703us-gaap:OtherInvestmentsMember2020-01-012020-12-310001127703us-gaap:CorporateDebtSecuritiesMember2020-12-310001127703us-gaap:AssetBackedSecuritiesMember2020-12-310001127703us-gaap:OtherInvestmentsMember2020-12-310001127703us-gaap:CorporateDebtSecuritiesMember2018-12-310001127703us-gaap:AssetBackedSecuritiesMember2018-12-310001127703us-gaap:OtherInvestmentsMember2018-12-310001127703us-gaap:InvestmentIncomeMemberus-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001127703us-gaap:AssetBackedSecuritiesMemberus-gaap:InvestmentIncomeMember2019-01-012019-12-310001127703us-gaap:InvestmentIncomeMemberus-gaap:OtherInvestmentsMember2019-01-012019-12-310001127703us-gaap:InvestmentIncomeMember2019-01-012019-12-310001127703us-gaap:GainLossOnInvestmentsMember1us-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001127703us-gaap:AssetBackedSecuritiesMemberus-gaap:GainLossOnInvestmentsMember12019-01-012019-12-310001127703us-gaap:GainLossOnInvestmentsMember1us-gaap:OtherInvestmentsMember2019-01-012019-12-310001127703us-gaap:GainLossOnInvestmentsMember12019-01-012019-12-310001127703us-gaap:CorporateDebtSecuritiesMember2019-01-012019-12-310001127703us-gaap:AssetBackedSecuritiesMember2019-01-012019-12-310001127703us-gaap:OtherInvestmentsMember2019-01-012019-12-310001127703pra:MortgageFundMemberus-gaap:EquitySecuritiesMember2020-12-310001127703pra:MortgageFundMemberus-gaap:EquitySecuritiesMember2019-12-310001127703pra:PrivateDebtFundsMemberpra:InvestmentsInUnconsolidatedSubsidiariesMember2020-12-310001127703pra:PrivateDebtFundsMemberpra:InvestmentsInUnconsolidatedSubsidiariesMember2019-12-310001127703us-gaap:PrivateEquityFundsForeignMemberpra:InvestmentsInUnconsolidatedSubsidiariesMember2020-12-310001127703us-gaap:PrivateEquityFundsForeignMemberpra:InvestmentsInUnconsolidatedSubsidiariesMember2019-12-310001127703pra:LongshortEquityFundsMemberpra:InvestmentsInUnconsolidatedSubsidiariesMember2020-12-310001127703pra:LongshortEquityFundsMemberpra:InvestmentsInUnconsolidatedSubsidiariesMember2019-12-310001127703pra:InvestmentsInUnconsolidatedSubsidiariesMemberus-gaap:PrivateEquityFundsMember2020-12-310001127703pra:InvestmentsInUnconsolidatedSubsidiariesMemberus-gaap:PrivateEquityFundsMember2019-12-310001127703pra:InvestmentsInUnconsolidatedSubsidiariesMemberpra:MultiStrategyFundofFundsMember2020-12-310001127703pra:InvestmentsInUnconsolidatedSubsidiariesMemberpra:MultiStrategyFundofFundsMember2019-12-310001127703pra:InvestmentsInUnconsolidatedSubsidiariesMemberpra:StructuredCreditFundMember2020-12-310001127703pra:InvestmentsInUnconsolidatedSubsidiariesMemberpra:StructuredCreditFundMember2019-12-310001127703pra:LongShortCommodityFundMemberpra:InvestmentsInUnconsolidatedSubsidiariesMember2020-12-310001127703pra:LongShortCommodityFundMemberpra:InvestmentsInUnconsolidatedSubsidiariesMember2019-12-310001127703pra:StrategyFocusedFundMemberpra:InvestmentsInUnconsolidatedSubsidiariesMember2020-12-310001127703pra:StrategyFocusedFundMemberpra:InvestmentsInUnconsolidatedSubsidiariesMember2019-12-310001127703pra:InvestmentsInUnconsolidatedSubsidiariesMember2020-12-310001127703pra:InvestmentsInUnconsolidatedSubsidiariesMember2019-12-310001127703pra:MortgageFundMember2020-01-012020-12-31pra:fund0001127703pra:PrivateDebtFundsMember2020-01-012020-12-310001127703srt:MinimumMemberpra:PrivateDebtFundsMember2020-01-012020-12-310001127703srt:MaximumMemberpra:PrivateDebtFundsMember2020-01-012020-12-310001127703pra:LongshortEquityFundsMember2020-12-310001127703pra:LongshortEquityFundsMember2020-01-012020-12-310001127703us-gaap:PrivateEquityFundsMember2020-01-012020-12-31pra:lender0001127703pra:StructuredCreditFundMember2020-01-012020-12-3100011277032020-09-300001127703us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:CashSurrenderValueMember2020-12-310001127703us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CashSurrenderValueMember2020-12-310001127703us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:CashSurrenderValueMember2019-12-310001127703us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CashSurrenderValueMember2019-12-310001127703us-gaap:OtherInvestmentsMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310001127703us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:OtherInvestmentsMember2020-12-310001127703us-gaap:OtherInvestmentsMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310001127703us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:OtherInvestmentsMember2019-12-310001127703us-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310001127703us-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310001127703us-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310001127703us-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310001127703us-gaap:SeniorNotesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310001127703us-gaap:SeniorNotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310001127703us-gaap:SeniorNotesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310001127703us-gaap:SeniorNotesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310001127703us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:MortgagesMember2020-12-310001127703us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:MortgagesMember2020-12-310001127703us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:MortgagesMember2019-12-310001127703us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:MortgagesMember2019-12-310001127703us-gaap:USTreasurySecuritiesMember2020-12-310001127703us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember2020-12-310001127703us-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310001127703us-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310001127703us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember2020-12-310001127703us-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310001127703us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2020-12-310001127703us-gaap:USTreasurySecuritiesMember2019-12-310001127703us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember2019-12-310001127703us-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310001127703us-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310001127703us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember2019-12-310001127703us-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310001127703us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember2019-12-31pra:investment_affiliate0001127703us-gaap:DebtSecuritiesMember2020-12-310001127703us-gaap:CashAndCashEquivalentsMember2020-12-310001127703pra:Syndicate1729Member2020-07-012020-09-300001127703pra:Syndicate1729Member2020-09-300001127703pra:Syndicate1729Member2019-12-31pra:security0001127703pra:NonGovernmentBackedMember2020-12-31pra:issuer0001127703pra:NonGovernmentBackedMember2019-12-310001127703us-gaap:DebtSecuritiesMember2020-01-012020-12-310001127703us-gaap:DebtSecuritiesMember2019-01-012019-12-310001127703us-gaap:DebtSecuritiesMember2018-01-012018-12-310001127703us-gaap:EquitySecuritiesMember2020-01-012020-12-310001127703us-gaap:EquitySecuritiesMember2019-01-012019-12-310001127703us-gaap:EquitySecuritiesMember2018-01-012018-12-310001127703pra:ShortTermInvestmentsAndOtherInvestedAssetsMember2020-01-012020-12-310001127703pra:ShortTermInvestmentsAndOtherInvestedAssetsMember2019-01-012019-12-310001127703pra:ShortTermInvestmentsAndOtherInvestedAssetsMember2018-01-012018-12-310001127703us-gaap:CashSurrenderValueMember2020-01-012020-12-310001127703us-gaap:CashSurrenderValueMember2019-01-012019-12-310001127703us-gaap:CashSurrenderValueMember2018-01-012018-12-310001127703pra:QualifiedAffordableHousingTaxCreditPartnershipsMember2020-12-310001127703pra:QualifiedAffordableHousingTaxCreditPartnershipsMember2019-12-310001127703pra:OtherTaxCreditPartnershipsMember2020-12-310001127703pra:OtherTaxCreditPartnershipsMember2019-12-310001127703pra:OtherLimitedPartnershipsandLimitedLiabilityCompanyMember2020-12-310001127703pra:OtherLimitedPartnershipsandLimitedLiabilityCompanyMember2019-12-31pra:partnership0001127703pra:TaxCreditPartnershipsAlmost100OwnershipMember2020-12-310001127703srt:MaximumMemberpra:TaxCreditPartnershipsAlmost100OwnershipMember2020-12-310001127703pra:TaxCreditPartnershipsAlmost100OwnershipMember2019-12-310001127703srt:MaximumMemberpra:TaxCreditPartnershipsLessThan20OwnershipMember2020-12-310001127703pra:TaxCreditPartnershipsLessThan20OwnershipMember2020-12-310001127703pra:TaxCreditPartnershipsLessThan20OwnershipMember2019-12-31pra:business0001127703pra:OtherLimitedPartnershipsandLimitedLiabilityCompanyGreaterThan25PercentOwnershipMember2020-12-310001127703pra:OtherLimitedPartnershipsandLimitedLiabilityCompanyGreaterThan25PercentOwnershipMember2019-12-310001127703pra:OtherLimitedPartnershipsandLimitedLiabilityCompanyLessthan25PercentOwnershipMember2020-12-310001127703pra:OtherLimitedPartnershipsandLimitedLiabilityCompanyLessthan25PercentOwnershipMember2019-12-310001127703pra:TaxCreditPartnershipInvestmentTaxCreditCarryforwardMemberpra:TaxYear2040Member2020-12-310001127703pra:TaxCreditPartnershipInvestmentTaxCreditCarryforwardMemberpra:TaxYear2039Member2019-12-31pra:reinsurer0001127703srt:MinimumMember2020-12-310001127703pra:SpecialtyPropertyandCasualtyMember2020-12-310001127703pra:SpecialtyPropertyandCasualtyMember2019-03-310001127703pra:SpecialtyPropertyandCasualtyMember2018-03-310001127703pra:SpecialtyPropertyandCasualtyMember2019-12-310001127703pra:SpecialtyPropertyandCasualtyMember2018-12-310001127703us-gaap:StateAndLocalJurisdictionMember2020-12-310001127703us-gaap:ForeignCountryMember2020-12-310001127703pra:TaxCreditPartnershipInvestmentTaxCreditCarryforwardMember2020-12-310001127703us-gaap:ForeignCountryMember2019-12-310001127703srt:SubsidiariesMember2020-12-310001127703srt:SubsidiariesMember2019-12-310001127703us-gaap:InterestExpenseMember2020-12-310001127703us-gaap:InterestExpenseMember2019-12-31pra:reporting_unit0001127703pra:SpecialtyPropertyandCasualtyMember2020-07-012020-09-3000011277032020-10-012020-12-310001127703pra:SpecialtyPropertyandCasualtyMember2019-12-310001127703pra:WorkersCompensationInsuranceSegmentMember2019-12-310001127703pra:SegregatedPortfolioCellReinsuranceMember2019-12-310001127703pra:SpecialtyPropertyandCasualtyMember2020-01-012020-12-310001127703pra:WorkersCompensationInsuranceSegmentMember2020-01-012020-12-310001127703pra:SegregatedPortfolioCellReinsuranceMember2020-01-012020-12-310001127703pra:SpecialtyPropertyandCasualtyMember2020-12-310001127703pra:WorkersCompensationInsuranceSegmentMember2020-12-310001127703pra:SegregatedPortfolioCellReinsuranceMember2020-12-310001127703pra:SpecialtyPropertyandCasualtyMemberpra:RetroactiveInsuranceContractMember2019-01-012019-12-310001127703pra:SpecialtyPropertyandCasualtyMemberpra:RetroactiveInsuranceContractMember2018-04-012018-06-300001127703pra:SpecialtyPropertyandCasualtyMemberpra:RetroactiveInsuranceContractMember2020-01-012020-12-310001127703srt:MinimumMemberpra:HealthcareProfessionalLiabilityClaimMember2020-01-012020-12-310001127703srt:MaximumMemberpra:HealthcareProfessionalLiabilityClaimMember2020-01-012020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:HealthcareProfessionalLiabilityClaimMember2011-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:HealthcareProfessionalLiabilityClaimMember2012-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:HealthcareProfessionalLiabilityClaimMember2013-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:HealthcareProfessionalLiabilityClaimMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:HealthcareProfessionalLiabilityClaimMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:HealthcareProfessionalLiabilityClaimMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:HealthcareProfessionalLiabilityClaimMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:HealthcareProfessionalLiabilityClaimMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:HealthcareProfessionalLiabilityClaimMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:HealthcareProfessionalLiabilityClaimMember2020-12-31pra:claim0001127703pra:HealthcareProfessionalLiabilityClaimMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2012-12-310001127703pra:HealthcareProfessionalLiabilityClaimMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2013-12-310001127703pra:HealthcareProfessionalLiabilityClaimMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2014-12-310001127703pra:HealthcareProfessionalLiabilityClaimMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2015-12-310001127703pra:HealthcareProfessionalLiabilityClaimMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2016-12-310001127703pra:HealthcareProfessionalLiabilityClaimMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2017-12-310001127703pra:HealthcareProfessionalLiabilityClaimMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2018-12-310001127703pra:HealthcareProfessionalLiabilityClaimMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2019-12-310001127703pra:HealthcareProfessionalLiabilityClaimMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityClaimMember2013-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityClaimMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityClaimMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityClaimMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityClaimMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityClaimMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityClaimMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityClaimMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:HealthcareProfessionalLiabilityClaimMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:HealthcareProfessionalLiabilityClaimMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:HealthcareProfessionalLiabilityClaimMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:HealthcareProfessionalLiabilityClaimMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:HealthcareProfessionalLiabilityClaimMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:HealthcareProfessionalLiabilityClaimMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:HealthcareProfessionalLiabilityClaimMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:HealthcareProfessionalLiabilityClaimMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:HealthcareProfessionalLiabilityClaimMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:HealthcareProfessionalLiabilityClaimMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:HealthcareProfessionalLiabilityClaimMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:HealthcareProfessionalLiabilityClaimMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:HealthcareProfessionalLiabilityClaimMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:HealthcareProfessionalLiabilityClaimMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:HealthcareProfessionalLiabilityClaimMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:HealthcareProfessionalLiabilityClaimMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:HealthcareProfessionalLiabilityClaimMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:HealthcareProfessionalLiabilityClaimMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:HealthcareProfessionalLiabilityClaimMember2017-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:HealthcareProfessionalLiabilityClaimMember2018-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:HealthcareProfessionalLiabilityClaimMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:HealthcareProfessionalLiabilityClaimMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:HealthcareProfessionalLiabilityClaimMember2018-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:HealthcareProfessionalLiabilityClaimMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:HealthcareProfessionalLiabilityClaimMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2019Memberpra:HealthcareProfessionalLiabilityClaimMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2019Memberpra:HealthcareProfessionalLiabilityClaimMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2020Memberpra:HealthcareProfessionalLiabilityClaimMember2020-12-310001127703pra:HealthcareProfessionalLiabilityClaimMember2020-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2011-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2012-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2013-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2014-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2015-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2016-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2017-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2018-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2019-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2020-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2012-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2013-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2014-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2015-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2016-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2017-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2018-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2019-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2013-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2017-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2018-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2018-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2019Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2019Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2020Memberpra:HealthcareProfessionalLiabilityOccurrenceMember2020-12-310001127703pra:HealthcareProfessionalLiabilityOccurrenceMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2011-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2012-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2013-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2012-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2013-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2013-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2017-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2018-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2018-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2019Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2019Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2020Memberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2020-12-310001127703pra:MedicalTechnologyandLifeSciencesProductLiabilityMember2020-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2011-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2012-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2013-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2014-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2015-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2016-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2017-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2018-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2019-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2020-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2012-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2013-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2014-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2015-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2016-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2017-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2018-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2019-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2013-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2017-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2018-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2018-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2019Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2019Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2020Memberus-gaap:AccidentAndHealthInsuranceSegmentMember2020-12-310001127703us-gaap:AccidentAndHealthInsuranceSegmentMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:SegregatedPortfolioCellReinsuranceMember2011-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:SegregatedPortfolioCellReinsuranceMember2012-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:SegregatedPortfolioCellReinsuranceMember2013-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:SegregatedPortfolioCellReinsuranceMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:SegregatedPortfolioCellReinsuranceMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:SegregatedPortfolioCellReinsuranceMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:SegregatedPortfolioCellReinsuranceMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:SegregatedPortfolioCellReinsuranceMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:SegregatedPortfolioCellReinsuranceMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2011Memberpra:SegregatedPortfolioCellReinsuranceMember2020-12-310001127703pra:SegregatedPortfolioCellReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2012-12-310001127703pra:SegregatedPortfolioCellReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2013-12-310001127703pra:SegregatedPortfolioCellReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2014-12-310001127703pra:SegregatedPortfolioCellReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2015-12-310001127703pra:SegregatedPortfolioCellReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2016-12-310001127703pra:SegregatedPortfolioCellReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2017-12-310001127703pra:SegregatedPortfolioCellReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2018-12-310001127703pra:SegregatedPortfolioCellReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2019-12-310001127703pra:SegregatedPortfolioCellReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:SegregatedPortfolioCellReinsuranceMember2013-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:SegregatedPortfolioCellReinsuranceMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:SegregatedPortfolioCellReinsuranceMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:SegregatedPortfolioCellReinsuranceMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:SegregatedPortfolioCellReinsuranceMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:SegregatedPortfolioCellReinsuranceMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:SegregatedPortfolioCellReinsuranceMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberpra:SegregatedPortfolioCellReinsuranceMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:SegregatedPortfolioCellReinsuranceMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:SegregatedPortfolioCellReinsuranceMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:SegregatedPortfolioCellReinsuranceMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:SegregatedPortfolioCellReinsuranceMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:SegregatedPortfolioCellReinsuranceMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:SegregatedPortfolioCellReinsuranceMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:SegregatedPortfolioCellReinsuranceMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:SegregatedPortfolioCellReinsuranceMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:SegregatedPortfolioCellReinsuranceMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:SegregatedPortfolioCellReinsuranceMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:SegregatedPortfolioCellReinsuranceMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:SegregatedPortfolioCellReinsuranceMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:SegregatedPortfolioCellReinsuranceMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:SegregatedPortfolioCellReinsuranceMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:SegregatedPortfolioCellReinsuranceMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:SegregatedPortfolioCellReinsuranceMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:SegregatedPortfolioCellReinsuranceMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:SegregatedPortfolioCellReinsuranceMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:SegregatedPortfolioCellReinsuranceMember2017-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:SegregatedPortfolioCellReinsuranceMember2018-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:SegregatedPortfolioCellReinsuranceMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:SegregatedPortfolioCellReinsuranceMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:SegregatedPortfolioCellReinsuranceMember2018-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:SegregatedPortfolioCellReinsuranceMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:SegregatedPortfolioCellReinsuranceMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2019Memberpra:SegregatedPortfolioCellReinsuranceMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2019Memberpra:SegregatedPortfolioCellReinsuranceMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2020Memberpra:SegregatedPortfolioCellReinsuranceMember2020-12-310001127703pra:SegregatedPortfolioCellReinsuranceMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:LloydsSyndicateMember2014-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:LloydsSyndicateMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:LloydsSyndicateMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:LloydsSyndicateMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:LloydsSyndicateMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:LloydsSyndicateMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2014Memberpra:LloydsSyndicateMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:LloydsSyndicateMember2015-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:LloydsSyndicateMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:LloydsSyndicateMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:LloydsSyndicateMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:LloydsSyndicateMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberpra:LloydsSyndicateMember2020-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:LloydsSyndicateMember2016-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:LloydsSyndicateMember2017-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:LloydsSyndicateMember2018-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:LloydsSyndicateMember2019-12-310001127703us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberpra:LloydsSyndicateMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:LloydsSyndicateMember2017-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:LloydsSyndicateMember2018-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:LloydsSyndicateMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberpra:LloydsSyndicateMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:LloydsSyndicateMember2018-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:LloydsSyndicateMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberpra:LloydsSyndicateMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2019Memberpra:LloydsSyndicateMember2019-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2019Memberpra:LloydsSyndicateMember2020-12-310001127703us-gaap:ShortDurationInsuranceContractAccidentYear2020Memberpra:LloydsSyndicateMember2020-12-310001127703pra:LloydsSyndicateMember2020-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2014-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2015-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2016-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2017-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2018-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2019-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2020-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2015-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2016-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2017-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2018-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2019-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2020-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2016-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2017-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2018-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2019-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2020-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2017-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2018-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2019-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2020-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2018-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2019-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2020-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2019-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2020-12-310001127703pra:LloydsSyndicatePropertyInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2020-12-310001127703pra:LloydsSyndicatePropertyInsuranceMember2020-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2014-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2015-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2016-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2017-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2018-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2019-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2020-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2015-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2016-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2017-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2018-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2019-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2020-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2016-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2017-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2018-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2019-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2020-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2017-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2018-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2019-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Member2020-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2018-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2019-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2020-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2019-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2020-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2020-12-310001127703pra:LloydsSyndicatePropertyReinsuranceMember2020-12-310001127703us-gaap:OtherShortdurationInsuranceProductLineMember2020-12-31iso4217:GBP0001127703pra:LloydsSyndicatesMember2020-12-310001127703pra:LloydsSyndicatesMember2020-01-012020-12-310001127703pra:Syndicate1729Member2020-12-310001127703pra:FundingCommitmentsMember2020-12-310001127703pra:QualifiedAffordableHousingProjectMember2020-12-310001127703pra:DataAnalyticsServicesMember2020-10-012020-10-310001127703pra:DataAnalyticsServicesMember2020-10-310001127703pra:DataAnalyticsServicesMember2020-01-012020-12-310001127703pra:DataAnalyticsServicesMember2019-01-012019-12-310001127703pra:DataAnalyticsServicesMember2020-12-310001127703srt:MaximumMember2020-12-310001127703us-gaap:SeniorNotesMemberpra:Seniornotesdue2023Member2020-12-310001127703us-gaap:SeniorNotesMemberpra:Seniornotesdue2023Member2019-12-310001127703us-gaap:LondonInterbankOfferedRateLIBORMemberus-gaap:MortgagesMember2020-12-310001127703us-gaap:LondonInterbankOfferedRateLIBORMemberus-gaap:MortgagesMember2019-12-310001127703us-gaap:MortgagesMember2020-12-310001127703us-gaap:MortgagesMember2019-12-310001127703us-gaap:SeniorNotesMemberpra:Seniornotesdue2023Memberus-gaap:BaseRateMember2020-01-012020-12-310001127703us-gaap:MortgagesMember2017-01-012017-12-310001127703us-gaap:MortgagesMember2017-12-310001127703us-gaap:RevolvingCreditFacilityMemberus-gaap:LineOfCreditMember2019-12-010001127703us-gaap:RevolvingCreditFacilityMemberus-gaap:LineOfCreditMember2020-12-310001127703srt:MinimumMemberus-gaap:RevolvingCreditFacilityMemberus-gaap:LineOfCreditMember2020-01-012020-12-310001127703us-gaap:RevolvingCreditFacilityMembersrt:MaximumMemberus-gaap:LineOfCreditMember2020-01-012020-12-310001127703us-gaap:RevolvingCreditFacilityMemberus-gaap:LineOfCreditMemberpra:FederalFundsRateMember2020-01-012020-12-310001127703pra:OneMonthLiborMemberus-gaap:RevolvingCreditFacilityMemberus-gaap:LineOfCreditMember2020-01-012020-12-3100011277032020-01-012020-03-3100011277032019-01-012019-03-3100011277032018-01-012018-03-3100011277032020-04-012020-06-3000011277032019-04-012019-06-3000011277032018-04-012018-06-3000011277032019-07-012019-09-3000011277032018-07-012018-09-3000011277032019-10-012019-12-3100011277032018-10-012018-12-310001127703pra:DividendsDeclaredSpecialMember2020-10-012020-12-310001127703pra:DividendsDeclaredSpecialMember2019-10-012019-12-310001127703pra:DividendsDeclaredSpecialMember2018-10-012018-12-310001127703us-gaap:RetainedEarningsUnappropriatedMember2020-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2019-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2019-12-310001127703us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2020-01-012020-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2020-01-012020-12-310001127703us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-01-012020-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2020-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2020-12-310001127703us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2018-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2018-12-310001127703us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2018-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2019-01-012019-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2019-01-012019-12-310001127703us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-01-012019-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2017-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2017-12-310001127703us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2017-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2017-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2017-12-310001127703us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2017-12-310001127703srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2017-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2018-01-012018-12-310001127703us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2018-01-012018-12-310001127703us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2018-01-012018-12-31pra:award0001127703pra:RestrictedStockandPerformanceStockUnitsMember2020-01-012020-12-310001127703us-gaap:RestrictedStockUnitsRSUMember2020-01-012020-12-310001127703pra:EmployeePurchasePlanMember2020-01-012020-12-310001127703us-gaap:RestrictedStockUnitsRSUMember2019-12-310001127703us-gaap:RestrictedStockUnitsRSUMember2018-12-310001127703us-gaap:RestrictedStockUnitsRSUMember2017-12-310001127703us-gaap:RestrictedStockUnitsRSUMember2019-01-012019-12-310001127703us-gaap:RestrictedStockUnitsRSUMember2018-01-012018-12-310001127703us-gaap:RestrictedStockUnitsRSUMember2020-12-310001127703srt:MinimumMemberus-gaap:PerformanceSharesMember2020-01-012020-12-310001127703srt:MaximumMemberus-gaap:PerformanceSharesMember2020-01-012020-12-310001127703us-gaap:PerformanceSharesMember2019-12-310001127703us-gaap:PerformanceSharesMember2018-12-310001127703us-gaap:PerformanceSharesMember2017-12-310001127703us-gaap:PerformanceSharesMember2020-01-012020-12-310001127703us-gaap:PerformanceSharesMember2019-01-012019-12-310001127703us-gaap:PerformanceSharesMember2018-01-012018-12-310001127703us-gaap:PerformanceSharesMember2020-12-310001127703pra:EmployeePurchasePlanMember2019-12-310001127703pra:EmployeePurchasePlanMember2018-12-310001127703pra:EmployeePurchasePlanMember2017-12-310001127703pra:EmployeePurchasePlanMember2019-01-012019-12-310001127703pra:EmployeePurchasePlanMember2018-01-012018-12-310001127703pra:EmployeePurchasePlanMember2020-12-310001127703us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberpra:InvestmentsInUnconsolidatedSubsidiariesMember2020-12-310001127703us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberpra:InvestmentsInUnconsolidatedSubsidiariesMember2019-12-310001127703pra:WorkersCompensationInsuranceSegmentMember2020-12-310001127703pra:SpecialtyPropertyandCasualtyMemberus-gaap:OperatingSegmentsMember2020-01-012020-12-310001127703pra:WorkersCompensationInsuranceSegmentMemberus-gaap:OperatingSegmentsMember2020-01-012020-12-310001127703pra:SegregatedPortfolioCellReinsuranceMemberus-gaap:OperatingSegmentsMember2020-01-012020-12-310001127703pra:LloydsSyndicatesMemberus-gaap:OperatingSegmentsMember2020-01-012020-12-310001127703us-gaap:CorporateMemberus-gaap:OperatingSegmentsMember2020-01-012020-12-310001127703us-gaap:IntersegmentEliminationMember2020-01-012020-12-310001127703us-gaap:MaterialReconcilingItemsMember2020-01-012020-12-310001127703pra:SpecialtyPropertyandCasualtyMemberus-gaap:OperatingSegmentsMember2019-01-012019-12-310001127703pra:WorkersCompensationInsuranceSegmentMemberus-gaap:OperatingSegmentsMember2019-01-012019-12-310001127703pra:SegregatedPortfolioCellReinsuranceMemberus-gaap:OperatingSegmentsMember2019-01-012019-12-310001127703pra:LloydsSyndicatesMemberus-gaap:OperatingSegmentsMember2019-01-012019-12-310001127703us-gaap:CorporateMemberus-gaap:OperatingSegmentsMember2019-01-012019-12-310001127703us-gaap:IntersegmentEliminationMember2019-01-012019-12-310001127703pra:SpecialtyPropertyandCasualtyMemberus-gaap:OperatingSegmentsMember2018-01-012018-12-310001127703pra:WorkersCompensationInsuranceSegmentMemberus-gaap:OperatingSegmentsMember2018-01-012018-12-310001127703pra:SegregatedPortfolioCellReinsuranceMemberus-gaap:OperatingSegmentsMember2018-01-012018-12-310001127703pra:LloydsSyndicatesMemberus-gaap:OperatingSegmentsMember2018-01-012018-12-310001127703us-gaap:CorporateMemberus-gaap:OperatingSegmentsMember2018-01-012018-12-310001127703us-gaap:IntersegmentEliminationMember2018-01-012018-12-310001127703pra:SpecialtyPropertyandCasualtyMemberpra:HCPLMember2020-01-012020-12-310001127703pra:SpecialtyPropertyandCasualtyMemberpra:HCPLMember2019-01-012019-12-310001127703pra:SpecialtyPropertyandCasualtyMemberpra:HCPLMember2018-01-012018-12-310001127703pra:SpecialtyPropertyandCasualtyMemberpra:SmallBusinessUnitMember2020-01-012020-12-310001127703pra:SpecialtyPropertyandCasualtyMemberpra:SmallBusinessUnitMember2019-01-012019-12-310001127703pra:SpecialtyPropertyandCasualtyMemberpra:SmallBusinessUnitMember2018-01-012018-12-310001127703pra:SpecialtyPropertyandCasualtyMemberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2020-01-012020-12-310001127703pra:SpecialtyPropertyandCasualtyMemberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2019-01-012019-12-310001127703pra:SpecialtyPropertyandCasualtyMemberpra:MedicalTechnologyandLifeSciencesProductLiabilityMember2018-01-012018-12-310001127703pra:SpecialtyPropertyandCasualtyMemberpra:OtherPremiumsMember2020-01-012020-12-310001127703pra:SpecialtyPropertyandCasualtyMemberpra:OtherPremiumsMember2019-01-012019-12-310001127703pra:SpecialtyPropertyandCasualtyMemberpra:OtherPremiumsMember2018-01-012018-12-310001127703pra:SpecialtyPropertyandCasualtyMember2020-01-012020-12-310001127703pra:SpecialtyPropertyandCasualtyMember2019-01-012019-12-310001127703pra:SpecialtyPropertyandCasualtyMember2018-01-012018-12-310001127703pra:TraditionalBusinessMemberpra:WorkersCompensationInsuranceSegmentMember2020-01-012020-12-310001127703pra:TraditionalBusinessMemberpra:WorkersCompensationInsuranceSegmentMember2019-01-012019-12-310001127703pra:TraditionalBusinessMemberpra:WorkersCompensationInsuranceSegmentMember2018-01-012018-12-310001127703pra:WorkersCompensationInsuranceSegmentMemberpra:AlternativeMarketBusinessMember2020-01-012020-12-310001127703pra:WorkersCompensationInsuranceSegmentMemberpra:AlternativeMarketBusinessMember2019-01-012019-12-310001127703pra:WorkersCompensationInsuranceSegmentMemberpra:AlternativeMarketBusinessMember2018-01-012018-12-310001127703pra:WorkersCompensationInsuranceSegmentMember2020-01-012020-12-310001127703pra:WorkersCompensationInsuranceSegmentMember2019-01-012019-12-310001127703pra:WorkersCompensationInsuranceSegmentMember2018-01-012018-12-310001127703pra:WorkersCompensationAlternativeMarketBusinessMemberpra:SegregatedPortfolioCellReinsuranceMember2020-01-012020-12-310001127703pra:WorkersCompensationAlternativeMarketBusinessMemberpra:SegregatedPortfolioCellReinsuranceMember2019-01-012019-12-310001127703pra:WorkersCompensationAlternativeMarketBusinessMemberpra:SegregatedPortfolioCellReinsuranceMember2018-01-012018-12-310001127703pra:HCPLMemberpra:SegregatedPortfolioCellReinsuranceMember2020-01-012020-12-310001127703pra:HCPLMemberpra:SegregatedPortfolioCellReinsuranceMember2019-01-012019-12-310001127703pra:HCPLMemberpra:SegregatedPortfolioCellReinsuranceMember2018-01-012018-12-310001127703pra:OtherPremiumsMemberpra:SegregatedPortfolioCellReinsuranceMember2020-01-012020-12-310001127703pra:OtherPremiumsMemberpra:SegregatedPortfolioCellReinsuranceMember2019-01-012019-12-310001127703pra:OtherPremiumsMemberpra:SegregatedPortfolioCellReinsuranceMember2018-01-012018-12-310001127703pra:SegregatedPortfolioCellReinsuranceMember2020-01-012020-12-310001127703pra:SegregatedPortfolioCellReinsuranceMember2019-01-012019-12-310001127703pra:SegregatedPortfolioCellReinsuranceMember2018-01-012018-12-310001127703pra:LloydsSyndicatesMember2019-01-012019-12-310001127703pra:LloydsSyndicatesMember2018-01-012018-12-310001127703srt:MaximumMember2020-01-012020-12-310001127703srt:MinimumMember2020-01-012020-12-310001127703us-gaap:USTreasuryAndGovernmentMember2020-12-310001127703us-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310001127703us-gaap:ForeignGovernmentDebtMember2020-12-310001127703us-gaap:PublicUtilityBondsMember2020-12-310001127703us-gaap:AllOtherCorporateBondsMember2020-12-310001127703us-gaap:AssetBackedSecuritiesMember2020-12-310001127703us-gaap:FixedMaturitiesMember2020-12-310001127703pra:PublicUtilityEquitiesTradingMember2020-12-310001127703pra:BanksTrustsAndInsuranceCompaniesTradingMember2020-12-310001127703pra:IndustrialMiscellaneousAndAllOtherTradingMember2020-12-310001127703us-gaap:EquitySecuritiesMember2020-12-310001127703pra:OtherLongTermInvestmentsFairValueMember2020-12-310001127703us-gaap:ShortTermInvestmentsMember2020-12-310001127703srt:ParentCompanyMember2020-12-310001127703srt:ParentCompanyMember2019-12-310001127703srt:ParentCompanyMember2020-01-012020-12-310001127703srt:ParentCompanyMember2019-01-012019-12-310001127703srt:ParentCompanyMember2018-01-012018-12-310001127703srt:ParentCompanyMember2018-12-310001127703srt:ParentCompanyMember2017-12-310001127703us-gaap:CorporateMember2020-01-012020-12-310001127703us-gaap:CorporateMember2019-01-012019-12-310001127703us-gaap:CorporateMember2018-01-012018-12-31
Table of Contents
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-K
(Mark One)
ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 2020,
or
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from                      to                     .
Commission file number: 001-16533
 ProAssurance Corporation
(Exact name of registrant as specified in its charter)
Delaware63-1261433
(State or other jurisdiction of
incorporation or organization)
(I.R.S. Employer Identification No.)
100 Brookwood Place,Birmingham,AL35209
(Address of principal executive offices)(Zip Code)
(205)877-4400
(Registrant’s telephone number,
including area code)
Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading Symbol(s)Name of each exchange on which registered
Common Stock, par value $0.01 per sharePRANew York Stock Exchange
Securities registered pursuant to Section 12(g) of the Act: None.
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes      No  
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes      No  
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes      No  
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes      No  
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.
Large accelerated filer Accelerated filer 
Non-accelerated filer Smaller reporting company 
Emerging growth company

1

Table of Contents
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section13(a) of the Exchange Act.
Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. Yes      No  
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes      No  
The aggregate market value of voting stock held by non-affiliates of the registrant at June 30, 2020 was $770,102,748.
As of February 19, 2021, the registrant had outstanding approximately 53,893,267 shares of its common stock.
Documents incorporated by reference in this Form 10-K
(i)The definitive proxy statement for the 2021 Annual Meeting of the Stockholders of ProAssurance Corporation (File No. 001-16533) is incorporated by reference into Part III of this report.

2

Table of Contents
Glossary of Terms and Acronyms

When the following terms and acronyms appear in the text of this report, they have the meanings indicated below.
TermMeaning
AADAnnual aggregate deductible
ALAEAllocated loss adjustment expense
AOCIAccumulated other comprehensive income (loss)
ASUAccounting Standards Update
BEATBase erosion anti-abuse tax
BoardBoard of Directors of ProAssurance Corporation
BOLIBusiness owned life insurance
CARES ActCoronavirus Aid, Relief and Economic Security Act
CIMACayman Islands Monetary Authority
Council of Lloyd'sThe governing body for Lloyd's of London
CODMChief Operating Decision Maker
COSOCommittee of Sponsoring Organizations of the Treadway Commission
CommutationAn agreement between a ceding insurer and the reinsurer that provides for the valuation, payment, and complete discharge of all obligations between the parties under a particular reinsurance contract
COVID-19Coronavirus Disease 2019
DDRDeath, disability and retirement
Dodd-Frank ActThe Dodd-Frank Wall Street Reform and Consumer Protection Act
DPACDeferred policy acquisition costs
Eastern ReEastern Re, LTD, S.P.C.
EBUBEarned but unbilled premium
ECO/XPLExtra-contractual obligations/excess of policy limit claims
EEAEuropean Economic Area
ERMEnterprise Risk Management
E&OErrors and Omissions
FALFunds at Lloyd's
FASBFinancial Accounting Standards Board
FHLBFederal Home Loan Bank
FHLMCFederal Home Loan Mortgage Corporation
FIOFederal Insurance Office
FNMAFederal National Mortgage Association
GAAPGenerally accepted accounting principles in the United States of America
GDPRGeneral Data Protection Regulation
GILTI
Global intangible low-taxed income
GNMAGovernment National Mortgage Association
HCPLHealthcare professional liability
IBNRIncurred but not reported
Inova ReInova Re, LTD, S.P.C.
IRSInternal Revenue Service
LAELoss adjustment expense
LIBORLondon Interbank Offered Rate
LLCLimited liability company
Lloyd'sLloyd's of London market
LPLimited partnership

3

Table of Contents
TermMeaning
Medical Technology LiabilityMedical technology and life sciences products liability
Model Holding Co. LawModel Insurance and Holding Company System Regulatory Act and Regulation
Mortgage LoansTwo ten-year mortgage loans collectively with an original borrowing amount of approximately $40 million, each entered into by a subsidiary of ProAssurance
NAICNational Association of Insurance Commissioners
NAVNet asset value
NFIPNational Flood Insurance Program
NOLNet operating loss
NORCALNORCAL Group
NORCAL MutualNORCAL Mutual Insurance Company
NRSRONationally recognized statistical rating organization
NYDFSNew York Department of Financial Services
NYSENew York Stock Exchange
OCIOther comprehensive income (loss)
ORSARisk Management and Own Risk and Solvency Assessment Model Act
PCAOBPublic Company Accounting Oversight Board
PDRPremium deficiency reserve
PICAProAssurance Insurance Company of America
PREP ActThe Public Readiness and Emergency Preparedness Act
ProAssurance PlanExecutive non-qualified excess plan
ProAssurance Savings PlanProAssurance group savings and retirement plan
Revolving Credit AgreementProAssurance's $250 million revolving credit agreement
ROEReturn on equity
ROURight-of-use
SAPStatutory accounting principles
SECSecurities and Exchange Commission
SPASpecial Purpose Arrangement
SPCSegregated portfolio cell
Specialty P&CSpecialty Property and Casualty
Syndicate 1729Lloyd's of London Syndicate 1729
Syndicate 6131Lloyd's of London Syndicate 6131, a Special Purpose Arrangement with Lloyd's of London Syndicate 1729
Syndicate Credit AgreementUnconditional revolving credit agreement with the Premium Trust Fund of Syndicate 1729
TCJATax Cuts and Jobs Act H.R.1 of 2017
TRIAFederal Terrorism Risk Insurance Act
U.K.United Kingdom of Great Britain and Northern Ireland
ULAEUnallocated loss adjustment expense
VIEVariable interest entity


4

Table of Contents
TABLE OF CONTENTS



5

Table of Contents
General Information
Throughout this report, references to "ProAssurance," "PRA," "Company," "we," "us" and "our" refer to ProAssurance Corporation and its consolidated subsidiaries. Because ProAssurance is an insurance holding company and certain terms and phrases common to the insurance industry are used in this report that carry special and specific meanings, we encourage you to read the Glossary of Selected Insurance and Related Financial Terms posted on our website on the Investor Relations page (investor.proassurance.com) under Other Information. In addition, throughout this discussion we use certain terms and abbreviations, which can be found in the Glossary of Terms and Acronyms provided at the beginning of this report.
Caution Regarding Forward-Looking Statements
Any statements in this Form 10-K that are not historical facts are specifically identified as forward-looking statements. These statements are based upon our estimates and anticipation of future events and are subject to significant risks, assumptions and uncertainties that could cause actual results to vary materially from the expected results described in the forward-looking statements. Forward-looking statements are identified by words such as, but not limited to, "anticipate," "believe," "estimate," "expect," "hope," "hopeful," "intend," "likely," "may," "optimistic," "possible," "potential," "preliminary," "project," "should," "will" and other analogous expressions. There are numerous factors that could cause our actual results to differ materially from those in the forward-looking statements. Thus, sentences and phrases that we use to convey our view of future events and trends are expressly designated as forward-looking statements as are sections of this Form 10-K that are identified as giving our outlook on future business.
Forward-looking statements relating to our business include among other things: statements concerning future liquidity and capital requirements, investment valuation and performance, return on equity, financial ratios, net income, premiums, losses and loss reserve, premium rates and retention of current business, competition and market conditions, the expansion of product lines, the development or acquisition of business in new geographical areas, the pricing or availability of acceptable reinsurance, actions by regulators and rating agencies, court actions, legislative actions, payment or performance of obligations under indebtedness, payment of dividends and other matters.
These forward-looking statements are subject to significant risks, assumptions and uncertainties, including, among other things, the following factors that could affect the actual outcome of future events:
changes in general economic conditions, including the impact of inflation or deflation and unemployment;
our ability to maintain our dividend payments;
regulatory, legislative and judicial actions or decisions that could affect our business plans or operations, including changes in interpretations of certain coverages as a result of COVID-19;
the enactment or repeal of tort reforms;
formation or dissolution of state-sponsored insurance entities providing coverages now offered by ProAssurance which could remove or add sizable numbers of insureds from or to the private insurance market;
changes in the interest and tax rate environment, including the actions taken by the federal government and Federal Reserve in response to COVID-19;
resolution of uncertain tax matters and changes in tax laws, including the impact of the CARES Act;
changes in laws or government regulations regarding financial markets or market activity that may affect our business;
changes in the ability, or perception thereof, of the U.S. government to meet its obligations that may affect the U.S. economy and our business;
performance of financial markets affecting the fair value of our investments or making it difficult to determine the value of our investments;
changes in requirements or accounting policies and practices that may be adopted by our regulatory agencies, the FASB, the SEC, the PCAOB or the NYSE that may affect our business;
changes in laws or government regulations affecting the financial services industry, the property and casualty insurance industry or particular insurance lines underwritten by our subsidiaries or by Syndicates 1729 and 6131;
the effect on our insureds, particularly the insurance needs of our insureds, and our loss costs, of changes in the healthcare delivery system and/or changes in the U.S. political climate that may affect healthcare policy or our business;
consolidation of our insureds into or under larger entities which may be insured by competitors, or may not have a risk profile that meets our underwriting criteria or which may not use external providers for insuring or otherwise managing substantial portions of their liability risk;

6

Table of Contents
the effect of cyclical insurance industry trends on our underwriting, including demand and pricing in the
insurance and reinsurance markets in which we operate;
uncertainties inherent in the estimate of our loss and loss adjustment expense reserve and reinsurance recoverable;
changes in the availability, cost, quality or collectability of insurance/reinsurance;
the results of litigation, including pre- or post-trial motions, trials and/or appeals we undertake;
effects on our claims costs from mass tort litigation that are different from that anticipated by us;
allegations of bad faith which may arise from our handling of any particular claim, including failure to settle;
loss or consolidation of independent agents, agencies, brokers or brokerage firms;
changes in our organization, compensation and benefit plans;
changes in the business or competitive environment may limit the effectiveness of our business strategy and impact our revenues;
our ability to retain and recruit senior management and other qualified personnel;
the availability, integrity and security of our technology infrastructure or that of our third-party providers of technology infrastructure, including any susceptibility to cyber-attacks which might result in a loss of information or operating capability;
the impact of a catastrophic event, including the recent COVID-19 pandemic, as it relates to our business and insurance operations, investment results, Lloyd's Syndicates and our insured risks;
the impact of the COVID-19 pandemic and related economic conditions on our premium volume, loss reserves, investment portfolio, asset valuations, business operations and workforce;
the impact of a catastrophic man-made event, such as acts of terrorism, acts of war and civil and political unrest;
the effects of terrorism-related insurance legislation and laws;
guaranty funds and other state assessments;
our ability to achieve continued growth through expansion into new markets or through acquisitions or business combinations;
failure to complete our planned acquisition of NORCAL for any reason including but not limited to failure to obtain required regulatory approvals, or failure of any other condition set forth in the acquisition agreement, or our inability to fund the transaction; and if completed, our failure to successfully integrate NORCAL to achieve expected results or synergies after closing;
changes to the ratings assigned by rating agencies to our holding company or insurance subsidiaries, individually or as a group;
provisions in our charter documents, Delaware law and state insurance laws may impede attempts to replace or remove management or may impede a takeover;
state insurance restrictions may prohibit assets held by our insurance subsidiaries, including cash and investment securities, from being used for general corporate purposes;
taxing authorities can take exception to our tax positions and cause us to incur significant amounts of legal and accounting costs and, if our defense is not successful, additional tax costs, including interest and penalties; and
expected benefits from completed and proposed acquisitions may not be achieved or may be delayed longer than expected due to business disruption; loss of customers, employees or key agents; increased operating costs or inability to achieve cost savings and synergies; and assumption of greater than expected liabilities, among other reasons.
Additional risks, assumptions and uncertainties that could arise from our membership in the Lloyd's market and our participation in Lloyd's Syndicates include, but are not limited to, the following:
members of Lloyd's are subject to levies by the Council of Lloyd's based on a percentage of the member's underwriting capacity, currently a maximum of 3%, but can be increased by Lloyd's;
Syndicate results can be affected by decisions made by the Council of Lloyd's which the management of Syndicate 1729 and Syndicate 6131 have little ability to control, such as a decision to not approve the business plan of Syndicate 1729 or Syndicate 6131, or a decision to increase the capital required to continue operations, and by our obligation to pay levies to Lloyd's;
Lloyd's insurance and reinsurance relationships and distribution channels could be disrupted or Lloyd's trading licenses could be revoked, making it more difficult for a Lloyd's Syndicate to distribute and market its products;

7

Table of Contents
rating agencies could downgrade their ratings of Lloyd's as a whole; and
Syndicate 1729 and Syndicate 6131 operations are dependent on a small, specialized management team, and the loss of their services could adversely affect the Syndicate’s business. The inability to identify, hire and retain other highly qualified personnel in the future could adversely affect the quality and profitability of Syndicate 1729’s or Syndicate 6131's business.
Our results may differ materially from those we expect and discuss in any forward-looking statements. The principal risk factors that may cause these differences are described in "Item 1A, Risk Factors" in this report and other documents we file with the SEC, such as our current reports on Form 8-K and our quarterly reports on Form 10-Q.
We caution readers not to place undue reliance on any such forward-looking statements, which are based upon conditions existing only as of the date made, and advise readers that these factors could affect our financial performance and could cause actual results for future periods to differ materially from any opinions or statements expressed with respect to future periods in any current statements. Except as required by law or regulations, we do not undertake and specifically decline any obligation to publicly release the result of any revisions that may be made to any forward-looking statements to reflect events or circumstances after the date of such statements or to reflect the occurrence of anticipated or unanticipated events.

8

Table of Contents
PART I
ITEM 1. BUSINESS
Overview
ProAssurance Corporation is a holding company for property and casualty insurance companies. For the year ended December 31, 2020, our net premiums written totaled $748 million, and at December 31, 2020 we had total assets of $4.7 billion and $1.3 billion of shareholders' equity.
Our Mission
We exist to Protect Others
Our Vision
We will be the best in the world at understanding and providing solutions for the risks our customers encounter as healers, innovators, employers and professionals. Through an integrated family of specialty companies, products and services, we will be a trusted partner enabling those we serve to focus on their vital work. As the employer of choice, we embrace every day as a singular opportunity to reach for extraordinary outcomes, build and deepen superior relationships, and accomplish our mission with infectious enthusiasm and unbending integrity.
Our Values
Integrity, Leadership, Relationships, Enthusiasm
ProAssurance is a U.S. based specialty property and casualty and workers' compensation insurance carrier. Our specialty property and casualty insurance products primarily include professional liability insurance and liability insurance for medical technology and life sciences risks. We also provide capital to Syndicate 1729 which writes a range of property and casualty insurance and reinsurance lines. In addition, we are a capital provider of an SPA, Syndicate 6131, which focuses on contingency and specialty property business.
Our executive offices are located at 100 Brookwood Place, Birmingham, Alabama 35209 and our telephone number is (205) 877-4400. Our stock trades on the NYSE under the symbol “PRA.” Our website is www.proassurance.com, and we maintain a dedicated Investor Relations section on that website (investor.proassurance.com) to provide specialized resources for investors and others seeking to learn more about us.
As part of our disclosure through the Investor Relations section of our website, we publish our annual report on Form 10-K, our quarterly reports on Form 10-Q and our current reports on Form 8-K and all other public SEC filings as soon as reasonably practicable after the report is electronically filed with, or furnished to, the SEC. These SEC filings can be found on our website at investor.proassurance.com/Docs. This section also includes information regarding stock trading by corporate insiders by providing access to SEC Forms 3, 4 and 5 when they are filed with the SEC. In addition to federal filings on our website, we make available other documents that provide important additional information about our financial condition and operations. Documents available on our website include the financial statements we file with state regulators (compiled under SAP as required by regulation), news releases that we issue, a listing of our investment holdings and certain investor presentations. The Governance section of our website provides copies of the charters for our governing committees and many of our governing policies. Printed copies of these documents may be obtained from our Investor Relations department, either by mail at P.O. Box 590009, Birmingham, Alabama 35259-0009, or by telephone at (205) 877-4400 or (800) 282-6242.
Our History
We were incorporated in Delaware in 2001 as the successor to Medical Assurance, Inc, in conjunction with its merger with Professionals Group, Inc. ProAssurance has a history of growth through acquisitions; the most significant and recent of which was the acquisition of Eastern Insurance Holdings, Inc., on January 1, 2014. On February 20, 2020, we entered into a definitive agreement to acquire NORCAL, an underwriter of medical professional liability insurance, subject to the demutualization of NORCAL Mutual, NORCAL's ultimate controlling party. Upon satisfaction of the various remaining regulatory approvals required, we are anticipating to close the transaction in the second quarter of 2021. If consummated, the transaction will provide strategic and financial benefits including additional scale and geographic diversification in the physician professional liability market.


9

Table of Contents
Our Strategy
We seek to generate an attractive total return for our shareholders while focusing on our culture and people. The basic components of our strategy for achieving this objective are as follows:
Pursue profitable underwriting opportunities. We emphasize profitability, not market share, and strive to achieve a consistent level of underwriting profit over the various economic and insurance cycles. Key elements of our approach are adhering to disciplined underwriting principles, including prudent risk selection and appropriate pricing, as well as adjusting our business mix as necessary to effectively utilize capital and achieve long-term profit objectives.
Focus on culture and people. We strive to be the Employer of Choice by attracting, retaining and developing a diverse group of employees who embody our Mission, Vision and Values. We are committed to fostering an inclusive workplace in which variety of thought, creativity and innovation fuels employee engagement and ultimately increases shareholder return. See further discussion on our employees and culture within this section under the heading "Human Capital Resources."
Provide specialized healthcare-centric expertise to meet evolving demands in the healthcare marketplace. Through our focus on healthcare, we provide traditional liability insurance products to healthcare providers. We also leverage our reach, expertise and financial strength to provide innovative and customized products to meet the risk management needs of larger healthcare organizations or groups.
Provide superior workers' compensation products and services. We provide workers' compensation products and services that focus on increasing an organization's productivity while reducing costs. We do this by providing innovative programs and solutions that address the specific needs of our customers and return injured workers to wellness and the dignity of work.
Provide superior customer service. Our mission statement, "We exist to Protect Others," goes hand-in-hand with our corporate brand promise, "Treated Fairly." Our employees demonstrate our core values of integrity, leadership, relationships and enthusiasm every day and are focused on meeting the needs of our customers.
Focus on operational excellence. Improve our competitive position by focusing on operational excellence and productivity gains by leveraging technology, streamline operations, workflow improvements and proactive expense management.
Effectively manage capital. We carefully monitor use of our capital and consider various options for capital deployment, such as business expansion by our existing subsidiaries, opportunities that arise for mergers or acquisitions, share repurchases and payment of dividends.
Manage claims effectively. Our experienced claims teams have industry and insurance expertise that, with our extensive local knowledge, allows us to resolve claims in an effective manner, considering the circumstances of each claim. When practicable, we utilize formalized claims management processes and protocols as a means of reducing claim costs.
Emphasize risk management. We actively manage our enterprise risk by maintaining strong internal controls. We also emphasize the importance of risk management to our insureds and offer them training in the use of risk reduction tools and techniques.
Maintain a conservative investment strategy. We believe that we follow a conservative investment strategy designed to emphasize the preservation of our capital and provide adequate liquidity for the prompt payment of claims. Our investment portfolio consists primarily of investment-grade, fixed-maturity securities of short-to medium-term duration.
Maintain financial stability. We are committed to maintaining financial strength and adequate capital.
Organization and Segment Information
We operate through multiple insurance organizations and report our financial results in five segments, as follows:
Specialty P&C - This segment includes our professional liability business and medical technology liability business. Our professional liability insurance is primarily comprised of medical professional liability products offered to healthcare providers and institutions. We also offer, to a lesser extent, professional liability insurance to attorneys and their firms. Medical technology liability insurance is offered to medical technology and life sciences companies that manufacture or distribute products including entities conducting human clinical trials. We also offer custom alternative risk solutions including loss portfolio transfers, assumed reinsurance and captive cell programs for healthcare professional liability insureds. For our alternative market captive cell programs, we cede either all or a portion of the premium to certain SPCs in our Segregated Portfolio Cell Reinsurance segment.

10

Table of Contents
Workers' Compensation Insurance - This segment includes our workers' compensation insurance business which is provided generally to employers with 1,000 or fewer employees. Our workers' compensation products include guaranteed cost policies, policyholder dividend policies, retrospectively-rated policies, deductible policies and alternative market solutions. Alternative market solutions include program design, fronting, claims administration, risk management, SPC rental, asset management and SPC management services. Alternative market premiums are 100% ceded to either SPCs in our Segregated Portfolio Cell Reinsurance segment or, to a limited extent, an unaffiliated captive insurer.
Segregated Portfolio Cell Reinsurance - This segment includes the results (underwriting profit or loss, plus investment results, net of U.S. federal income taxes) of SPCs at Inova Re and Eastern Re, our Cayman Islands SPC operations. Each SPC is owned, fully or in part, by an agency, group or association and the results of the SPCs are attributable to the participants of that cell. We participate to a varying degree in the results of selected SPCs and, for the SPCs in which we participate, our participation interest ranges from a low of 20% to a high of 85%. SPC results attributable to external cell participants are reflected as an SPC dividend expense (income) in our Segregated Portfolio Cell Reinsurance segment. The SPCs assume workers' compensation insurance, healthcare professional liability insurance or a combination of the two from our Workers' Compensation Insurance and Specialty P&C segments.
Lloyd's Syndicates - This segment includes the results from our participation in Lloyd's of London Syndicate 1729 and Syndicate 6131. The results of this segment are normally reported on a quarter lag, except when information is available that is material to the current period. Syndicate 6131 is an SPA that underwrites on a quota share basis with Syndicate 1729. Syndicate 1729 underwrites risks over a wide range of property and casualty insurance and reinsurance lines in both the U.S. and international markets while Syndicate 6131 focuses on contingency and specialty property business, also within the U.S. and international markets.
Corporate - This segment includes our investment operations, other than those reported in our Segregated Portfolio Cell Reinsurance and Lloyd's Syndicates segments, interest expense and U.S. income taxes. This segment also includes non-premium revenues generated outside of our insurance entities and corporate expenses.
Gross Premiums Written
Gross premiums written for the years ended December 31, 2020, 2019 and 2018 were comprised as follows:
Year Ended December 31
($ in thousands)202020192018
Specialty P&C (1)
$522,911 61 %$577,700 60 %$577,196 60 %
Workers' Compensation Insurance246,791 29 %278,442 29 %293,230 31 %
Segregated Portfolio Cell Reinsurance (2)
72,843 9 %87,140 %85,086 %
Lloyd's Syndicates (3)
84,718 10 %110,905 11 %88,746 %
Inter-segment revenues (2)(3)
(72,841)(9 %)(86,697)(9 %)(86,947)(9 %)
Total$854,422 100 %$967,490 100 %$957,311 100 %
(1) Primarily comprised of twelve month term policies, but includes premium related to policies with a twenty-four month term of $8.3 million in 2020, $26.9 million in 2019 and $27.4 million in 2018. The majority of renewed twenty-four month term policies were re-underwritten to twelve month term policies as we have ceased offering twenty-four month term policies beginning in the second quarter of 2020.
(2) Premiums in our Segregated Portfolio Cell Reinsurance segment are predominately assumed from either our Workers' Compensation Insurance or Specialty P&C segments. We eliminate this inter-segment revenue.
(3) Our written premium includes our participation in Syndicates 1729 and 6131, including casualty premium assumed in 2018 by Syndicate 1729 from our Specialty P&C segment through a previous quota share reinsurance agreement. We eliminate this inter-segment revenue. There was no premium assumed by Syndicate 1729 from our Specialty P&C segment during 2020 or 2019.
Assets are not allocated to segments because investments, other than the investments that are solely allocated to the Segregated Portfolio Cell Reinsurance and Lloyd's Syndicates segments, and other assets are not managed at the segment level. Additional detailed information regarding premium by individual product type within each of our insurance segments is provided in Item 7, Management's Discussion and Analysis, in the Results of Operations section, under the headings "Premiums Written."
Our insurance exposures are primarily within the U.S. As a result of our participation in Lloyd's Syndicates 1729 and 6131, we had net written premium of $22.6 million in 2020, $32.8 million in 2019 and $29.3 million in 2018 associated with insurance exposures outside of the U.S. In addition, we had net written premium of $11.1 million and $8.8 million in 2020 and 2019, respectively, associated with international insurance exposures within our Specialty P&C segment.

11

Table of Contents
Specialty Property and Casualty Segment
Our Specialty P&C segment focuses on professional liability insurance and medical technology liability insurance. Professional liability insurance is primarily offered to healthcare providers and institutions and, to a lesser extent, to attorneys and their firms. Medical technology liability insurance is offered to medical technology and life sciences companies that manufacture or distribute products including entities conducting human clinical trials.
Professional Liability Insurance
Our professional liability business is primarily focused on providing professional liability insurance to healthcare providers. We target the full spectrum of the HCPL market, covering multiple categories of healthcare professionals, institutions (which includes hospitals, surgery centers and miscellaneous medical facilities) and, to a lesser extent, facilities specializing in long term residential care. While a majority of our business is written in the Standard market, we also offer professional liability insurance on an excess and surplus lines basis through our Specialty line of business; and we offer alternative risk and self-insurance products on a customized basis.
Our custom alternative risk solutions include assumed reinsurance and a loss portfolio transfer program for healthcare entities who, most commonly, are exiting a line of business, changing an insurance approach or simply looking for a more tailored solution for transferring risk. Our custom alternative risk solutions also include a turnkey captive solution whereby we cede all or a portion of the healthcare premium, net of reinsurance, to three SPCs of our wholly owned Cayman Islands reinsurance subsidiaries, Inova Re and Eastern Re, which are reported in our Segregated Portfolio Cell Reinsurance segment. Each SPC is owned, fully or in part, by an agency, group or association, and we currently have a 25% participation interest in the results of one of these three SPCs. See further discussion that follows under the heading "Segregated Portfolio Cell Reinsurance Segment." The portion not ceded to the SPCs is retained within our Specialty P&C segment. Total gross premiums written in this segment in our alternative market captive cell program were approximately $7.1 million, $7.8 million and $5.8 million during 2020, 2019 and 2018, respectively.
We utilize independent agencies and brokers as well as an internal sales force to write our HCPL business. For the year ended December 31, 2020, approximately 76% of our HCPL gross premiums written were produced through independent insurance agencies or brokers. The agencies and brokers we use typically sell through healthcare insurance specialists who are able to convey the factors that differentiate our professional liability insurance products. In 2020, our ten largest agents or brokers produced approximately 32% of our HCPL premium; individually, no one agency or broker produced more than 7% of our HCPL premium.
In marketing our professional liability products we emphasize our financial strength, product flexibility and excellent claims, underwriting and risk resource services. We market our insurance products through our direct sales force and through our agents as well as direct mailings and advertising in industry-related publications. We also are involved in professional societies and related organizations and support legislation that will have a positive effect on healthcare and legal liability issues. We maintain regional underwriting offices which permit us to consistently provide a high level of services to customers on a local basis.
We maintain claim processing centers where our internal claims personnel investigate and monitor the processing of our professional liability claims. We engage experienced, independent litigation attorneys in each venue to assist with the claims process as we believe this practice aids us in providing a defense that is aggressive, effective and cost-efficient. We evaluate the merit of each claim and determine the appropriate strategy for resolution of the claim, either seeking a reasonable good faith settlement appropriate for the circumstances of the claim or aggressively defending the claim. As part of the evaluation and preparation process for HCPL claims, we meet regularly with medical advisory committees in our key markets to examine claims, attempt to identify potentially troubling practice patterns and make recommendations to our staff.
We also provide professional liability coverage to attorneys and their firms in select areas of practice, which is a part of our Small Business Unit. Our legal professional liability coverage is a less significant portion of our business, accounting for approximately 3% of our 2020 gross premiums written. This business offers errors and omissions liability insurance policies for law firms engaged in the private practice of law. The program generally insures solo practitioners and smaller firms; almost all of our insured attorneys are members of a firm employing five or fewer attorneys. The areas of practice of our insured firms include plaintiff, real estate, criminal defense and general corporate law. The program does not insure firms practicing in areas that are considered high hazard such as securities and intellectual property law.
Underwriting decisions for our legal professional liability coverage consider the firm’s areas of practice, the experience of the attorneys and the management controls and loss mitigation practices of the applicant. Our legal professional liability line of business operates in 33 states written through independent brokers. Brokers are appointed and must specialize in legal professional liability. The territory of appointed brokers is restricted to a state or a small number of states in order to maintain a level of exclusivity.

12

Table of Contents
Medical Technology and Life Sciences Insurance
Our medical technology liability business offers products-completed operations liability as well as errors and omissions liability insurance policies, on both a primary and excess basis, for medical technology and life sciences companies. The vast majority of these companies and the products they manufacture and/or distribute are regulated by the U.S. Food and Drug Administration or similar regulatory authorities in foreign jurisdictions. Products insured cover a broad array of medical devices and pharmaceuticals including imaging and non-invasive diagnostic devices, clinical lab instruments, medical instruments and surgical supplies, dental products, orthopedic implants, animal pharmaceuticals and medical devices, durable medical equipment and prescription and over-the-counter drugs. We also provide coverage for sponsors of clinical trials.
Underwriting analysis for medical technology liability encompasses the product's risk profile, loss history, the amount of coverage being sought, level of the insured's retention, expertise and experience of the applicant and the expected volume of product sales. Almost all of our medical technology liability business is written through independent brokers. In 2020, our top ten largest brokers generated approximately 41% of our medical technology liability gross written premium, with no one broker representing more than 9%. We do not appoint agents for our medical technology liability business. We defend our medical technology liability claims vigorously, with a negotiated settlement being the most frequent means of resolution.
Workers' Compensation Insurance Segment
Our Workers' Compensation Insurance segment offers workers' compensation products primarily in 19 core states in the Mid-Atlantic, Southeast, Midwest, Gulf South and New England regions of the continental U.S. Our workers' compensation business consists of two major business activities:
Traditional workers' compensation insurance coverages provided to employers, generally those with 1,000 employees or less. Types of policies offered include guaranteed cost policies, policyholder dividend policies, retrospectively-rated policies and deductible policies.
Alternative market workers' compensation solutions provided to individual companies, groups or associations whereby the workers' compensation premium written is 100% ceded to either the SPCs at Inova Re or Eastern Re, which are reported in our Segregated Portfolio Cell Reinsurance segment, or, to a limited extent, a captive insurer unaffiliated with ProAssurance. Alternative market solutions include program design, fronting, claims administration, risk management, SPC rental, asset management and SPC management services. Of our total alternative market premiums written, approximately 96% in 2020 and 97% in 2019 was ceded to the SPCs at Inova Re and Eastern Re.
All of our workers' compensation products are distributed through a group of appointed independent agents.
We utilize an individual account underwriting strategy for our workers' compensation business that is focused on selecting quality accounts. Our goal is to underwrite a diverse book of business with respect to risk classification, hazard level and geographic location. We target accounts with strong return to wellness and safety programs in primarily low to middle hazard levels such as clerical offices, light manufacturing, healthcare, auto dealers and service industries and maintain a strong risk management unit in order to better serve our customers' needs.
We actively seek to reduce our workers' compensation loss costs by placing a concentrated focus on returning injured workers to wellness and the dignity of work as quickly as possible. We emphasize early intervention and aggressive disability management, utilizing in-house and third-party specialists for case management, including medical cost management. Strategic vendor relationships have been established to reduce medical claim costs and include preferred provider, physical therapy, prescription drug and catastrophic medical services.
Segregated Portfolio Cell Reinsurance Segment
Our Segregated Portfolio Cell Reinsurance segment includes the results (underwriting profit or loss, plus investment results, net of U.S. federal income taxes) of SPCs at Inova Re and Eastern Re, our Cayman Islands SPC operations. Each SPC is owned, fully or in part, by an agency, group or association and the results of the SPCs are attributable to the participants of that cell. We participate to a varying degree in the results of certain SPCs and, for the SPCs in which we participate, our participation interest ranges from a low of 20% to a high of 85% as of December 31, 2020. Each SPC is operated solely for the benefit of its cell participants, and the pool of assets of one SPC are statutorily protected from the creditors of any other SPC. The results of the SPCs are allocated among the cell participants in accordance with the terms of the cell agreements. SPC results attributable to external cell participants are reflected as an SPC dividend expense (income) in our Segregated Portfolio Cell Reinsurance segment. In addition, the Segregated Portfolio Cell Reinsurance segment includes the investment results of the SPCs as the investments are solely for the benefit of the cell participants. The segment results reflect our share of the results of the SPCs in which we participate. The SPCs assume workers' compensation insurance, healthcare professional liability insurance or a combination of the two from our Workers' Compensation Insurance and Specialty P&C segments.

13

Table of Contents
The underwriting, marketing and distribution of policies written in alternative market programs are the same as that of the segment from which the policy was assumed: Workers' Compensation Insurance or Specialty P&C segments.
Lloyd's Syndicates Segment
Our Lloyd's Syndicates segment includes the results from our participation in Syndicates 1729 and 6131. The results of this segment are normally reported on a quarter lag, except when information is available that is material to the current period. Furthermore, investment results associated with investment assets solely allocated to Lloyd's Syndicate operations and certain U.S. paid administrative expenses are reported concurrently as that information is available on an earlier time frame. We have investments in and obligations to Syndicate 1729 and Syndicate 6131 consisting of a Syndicate Credit Agreement, FAL requirements and our participation in results. The Syndicate Credit Agreement was issued for the purpose of providing working capital to Syndicate 1729 with maximum permitted borrowings of £30.0 million. We provide FAL to support underwriting by Syndicate 1729 and Syndicate 6131 which is comprised of investment securities and cash and cash equivalents deposited with Lloyd's with a total fair value of approximately $106.2 million at December 31, 2020. See further discussion on the Syndicate Credit Agreement and our FAL in Note 3 of the Notes to Consolidated Financial Statements. The underwriting capacity of Syndicate 1729 and Syndicate 6131 and our respective participation in each for the 2021 underwriting year is discussed in the following paragraphs.
Lloyd's Syndicate 1729
We provide capital to Syndicate 1729, which covers a range of property and casualty insurance and reinsurance lines in both the U.S. and international markets. The remaining capital for Syndicate 1729 is provided by unrelated third parties, including private names and other corporate members. To support and grow our core insurance operations, we decreased our participation in the results of Syndicate 1729 for the 2021 underwriting year to 5% from 29%. Syndicate 1729's maximum underwriting capacity for the 2021 underwriting year is £185 million (approximately $253 million at December 31, 2020), of which £9 million (approximately $13 million at December 31, 2020) is our allocated underwriting capacity.
Lloyd's Syndicate 6131
We provide capital to Syndicate 6131, which focuses on contingency and specialty property business, primarily for risks within the U.S. as well as international markets. As an SPA, Syndicate 6131 underwrites on a quota share basis with Syndicate 1729. Effective July 1, 2020, Syndicate 6131, entered into a six-month quota share reinsurance agreement with an unaffiliated insurer. Under this agreement, Syndicate 6131 ceded essentially half of the premium assumed from Syndicate 1729 to the unaffiliated insurer; the agreement was non-renewed on January 1, 2021 and we decreased our participation in the results of Syndicate 6131 to 50% from 100% for the 2021 underwriting year. Syndicate 6131's maximum underwriting capacity for the 2021 underwriting year is £20 million (approximately $27 million at December 31, 2020), of which £10 million (approximately $14 million at December 31, 2020) is our allocated underwriting capacity.
Our Lloyd's Syndicates segment products are distributed principally through retail brokers and coverholders (i.e., only those authorized by our retail brokers to enter into a contract but only in accordance with specified terms), which consist primarily of premium written through open-market channels and delegated underwriting authority arrangements. Our Lloyd's Syndicates write business in the Lloyd's marketplace and have access to international markets across the world.
Corporate Segment
Our Corporate segment includes our investment operations, other than those reported in our Segregated Portfolio Cell Reinsurance and Lloyd's Syndicates segments, interest expense and U.S. income taxes. The segment also includes non-premium revenues generated outside of our insurance entities and corporate expenses. We apply a consistent management strategy to the entire investment portfolio managed at the corporate level. Accordingly, we report those investment results and net realized investment gains and losses within our Corporate segment. Our overall investment strategy is to maximize current income from our investment portfolio while maintaining safety, liquidity, duration targets and portfolio diversification. The portfolio is generally managed by professional third-party asset managers whose results we monitor and evaluate. The asset managers typically have the authority to make investment decisions within the asset classes they are responsible for managing, subject to our investment policy and oversight, including a requirement that available-for-sale securities in a loss position cannot be sold without specific authorization from us. See Note 3 of the Notes to Consolidated Financial Statements for more information on our investments.
Competition
The marketplace for all our lines of business is very competitive. Within the U.S. our competitors are primarily domestic insurance companies and range from large national insurers whose financial strength and resources may be greater than ours to smaller insurance entities that concentrate on a single state and as a result have an extensive knowledge of the local markets. Additionally, there are many providers, domestic and international, of alternative risk management solutions. Syndicate 1729 and Syndicate 6131, which are based in the U.K., face significant competition from other Lloyd's syndicates as well as other

14

Table of Contents
international and domestic insurance and reinsurance firms operating in the country of the insured. Competitive distinctions include pricing, size, name recognition, service quality, market commitment, market conditions, breadth and flexibility of coverage, method of sale, financial stability, ratings assigned by rating agencies and regulatory conditions.
The changing healthcare environment within the U.S. during the past several years is providing both increased competitive challenges and opportunities for our largest segment, the Specialty P&C segment. Many physicians now practice as employees of larger healthcare entities. Further, healthcare services are increasingly provided by professionals other than physicians and outside of a traditional hospital or clinic setting. Such trends are widely expected to continue. Larger healthcare entities have customer service and risk management needs that differ from the traditional solo or small physician groups. Larger entities are more likely to combine risks such as workers' compensation and professional liability when purchasing insurance and are also more likely to manage all or a part of their risk through alternative insurance mechanisms. We have addressed these issues by enhancing our existing hospital/physician insurance programs, expanding our coverage of healthcare providers other than physician or hospitals, expanding our coverages to include workers' compensation and product liability, and by enhancing our customer service capabilities, particularly with regard to the needs of larger accounts. We continue to focus on offering unique, joint or cooperative insurance programs that are attractive to larger healthcare entities.
The workers’ compensation industry is highly competitive in the geographic markets in which we operate. New business opportunities, renewal pricing and retention continue to be a challenge as a result of intense competition, especially from multi-line insurers that are willing to underprice their workers’ compensation products to offset other coverages and we expect this trend to continue in 2021. We believe our product offerings allow us to provide flexibility in offering workers’ compensation solutions to our customers at a competitive price. In addition, we believe that our claims handling and risk management services are attractive to our customers and provide us with a competitive advantage even when our pricing is higher than our competitors.
For all of our business, we recognize the importance of providing our products at competitive rates, but we do not price our products at rates that will not permit us to meet our long-term profit targets over the life of the insurance cycle. We base our rates on current loss projections, maintaining a long-term focus even when this approach may reduce our top line growth and result in us not meeting profit targets during certain phases of the insurance cycle. We believe that our size, reputation for effective claims management, unique customer service focus, multi-state presence and broad spectrum of coverages offered provides us with competitive advantages, even as the needs of our insureds change.
Rating Agencies
Our claims paying ability is regularly evaluated and rated by three major rating agencies: A.M. Best, Fitch and Moody’s. In developing their claims paying ratings, these agencies make an independent evaluation of an insurer’s ability to meet its obligations to policyholders. See "Risk Factors" for a table presenting the claims paying ratings of our principal insurance operations.
Our ability to service current debt and potential debt is regularly evaluated and rated by four rating agencies: A.M. Best, S&P, Fitch and Moody’s. These financial strength ratings reflect each agency’s independent evaluation of our ability to meet our obligation to holders of our debt, if any. While financial strength ratings may be of greater interest to investors than our claims paying ratings, these ratings are not evaluations of our equity securities nor a recommendation to buy, hold or sell our equity securities.
Insurance Regulatory Matters
We are subject to regulation under the insurance and insurance holding company statutes of various jurisdictions, including the domiciliary states of our insurance subsidiaries and other states in which our insurance subsidiaries do business. Our insurance subsidiaries are primarily domiciled in the U.S. Our states of domicile include Alabama, Illinois, Michigan, Pennsylvania and Vermont. Our foreign jurisdictions include our reinsurance operations based in the Cayman Islands, a territory of the U.K., and, through our participation in Lloyd's Syndicates, our insurance and reinsurance operations based in the U.K.
United States
Our insurance subsidiaries are required to file detailed annual statements in their states of domicile, with the NAIC and, in some cases, with the state insurance regulators in each of the states in which they do business. The laws of the various states establish agencies with broad authority to regulate, among other things, licenses to transact business, premium rates for certain types of coverage, trade practices, agent licensing, policy forms, underwriting and claims practices, reserve adequacy, transactions with affiliates and insurer solvency. Such regulations may hamper our ability to meet operating or profitability goals, including preventing us from establishing premium rates for some classes of insureds that adequately reflect the level of risk assumed for those classes. Many states also regulate investment activities on the basis of quality, distribution and other quantitative criteria. States have also enacted legislation, typically based in whole or in part on NAIC model laws, which

15

Table of Contents
regulates insurance holding company systems, including acquisitions, the payment of dividends, the terms of affiliate transactions, enterprise risk and solvency management and other related matters.
Applicable state insurance laws, rather than federal bankruptcy laws, apply to the liquidation or reorganization of insurance companies.
Insurance companies are also subject to state and federal legislative and regulatory measures and judicial decisions. These could include new or updated definitions of risk exposure and limitations on business practices.
Insurance Regulation Concerning Change or Acquisition of Control
The insurance regulatory codes in each of the domiciliary states of our operating subsidiaries contain provisions (subject to certain variations) to the effect that the acquisition of “control” of a domestic insurer or of any person that directly or indirectly controls a domestic insurer cannot be consummated without the prior approval of the domiciliary insurance regulator. In general, a presumption of “control” arises from the direct or indirect ownership, control or possession with the power to vote or possession of proxies with respect to 10% (5% in Alabama) or more of the voting securities of a domestic insurer or of a person that controls a domestic insurer. Because of these regulatory requirements, any party seeking to acquire control of ProAssurance or any other domestic insurance company, whether directly or indirectly, would usually be required to obtain such approvals.
In addition, certain state insurance laws contain provisions that require pre-acquisition notification to state agencies of a change in control of a non-domestic insurance company admitted in that state. While such pre-acquisition notification statutes do not authorize the state agency to disapprove the change of control, such statutes do authorize certain remedies, including the issuance of a cease and desist order with respect to the non-domestic admitted insurers doing business in the state if certain conditions exist, such as undue market concentration.
Insurance Regulation Concerning Cybersecurity
In March 2017, the New York Cybersecurity Regulation took effect for financial institutions, insurers and other companies regulated by the NYDFS. The intent of the regulation is to encourage the protection of consumer information, as well as the technology systems of NYDFS regulated entities. We are currently compliant with the regulation according to the transition periods as defined in the NYDFS Cybersecurity Regulation.
In October 2017, the NAIC adopted the Insurance Data Security Model Law, which created rules for insurers, agents and other licensed entities covering data security and investigation and notification of breach. In May 2018, the European Union implemented the GDPR, designed to protect data privacy of individuals within the European Union and the EEA. We are compliant with the GDPR due to the global nature of our business, including a small amount of international activity in our Specialty P&C segment. In addition, managing agents of Lloyd's syndicates are required to ensure that they meet the requirements of the GDPR and any local data protection regulation based on territories in which they operate. Syndicate 1729 and Syndicate 6131, including their managing agent, are compliant with the GDPR.
Each of the domiciliary states of our insurance subsidiaries, excluding Pennsylvania, has enacted data security or data privacy acts. Alabama enacted the Alabama Data Breach Notification Act of 2018 effective June 1, 2018, Illinois enacted the Illinois’ Personal Information Protection Act effective January 1, 2020, Vermont enacted the Data Breach Notification law effective July 1, 2020 and Michigan enacted the Michigan's Data Security Act effective January 20, 2021. Additionally, California's Consumer Privacy Act of 2018 was effective January 1, 2020. These state laws require an information security program based on an ongoing risk assessment, overseeing third-party service providers, investigating data breaches and notifying regulators of a cybersecurity event. The GDPR and the California Consumer Privacy Act of 2018 grant individuals the right to request that a company delete or de-identify their personal information. We expect other states, including our domiciliary state of Pennsylvania, to either adopt the NAIC's Insurance Data Security Model Law or enact their own data security regulations. Moreover, we expect to see privacy laws similar to the California Consumer Privacy Act of 2018 to be enacted in other states, including our states of domicile. We do not expect compliance with the various data security or data privacy acts to have a material impact on our financial condition or results of operations, as they closely resemble the NAIC Model Law, the NYDFS Cybersecurity Regulations and the California Consumer Privacy Act of 2018.
Statutory Accounting and Reporting
Insurance companies are required to file detailed quarterly and annual reports with state insurance regulators in their state of domicile and each of the states in which they do business. Their business and accounts are subject to examination by such regulators at any time. The financial information in these reports is prepared in accordance with SAP. Insurance regulators periodically examine each insurer’s adherence to SAP, financial condition and compliance with insurance department rules and regulations.

16

Table of Contents
Regulation of Dividends and Other Payments from Our Operating Subsidiaries
Our U.S. operating subsidiaries are subject to various state statutory and regulatory restrictions that limit the amount of dividends or distributions an insurance company may pay to its shareholders, including our insurance holding company, without prior regulatory approval. Generally, dividends may be paid only out of unassigned earned surplus. In every case, surplus subsequent to the payment of any dividends must be reasonable in relation to an insurance company’s outstanding liabilities and must be adequate to meet its financial needs.
State insurance holding company regulations generally require domestic insurers to obtain prior approval of extraordinary dividends. Insurance holding company regulations that govern our principal operating subsidiaries deem a dividend as extraordinary if the combined dividends and distributions to the parent holding company in any twelve-month period exceed prescribed thresholds. Such thresholds are statutorily prescribed by the state of domicile and currently are based on either net income for the prior fiscal year (reduced by realized capital gains in certain domiciliary states) or a percentage of unassigned surplus at the end of the prior fiscal year, depending upon the wording of the statute.
If insurance regulators determine that payment of a dividend or any other payments within a holding company group, (such as payments under a tax-sharing agreement or payments for employee or other services) would, because of the financial condition of the paying insurance company or otherwise, be a detriment to such insurance company’s policyholders, the regulators may prohibit such payments that would otherwise be permitted.
Risk-Based Capital and Risk Assessment
In order to enhance the regulation of insurer solvency, each state of domicile in accordance with an NAIC-defined formula specifies risk-based capital requirements for property and casualty insurance companies. At December 31, 2020, all of ProAssurance’s insurance subsidiaries exceeded the minimum required risk-based capital levels.
In late 2010, the NAIC adopted the Model Holding Co. Law. The Model Holding Co. Law, as compared to previous NAIC guidance, increases regulatory oversight of and reporting by insurance holding companies, including reporting related to non-insurance entities, and requires reporting of risks affecting the holding company group. Additionally, in 2012 the NAIC adopted ORSA, which requires insurers to maintain a framework for identifying, assessing, monitoring, managing and reporting on the “material and relevant risks” associated with the insurer's (or insurance group's) current and future business plans. ORSA requires larger insurers, generally those with annual written premium volume greater than $1 billion as a group or $500 million as an individual insurer, to file an internal assessment of solvency with insurance regulators annually beginning in 2015. Although no specific capital adequacy standard is currently articulated in ORSA, it is possible that such standard will be developed over time. The Model Holding Co. Law and ORSA will be binding only if adopted by state legislatures and/or state insurance regulatory authorities and actual regulations adopted by any state may differ from that adopted by the NAIC. As of December 31, 2020, all states have adopted the Model Holding Co. Law and 49 states have adopted ORSA. ProAssurance was not required to file an internal assessment of solvency under the ORSA criteria for the years ended December 31, 2020 or 2019.
Also, the NAIC subsequently revised the Model Holding Co. Law to include provisions which allow regulatory supervision of the holding company group through supervisory colleges and which require reporting of risk and solvency assessments for the group. Certain states in which we operate adopted these revisions early, and we began filing our risk and solvency assessment in 2014.
Investment Regulation
Our operating subsidiaries are subject to state laws and regulations that require diversification of investment portfolios and that limit the amount of investments in certain investment categories. Failure to comply with these laws and regulations may cause non-conforming investments to be treated as non-admitted assets for purposes of measuring statutory surplus and, in some instances, would require divestiture of investments. We monitor the practices used by our operating subsidiaries for compliance with applicable state investment regulations and take corrective measures when deficiencies are identified.
Assessment Funds
Admitted insurance companies are required to be members of guaranty associations which administer state guaranty funds. To fund the payment of claims (up to prescribed limits) against insurance companies that become insolvent, these associations levy assessments on all member insurers in a particular state on the basis of the proportionate share of the premiums written by member insurers in the covered lines of business in that state. Maximum assessments permitted by law in any one year generally vary between 1% and 2% of annual premiums written by a member in that state, although state regulations may permit larger assessments if insolvency losses reach specified levels. Some states permit member insurers to recover assessments paid through surcharges on policyholders or through full or partial premium tax offsets, while other states permit recovery of assessments through the rate filing process. In recent years, participation in guaranty funds has not had a material effect on our results of operations.

17

Table of Contents
Certain states in which we write workers’ compensation insurance have established administrative and/or second injury funds that levy assessments against insurers that write business in their state. The assessments are generally based on insurer’s proportionate share of premiums or losses in a particular state, and the assessment rate can vary from year to year.
Shared Markets
State insurance regulations may force us to participate in mandatory property and casualty shared market mechanisms or pooling arrangements that provide certain insurance coverage to individuals or other entities that are otherwise unable to purchase such coverage in the commercial insurance marketplace. Our operating subsidiaries’ participation in such shared markets or pooling mechanisms is not material to our business at this time.
Federal Regulation
The Dodd-Frank Act was enacted in July 2010 and established additional regulatory oversight of financial institutions. To date, the Dodd-Frank Act has not materially affected our business. However, development of regulations is not complete, and there could yet be changes in the regulatory environment that affect the way we conduct our operations or the cost of compliance, or both.
One of the federal government bodies created by the Dodd-Frank Act was the FIO which in December 2013 released a proposal on insurance modernization and improvement of the system of insurance regulation in the U.S. Although the FIO is prohibited from directly regulating the business of insurance, it has authority to represent the U.S. in international insurance matters and has limited power to preempt certain types of state insurance laws. The proposal advocates significantly greater federal involvement in insurance regulation and identifies necessary reforms by the states to preclude further consideration of direct federal regulation. While the proposal does not necessarily imply that the federal government will displace state regulation completely, it does recommend more of a hybrid approach to insurance regulation. In response to the FIO proposal, the NAIC and a number of state legislatures have considered or adopted legislative proposals that alter and, in many cases, increase the authority of state agencies to regulate insurance companies and insurance holding company systems. We cannot predict whether the proposals will be adopted or what impact, if any, subsequently enacted laws might have on our business, financial condition or results of operations.
In June 2012, Congress passed the Biggert-Waters Bill, which provided for a five-year renewal of the NFIP and, among other things, authorized the Federal Emergency Management Agency to carry out initiatives to determine the capacity of private insurers, reinsurers, and financial markets to assume a greater portion of the flood risk exposure in the U.S. and to assess the capacity of the private reinsurance market to assume some of the program’s risk. In August 2017, the President of the U.S. signed an executive order revoking the establishment of a federal flood risk management standard. In November 2017, the U.S. House of Representatives adopted a bill to reauthorize the NFIP for five years and implement several reforms, including provisions designed to spur additional private insurer involvement in covering flood risk, but the U.S. Senate has yet to vote on the measure. Due to the 2017 hurricane season, Congress adopted a short-term extension to fund the NFIP which has subsequently received multiple short-term extensions and currently expires in September 2021. We cannot predict whether the proposals will be adopted or extended or what impact, if any, subsequently enacted laws might have on our business, financial condition or results of operations.
U.S. Tax Legislation
On December 22, 2017, the President of the U.S. signed the TCJA into law. The TCJA includes significant changes to the U.S. corporate income tax system, including a reduction in the federal corporate rate from 35% to 21% beginning after December 31, 2017, changes to loss reserve discounting factors, limitations on the deductibility of interest expense and executive compensation, and modifications to the taxation of non-U.S. subsidiaries. See further discussion of the impact of the TCJA on our results of operations and financial position provided in Item 7, Management's Discussion and Analysis, in the Critical Accounting Estimates section under the heading "Taxes" or Note 5 of the Notes to Consolidated Financial Statements.
In response to COVID-19, the CARES Act was signed into law on March 27, 2020 and contains several provisions for corporations and eases certain deduction limitations originally imposed by the TCJA. The CARES Act, among other things, includes temporary changes regarding the prior and future utilization of NOLs, temporary changes to the prior and future limitations on interest deductions, temporary suspension of certain payment requirements for the employer portion of Social Security taxes and the creation of certain refundable employee retention credits. See further discussion of the impact of the CARES Act on our results of operations and financial position provided in Item 7, Management's Discussion and Analysis, in the Critical Accounting Estimates section under the heading "Taxes" or Note 5 of the Notes to Consolidated Financial Statements.

18

Table of Contents
Terrorism Risk Insurance Act
TRIA, initially enacted in 2002 and reauthorized in 2007, 2015 and 2019 ensures the availability of insurance coverage for certain acts of terrorism, as defined in the legislation. The 2019 reauthorization extended the program through 2027. TRIA currently provides that during 2021 and in any year thereafter a loss event must exceed $200 million to trigger coverage and that the federal government will reimburse 80% of an insurer’s losses in excess of the insurer’s deductible, up to the maximum annual federal liability of $100 billion. TRIA requires that we offer terrorism coverage to our commercial policyholders in our workers' compensation line of business, for which we may, when warranted, charge an additional premium. The policyholders may or may not accept such coverage.
COVID-19
In response to COVID-19, the federal government and a number of states have introduced or adopted legislation to address issues related to the pandemic. The PREP Act was amended on March 27, 2020 to extend liability immunity for activities related to medical countermeasures against COVID-19, except for claims involving "willful misconduct" as defined in the PREP Act. Certain states have also established immunities for healthcare providers. Depending on the number of states that institute such changes and the terms of the changes, as well as the impact of the amendment to the PREP Act and any related legal challenges, we may experience a reduction in claims frequency and severity for our healthcare professional liability book of business.
With respect to workers' compensation coverages, some states have enacted legislation changes designed to effectively expand coverage by establishing a presumption of compensability for certain types of workers. Other states are considering similar measures. Depending on the number of states that institute such changes and the terms of the changes, we may experience increases in claims frequency and severity for our workers’ compensation book of business, which could have an effect on our financial condition, results of operations and cash flows.
Furthermore, we are closely monitoring the impact of potential legislation or court decisions that could retroactively require insurers to extend certain insurance to cover COVID-19 claims, even if the original contract excluded the cover of communicable diseases as is typical in certain policies; however, to date, legislative attempts have been unsuccessful. If successful, these actions could result in an increase in claim frequency and severity due to an unintended increase in exposure for Syndicate 1729 and 6131 which could have an effect on our financial condition, results of operations and cash flows given our participation in those Syndicates.
International
Cayman Islands
Our SPC business operates through our subsidiaries, Inova Re and Eastern Re, which are organized and licensed as Cayman Islands unrestricted Class B insurance companies. Inova Re and Eastern Re are subject to regulation by the CIMA. Applicable laws and regulations govern the types of policies that Inova Re and Eastern Re can insure or reinsure, the amount of capital they must maintain and the way it can be invested, and the payment of dividends without approval by the CIMA. Inova Re and Eastern Re are required to maintain minimum capital of approximately $200,000 and must receive approval from the CIMA before they can pay any dividends.
United Kingdom
Syndicate 1729 and Syndicate 6131 are regulated in the U.K. by the Prudential Regulation Authority and the Financial Conduct Authority. All Lloyd's Syndicates must also comply with the bylaws and regulations established by the Council of Lloyd's including submission and approval of an annual business plan and maintenance of stipulated capital levels. Also, the Council of Lloyd's may call or assess a percentage of a member's underwriting capacity (currently a maximum of 3%) as a contribution to Lloyd's Central Fund, which, similar to state guaranty funds in the U.S., meets policyholder obligations if a Lloyd's member is otherwise unable to do so.
Effective January 1, 2016, the European Union's executive body, the European Commission, implemented capital adequacy and risk management regulations called Solvency II that applies to businesses within the European Union. Both Syndicate 1729 and Syndicate 6131 follow the Solvency II compliance guidelines set out by the Council of Lloyd's.
On January 31, 2020, the U.K. withdrew from the European Union, commonly referred to as "Brexit", and entered a transition period which lasted until December 31, 2020. Following the transition period, a new trade deal went into effect January 1, 2021 between the U.K. and European Union. In November 2018, Lloyd's opened a new European insurance company in Brussels in order to maintain access to European Union business. Lloyd's Brussels is Lloyd's first Europe wide operation and brings Lloyd's expertise closer to its customers and partners in Europe. As of December 31, 2020, Lloyd's

19

Table of Contents
Brussels has moved all legacy EEA business to Brussels via a Part VII portfolio transfer, which allowed insurers and reinsurers to transfer portfolios of insurance business from one legal entity to another.
Human Capital Resources
We are a people business and we are committed to our employees as well as those individuals whom our employees serve. We aim to attract, develop, and retain a diverse group of employees who embody our Mission, Vision and Values.
We are committed to providing a safe and healthy working environment where all employees are treated with dignity and respect, allowing them to do their best work. Further, we seek to provide equal opportunities while fostering a diverse and inclusive workplace that promotes employee engagement. To ensure our workforce is comprised of a diverse group of highly-qualified individuals, we are committed to advertising job openings and sourcing candidates through broad-reaching techniques. We are committed to a strategy of workforce diversity and inclusion at all levels of the Company, starting with our Board and extending through all levels within our organization. Further, we seek to provide a fulfilling work experience through the creation of well-documented career paths and opportunities for advancement, robust training and development programs and the management of transparent salary administration practices. Our competitive pay and benefit programs are designed to reward, support and retain our employees.
We are committed to facilitating and fostering employee engagement. To support those objectives, we measure employee engagement and satisfaction by conducting “Pulse” surveys that gain real-time feedback from our employees on key issues. The results are shared with all employees and the data is used to steer our continuous improvement efforts. We regularly monitor and evaluate turnover metrics to ensure we are responsive to the evolving, competitive market for top talent.
In the event of downsizing and lay-offs are necessary, we provide favorable severance packages that include support of re-employment. During 2020, in response to the external environment and to improve our future competitive position, we restructured our Specialty P&C and Workers' Compensation Insurance segments to better serve our policyholders and agency partners. As a result, we transformed our workforce through a combination of early retirement, job eliminations, reassignments and promotions that spanned our entire organization.
Some examples of key programs and initiatives that are focused on attracting, developing and retaining our diverse workforce include:
Diversity, Equity and Inclusion - To advance our commitment to fostering a diverse, inclusive and equitable workplace, in 2020 we engaged an external professional services partner to help guide the identification of short and long-term strategies. One specific strategy is the formation of a Diversity, Equity and Inclusion Council comprised of employees from across the organization who serve as an ongoing resource to the organization in identifying objectives and tracking achievements. We continue to enhance our professional development and training programs to further build knowledge, understanding and skill in support of full cultural competency. We anticipate the development and training aspects of this initiative to be achieved within the first half of 2021.
Employee and Leadership Development - We invest in training and development programs that support our Mission, Vision and Values, encourage continuous learning, equip employees for advancement and encourage a long-term partnership with the Company. We provide career paths for employees to continue to advance their technical skills. To grow the skills of our current managers and plan for future succession needs, we provide a tiered leadership development program, Leadership That Works that includes both in-person group and self-led content.
Employee Health and Welfare - We recognize the importance of a comprehensive benefits strategy to support the unique needs of all employees. We made several key changes in 2020 that address the expanding needs of our employees as a result of the pandemic. We adopted all guidelines of the CARES Act including the retirement plan withdrawal and loan provisions. In addition, we implemented the applicable guidelines of the Families First Coronavirus Response Act. We expanded our virtual health management benefits to include mental well-being and enhanced our accident and critical illness program. In addition, we implemented a new benefit offering which includes access to a service provider that offers assistance and expertise in navigating federal and state programs including social security, disability, unemployment and retirement.
COVID-19 Response - At the onset of the pandemic, we responded by transitioning the majority of our employees to work remotely. As it was safe to do so, we began to allow employees to voluntarily return to the office and implemented mandatory employee training, social distancing, handwashing, daily health questionnaires and other safety measures. We continue to regularly monitor the situation at the highest level of the organization, implementing changes to strategy as appropriate. Returning to the office will continue to be 100% voluntary for the foreseeable future.

20

Table of Contents
ProAssurance Corporation and our subsidiaries are equal opportunity employers and we do not discriminate either directly or indirectly against employees or prospective employees on the basis of race, color, religion, sex, sexual preference/orientation, citizenship, marital status, veteran status, national origin, age or disability, or any other attribute protected by applicable law or regulation. At December 31, 2020, we had 827 employees, none of whom were represented by a labor union. We consider our employee relations to be good.
Enterprise Risk Management
As a property and casualty insurance provider, we are exposed to many risks stemming from both our insurance operations and the environments in which we operate. Since certain risks can be correlated with other risks, an event or a series of events can impact multiple areas of the Company simultaneously and have a material effect on the Company's results of operations, financial position and/or liquidity. In response to these exposures we have implemented an ERM program. Our ERM program consists of numerous processes and controls that have been designed by our senior management with oversight by our Board and implemented across our organization. We utilize our ERM program to identify potential risks from all aspects of our operations and to evaluate these risks in a manner that is both prudent and balanced. Our primary objective is to develop a risk appetite that creates and preserves value for all of our stakeholders.
ITEM 1A. RISK FACTORS.
There are a number of factors, many beyond our control, which may cause results to differ significantly from our expectations. Through our ERM program, as previously discussed, we have attempted to identify and understand the nature, caliber and sensitivity of material foreseeable risks, mitigate or avoid those risks and determine a course of action necessary to address such risks. These risk factors fall under the following four categories: Insurance, Financial, Operational and General. Any factor described in this report could by itself, or together with one or more other factors, have a negative effect on our business, results of operations and/or financial condition. There may be factors not described in this report that could also cause results to differ from our expectations.
Insurance
Insurance market conditions may alter the effectiveness of our current business strategy and impact our revenues.
The property and casualty insurance business is highly competitive. We compete in a fragmented market comprised of many insurers, ranging from smaller single state monoline insurers who have an extensive knowledge of local markets to large national insurers who offer multiple product lines and whose financial strength and resources may be greater than ours. In many instances, coverage we offer is also available through mutual entities whose ROE objectives may be lower than ours. Also, there are many opportunities for self-insurance and for participation in an alternative risk transfer mechanism, such as a captive insurer or a risk retention group.
Competition in the property and casualty insurance business is based on many factors, including premiums charged and other terms and conditions of coverage, services provided, financial ratings assigned by independent rating agencies, claims services, reputation, geographic scope, local presence, agent and client relationships, financial strength and the experience of the insurance company in the line of insurance to be written. Actions of competitors could adversely affect our ability to attract and retain business at current premium levels, impact our market share and reduce the profits that would otherwise arise from operations.
The cyclicality in the property and casualty insurance industry could have a material adverse effect on our ability to improve or maintain underwriting profits or to grow or maintain premium volume.
The insurance and reinsurance markets have historically been cyclical, characterized by extended periods of intense price competition and other periods of reduced competition. The professional liability area has been particularly affected by these cycles. Underwriting cycles are generally driven by an excess of capacity available and actively pursuing business that is deemed profitable. This action drives pricing down. Since the professional liability industry has a long development period, prices typically fall too far resulting in poor underwriting results for a period of time. The reaction is then a withdrawal of capacity, reduced availability of coverage offerings and price increases. In past cycles, these actions improve profitability over a few years inviting new capital into the market again which causes the cycle to repeat. Events other than price can also have a material effect on the duration and depth of the underwriting cycles, such as severity spikes, tort reforms, abrupt frequency changes or reinsurance availability. Changes in the frequency and severity of losses may affect the cycles of the insurance and reinsurance markets significantly. During "soft markets" where price competition is high and underwriting profits are poor, growth and retention of business become challenging which may result in reduced premium volume. During the initial stages of "hard markets", premium volumes rise for existing business and retention levels fall. As more carriers enter this action phase,

21

Table of Contents
underwriting profits begin to improve, although their achievement may take several years to materialize. As the cycle progresses, opportunities may then be presented to grow profitably at the higher premium levels.
The Company's results of operations could be adversely impacted by catastrophes, both natural and man-made, pandemics,
severe weather conditions, climate change or closely related series of events.
Catastrophes can be caused by unpredictable natural events such as hurricanes, windstorms, severe storms, tornadoes, floods, hailstorms, severe winter weather, earthquakes, explosions and fire, and by other natural and man-made events, such as terrorist attacks, civil and political unrest, as well as pandemics and other similar outbreaks in many parts of the world, including the recent outbreak of a coronavirus referred to as COVID-19. Insurance companies are not permitted to reserve for a catastrophe until it has occurred. Although we purchase reinsurance protection for risks we believe bear a significant level of catastrophe exposure, actual losses resulting from a catastrophic event or events may exceed our reinsurance protection. Furthermore, for significant catastrophic exposure, the inability or unwillingness of the reinsurer to make timely payments under the terms of the reinsurance agreement could impact our liquidity. These events may have a material adverse effect on our workforce and business operations as well as the workforce and operations of our insureds and independent agents. Some of the assets in our investment portfolio may be adversely affected by declines in the equity markets, changes in interest rates, reduced liquidity and economic activity caused by large-scale catastrophes, pandemics, terrorist attacks or similar events which could have a material adverse effect on our financial position, results of operations and liquidity.
The incidence, frequency and severity of catastrophes are inherently unpredictable. While we use historical data and modeling tools to assess our potential exposure to catastrophic losses under various conditions and probability scenarios, such assessments do not necessarily accurately predict future losses or accurately measure our potential exposure. The extent of losses from a catastrophe is a function of both the total amount of insured exposure in the area affected by the event and the severity of the event.
Our loss exposure for a terrorist act meeting the TRIA definition is mitigated by our coverage provided by this program as described in Part I under the heading "Insurance Regulatory Matters." Congress has the ability to alter or repeal the provisions of TRIA at its discretion, and if altered or repealed, our exposure could increase and result in premium increases for those types of coverages. Workers' compensation coverages cannot exclude damages related to an act of terrorism, and if TRIA were repealed or the benefits were substantially reduced, this might affect our ability to offer these coverages at a reasonable rate. In addition, the program currently expires at the end of 2027, and the failure to extend the program could adversely affect our business through increased exposure to a catastrophic level of terrorism losses.
Our results of operations and financial condition may be affected if actual insured losses differ from our loss reserves or if actual amounts recoverable under reinsurance agreements differ from our estimated recoverables.
We establish reserves as balance sheet liabilities, representing our estimates of amounts needed to resolve reported and unreported losses and pay related loss adjustment expenses. Our largest liability is our reserve for losses and loss adjustment expenses. Due to the size of our reserve for losses and loss adjustment expenses, even a small percentage adjustment to our reserve can have a material effect on our results of operations for the period in which the change is made.
The process of estimating loss reserves is complex. Significant periods of time may elapse between the occurrence of an insured loss, the reporting of the loss by the insured and payment of that loss. Ultimate loss costs, even for claims with similar characteristics, can vary significantly depending upon many factors including but not limited to the nature of the claim, including whether the claim is an individual or a mass tort claim, the personal situation of the claimant or the claimant’s family, the outcome of jury trials, the legislative and judicial climate where the insured event occurred, general economic conditions and, for claims involving bodily injury, the trend of healthcare costs. Consequently, the loss cost estimation process requires actuarial skill and the application of judgment and such estimates require periodic revision. As part of the reserving process, we review the known facts surrounding reported claims as well as historical claims data and consider the impact of various factors such as:
for reported claims, the nature of the claim and the jurisdiction in which the claim occurred;
trends in paid and incurred loss development;
trends in claim frequency and severity;
emerging economic and social trends;
trends in healthcare costs for claims involving bodily injury;
inflation and levels of employment; and
changes in the regulatory, legal and political environment.
This process assumes that past experience, adjusted for the effects of current developments and anticipated trends, is an appropriate, but not necessarily accurate, basis for predicting future events. There is no precise method for evaluating the impact of any specific factor on the adequacy of reserves, and actual results are likely to differ from original estimates. We evaluate our reserves each period and increase or decrease reserves as necessary based on our estimate of future claims

22

Table of Contents
payments. An increase to reserves has a negative effect on our results of operations in the period of increase; a reduction to reserves has a positive effect on our results of operations in the period of reduction.
Our loss reserves also may be affected by court decisions that expand liability of our policies after they have been issued. As previously discussed under the heading "Insurance Regulatory Matters," we are closely monitoring the impact of potential legislation or court decisions that could effectively expand workers' compensation coverage by establishing a presumption of compensability for certain types of workers which could result in an increase in claim frequency and severity for our workers' compensation book of business. As it relates to our exposures through our participation in Syndicate 1729 and Syndicate 6131, we are also monitoring the impact of potential legislation or court decisions that could retroactively require insurers to extend certain insurance to cover COVID-19 claims, even if the original contract excluded the cover of communicable diseases, which could result in an increase in claim frequency and severity for Syndicate 1729 and Syndicate 6131 due to an unintended increase in exposure. These attempts to date, however, have been unsuccessful. In addition, extension of statutes of limitations in some states could result in assertion of covered claims that otherwise would have been time-barred. We cannot predict the occurrence of such claim, the magnitude of any associated liability if such claims occur, or the effect of such claims on our financial results. Further, a significant jury award or series of awards against one or more of our insureds could require us to pay large sums of money in excess of our reserved amounts. Due to uncertainties inherent in the jury system, any case that is litigated to a jury verdict has the potential to incur a loss that has a material adverse effect on our results of operations.
We purchase reinsurance to mitigate the effect of large losses. Our receivable from reinsurers on unpaid losses and loss adjustment expenses represents our estimate of the amount of our reserve for losses that will be recoverable under our reinsurance programs. We base our estimate of funds recoverable upon our expectation of ultimate losses and the portion of those losses that we estimate to be allocable to reinsurers based upon the terms and conditions of our reinsurance agreements. Given the uncertainty of the ultimate amounts of our losses, our estimates of losses and related amounts recoverable may vary significantly from the eventual outcome. Also, for certain of our reinsurance agreements, we estimate premiums ceded to the reinsurer, subject to certain maximums and minimums, based in part on losses reimbursed or to be reimbursed under the agreement. Due to the size of our reinsurance balances, changes to our estimate of the amount of reinsurance that is due to us could have a material effect on our results of operations in the period for which the change is made.
We use analytical models to assist our decision-making in key areas such as pricing and reserving and may be adversely affected if actual results differ materially from the model outputs and related analyses.
We use various modeling techniques and data analytics to analyze and estimate exposures, loss trends and other risks associated with our assets and liabilities. This includes both proprietary and third party modeled outputs and related analyses to assist us in decision-making (e.g., underwriting, pricing, claims, reserving, reinsurance and catastrophe risk) and to maintain a competitive advantage. Since there is no industry standard for assumptions and preparation of insured data for use in these models, our modeled losses may not be comparable to estimates made by other companies. The modeled outputs and related analyses from both proprietary and third parties are subject to various assumptions, uncertainties, model design errors and the inherent limitations of any statistical analysis, including those arising from the use of historical internal and industry data and assumptions. Changes in the social, judicial or economic environments in which we operate may make modeled outcomes less reliable or produce new, non-modeled risks. In addition, the effectiveness of any model can be degraded by operational risks including, but not limited to, the improper use of the model. Consequently, actual results may differ materially from our modeled results. If actual losses exceed assumptions that were made when our products were priced or our models fail to appropriately estimate the risks we are exposed to, our business, financial condition, results of operations or liquidity may be adversely affected. Furthermore, our results may be adversely affected if actual losses exceed assumptions that were made when pricing products that also include features such as an option to purchase extended reporting endorsement or "tail" coverage, which are offered at rates that are tied to expiring premiums charged. The profitability and financial condition of the Company substantially depends on the extent to which our actual experience is consistent with assumptions we use in our models and ultimate model outputs.
We are exposed to and may face adverse developments involving mass tort claims arising from coverages provided to our insureds.
Establishing reserves for mass tort claims is subject to uncertainties due to many factors, including expanded theories of liability, geographical location and jurisdiction of the lawsuits. Moreover, it is difficult to estimate our ultimate liability for such claims due to evolving judicial interpretations of various tort theories of liability and defense theories, such as federal preemption and joint and several liability, as well as the application of insurance coverage to these claims.
If market conditions cause reinsurance to be more costly or unavailable, we may be required to bear increased risk or reduce the level of our underwriting commitments.
As part of our overall risk and capacity management strategy, we purchase reinsurance for significant amounts of risk underwritten by our insurance subsidiaries. Market conditions beyond our control determine the availability and cost of the

23

Table of Contents
reinsurance. We may be unable to maintain current reinsurance coverage or to obtain other reinsurance coverage in adequate amounts and at favorable rates. If we are unable to renew our expiring coverage or to obtain new reinsurance coverage, either our net exposure to risk would increase or, if we are unwilling to bear an increase in net risk exposures, we would need to reduce the amount of our underwritten risk.
Our claims handling could result in a bad faith claim against us.
We have been sued from time to time for allegedly acting in bad faith during our handling of a claim. The damages claimed in actions for bad faith may include amounts owed by the insured in excess of the policy limits as well as consequential and punitive damages. Awards above policy limits are possible whenever a case is taken to trial. These actions have the potential to have a material and adverse effect on our financial condition and results of operations.
If we are unable to maintain favorable financial strength ratings, it may be more difficult for us to write new business or renew our existing business.
Independent rating agencies assess and rate the claims-paying ability and the financial strength of insurers based upon criteria established by the agencies. Periodically the rating agencies evaluate us to confirm that we continue to meet the criteria of previously assigned ratings. The financial strength ratings assigned by rating agencies to insurance companies represent independent opinions of financial strength and ability to meet policyholder and debt obligations and are not directed toward the protection of equity investors.
Our principal operating subsidiaries hold favorable claims paying ratings with A.M. Best, Fitch and Moody’s. Claims-paying ratings are used by agents, brokers and customers as an important means of assessing the financial strength and quality of insurers. If our financial position deteriorates or the rating agencies significantly change the rating criteria that are used to determine ratings, we may not maintain our favorable financial strength ratings from the rating agencies. A downgrade or involuntary withdrawal of any such rating could limit or prevent us from writing desirable business.
The following table presents the claims paying ratings of our core insurance subsidiaries as of February 19, 2021.
  
Rating Agency (1)
  A.M. Best
(www.ambest.com)
 Fitch
(www.fitchratings.com)
 Moody’s
(www.moodys.com)
ProAssurance Indemnity Company, Inc. A (Excellent) A- (Strong) A3
ProAssurance Casualty Company A (Excellent) A- (Strong) A3
ProAssurance Specialty Insurance Company, Inc. A (Excellent) A- (Strong) NR
ProAssurance Insurance Company of America A (Excellent) A- (Strong) A3
Noetic Specialty Insurance CompanyA (Excellent)A- (Strong)NR
Medmarc Casualty Insurance CompanyA (Excellent)A- (Strong)NR
Lloyd's Syndicate 1729 and Syndicate 6131 (2)
A (Excellent)A- (Strong)NR
Eastern Alliance Insurance CompanyA (Excellent)A- (Strong)A3
Allied Eastern Indemnity CompanyA (Excellent)A- (Strong)A3
Eastern Advantage Assurance CompanyA (Excellent)A- (Strong)NR
Inova Re Ltd., SPCNRNRNR
Eastern Re Ltd., SPCNRNRNR
(1) NR indicates that the subsidiary has not been rated by the listed rating agency.
(2) Rating provided is the rating applicable to all Lloyd's syndicates.
In addition to the evaluation of our claims paying ability, four rating agencies (A.M. Best, S&P, Fitch and Moody’s) evaluate and rate our ability to service current debt and potential debt. These financial strength ratings reflect each agency’s independent evaluation of our ability to meet our obligation to holders of our debt, if any. While these ratings may be of greater interest to investors than our claims-paying ratings, these are not ratings of our equity securities nor a recommendation to buy, hold or sell our equity securities.
Our business could be adversely affected by the loss or consolidation of independent agents, agencies, brokers or brokerage firms.
We heavily depend on the services of independent agents and brokers in the marketing of our insurance products. We face competition from other insurance companies for their services and allegiance. These agents and brokers may choose to direct business to competing insurance companies.

24

Table of Contents
As a member of the Lloyd's market and a capital provider to Lloyd's Syndicate 1729 and Syndicate 6131 we are subject to certain risks which could affect us.
As a participant in Lloyd's Syndicates, we are subject to certain risks and uncertainties, including the following:
reliance on insurance and reinsurance brokers and distribution channels to distribute and market products;
obligation to pay levies to Lloyd's;
obligations to maintain funds to support underwriting activities and risk-based capital requirements that are assessed periodically by Lloyd's and subject to variation;
ability to maintain liquidity to fund claims payments, when due;
ability to obtain reinsurance and retrocessional coverage to protect against adverse loss activity;
reliance on ongoing approvals from Lloyd's and various regulators to conduct business, including a requirement that Annual Business Plans be approved by Lloyd's before the start of underwriting for each account year;
financial strength ratings are derived from the rating assigned to Lloyd's, although they have limited ability to directly affect the overall Lloyd's rating; and
reliance on Lloyd's trading licenses in order to underwrite business outside the U.K.
Financial
We cannot guarantee that our reinsurers will pay in a timely fashion or at all, and as a result, we could experience losses.
We transfer part of our risks to reinsurance companies in exchange for part of the premium we receive in connection with the risk. Although our reinsurance agreements make the reinsurer liable to us to the extent the risk is transferred, our liability to our policyholders remains our responsibility. Reinsurers may periodically dispute our demand for reimbursement from them based upon their interpretation of the terms of our agreements or may fail to pay us for financial or other reasons. If reinsurers refuse or fail to pay us or fail to pay on a timely basis, our financial results and/or cash flows could be adversely affected and could have a material effect on our results of operations in the period in which uncollectible amounts are identified.
At December 31, 2020 our receivable from reinsurers on unpaid losses and loss adjustment expenses was $385 million, our receivable from reinsurers on paid losses and loss adjustment expenses was $14 million and our expected credit losses associated with our reinsurance receivables (related to both paid and unpaid losses) were nominal in amount. As of December 31, 2020, no reinsurer, on an individual basis, had an estimated net amount due which exceeded $51 million.
The impact of the COVID-19 pandemic and related general economic conditions could have a material adverse effect on our results of operations, financial position or liquidity.
The continuing global COVID-19 pandemic has impacted the global economy, financial markets and our results of operations. Because of the size and breadth of this pandemic, all of the direct and indirect consequences of COVID-19 are not yet known and may not emerge for years. Impacts to our results of operations could be widespread and material, including but not limited to, the following:
continued volatility and further disruption in global financial markets that could materially affect our investment portfolio valuations and returns;
declining interest rates which could reduce future investment results;
negative impact on premium volume due to reduced demand and decreased insured exposures due to the impact of COVID-19 on general economic activity, especially for lines of business that are sensitive to rates of economic growth and those that are impacted by audit premium adjustments;
negative impact on expense ratios due to reduced premium volume;
increases in frequency and/or severity of compensable claims, losses litigation and related expenses;
losses from COVID-19 related claims could be greater than our reserves for those losses;
government mandates and/or legislative changes in response to COVID-19, including, but not limited to: actions prohibiting an insurance company from canceling insurance policies in accordance with policy terms; requiring an insurance company to cover losses when its policies specifically excluded coverage or did not provide coverage; preventing an insurance company from filing for a rate increase; ordering an insurance company to provide premium refunds; granting premium grace periods and presumed COVID-19 compensability for all or certain occupational groups;
increased credit risk;
reduced cash flows from premium credits and from our policyholders delaying premium payments;
increased cybersecurity risk as criminals seek new ways to target shifting business models; and
business disruption to independent insurance agents and brokers.

25

Table of Contents
We are taking precautions to protect the safety and well-being of our employees while providing uninterrupted service to our policyholders and claimants. It is not possible at this time to estimate the impact that COVID-19 could have on our results of operations and financial condition, as the impact will depend on future developments, which are highly uncertain and cannot be predicted. Further, to the extent the COVID-19 pandemic adversely affects our business and financial results, it may also have the effect of heightening many of the other risks described herein.
If our businesses do not perform well, we may be required to recognize an impairment of our goodwill or intangible assets, which could have a material adverse effect on our results of operations and financial condition.
We review our definite–lived intangible assets for impairment when events or changes in circumstances indicate that the carrying value may not be recoverable from estimated future cash flows. We test goodwill and intangible assets with indefinite lives for impairment on an annual basis or upon the occurrence of certain triggering events or substantive changes in circumstances that indicate the asset may be impaired. If we determine that such goodwill or intangible assets are impaired, we would be required to write down the goodwill or the intangible asset by the amount of the impairment, with a corresponding charge to net income (loss). Such write downs could have a material adverse effect on our results of operations or financial position.
Our investment results may be impacted by changes in interest rates, U.S. monetary and fiscal policies as well as broader economic conditions.
Changes in interest rates and U.S. fiscal, monetary and trade policies as well as broader economic conditions could have a material adverse effect on our investment results. Fluctuations in the value of our investment portfolio can occur as a result of these changes. Our investment portfolio is primarily comprised of interest-earning assets, marked to fair value each period. Thus, prevailing economic conditions, particularly changes in market interest rates, may significantly affect our results of operations. Significant movements in interest rates potentially expose us to lower yields or lower asset values. Changes in market interest rate levels generally affect our net income (loss) to the extent that reinvestment yields are different than the yields on maturing securities. Changes in interest rates also can affect the value of our interest-earning assets, which are principally comprised of fixed and adjustable-rate investment securities. Generally, the values of fixed-rate investment securities fluctuate inversely with changes in interest rates.
Our investments are subject to credit, prepayment and other risks.
A significant portion of our total assets ($3.4 billion or 73%) at December 31, 2020 are financial instruments whose value can be significantly affected by economic and market factors beyond our control including, among others, the unemployment rate, the strength of the domestic housing market, the price of oil, changes in interest rates and spreads, consumer confidence, investor confidence regarding the economic prospects of the entities in which we invest, corrective or remedial actions taken by the entities in which we invest, including mergers, spin-offs and bankruptcy filings, the actions of the U.S. government and global perceptions regarding the stability of the U.S. economy. Adverse economic and market conditions could cause investment losses or impairment of our securities, which could affect our financial condition, results of operations or cash flows.
At December 31, 2020 approximately 20% of our investment portfolio was invested in mortgage and asset-backed securities. We utilize ratings determined by NRSROs (Moody’s, Standard & Poor’s and Fitch) as an element of our evaluation of the creditworthiness of our securities. The ratings are subject to error by the agencies; therefore, we may be subject to additional credit exposure should the rating be misstated.
Our asset-backed securities are also subject to prepayment risk. A prepayment is the unscheduled return of principal. When rates decline, the propensity for refinancing may increase and the period of time we hold our asset-backed securities may shorten due to prepayments. Prepayments may cause us to reinvest cash proceeds at lower yields than the retired security. Conversely, as rates increase and motivations for prepayments lessen, the period of time over which our asset-backed securities are repaid may lengthen, causing us to not reinvest cash flows at the higher available yields.
At December 31, 2020 the fair value of our state/municipal portfolio was $332.9 million (amortized cost basis of $316.0 million). While our state/municipal portfolio had a high credit rating (AA on average), which indicates a strong ability to pay, there is no assurance that there will not be a credit related event which would cause fair values to decline. An economic downturn could lessen tax receipts and other revenues in many states and their municipalities.
Our tax credit partnership interests are subject to risks related to the potential forfeiture of the tax credits and all or a portion of the previously claimed tax credits. Loss of all or a portion of the tax credits might occur if the property owner fails to meet the specified requirements of planning and constructing or, in the case of the qualified affordable housing project tax credits, fails to operate the property as required or below expected capacity. Changes to tax rates may change the expected duration of the utilization of tax credits. While this would not impact the amount of tax credits we receive, a change in duration could be impactful from an economic perspective due to the time value of money. Additionally, if tax rates were to decrease the

26

Table of Contents
value of losses embedded in our tax credits could decrease due to a lower deduction value, which would reduce the carrying value of the partnership interests and could result in an impairment. At December 31, 2020 the carrying value of our tax credit partnership interests was approximately $27.7 million.
In a period of market illiquidity and instability, the fair values of our investments are more difficult to assess, and our assessments may prove to be greater or less than amounts received in actual transactions.
At December 31, 2020 and in accordance with applicable GAAP, we valued 96% of our investments at fair value and the remaining 4% at cost, equity, or cash surrender value. See Notes 1, 2 and 3 of the Notes to Consolidated Financial Statements for additional information.
We determine the fair value of our investments using quoted exchange or over-the-counter prices, when available. At December 31, 2020, we valued approximately 12% of our investments in this manner. When exchange or over-the-counter quotes are not available, we estimate fair values based on broker dealer quotes and various other valuation methodologies, which may require us to choose among various input assumptions and utilize judgment. At December 31, 2020, approximately 77% of our investments were valued in this manner. When markets exhibit significant volatility, there is more risk that we may utilize a quoted market price, broker dealer quote, valuation technique or input assumption that results in a fair value estimate that is either over or understated as compared to actual amounts that would be received upon disposition of the security. At December 31, 2020, approximately 7% of our investments are investment funds which measure fund assets at fair value on a recurring basis and provide us with a NAV for our interest. As a practical expedient, we consider the NAV provided to approximate the fair value of the interest. NAV is provided by the asset managers, and in some cases, estimates are used for valuation and are subject to variations depending on those estimates. Our funds valued at NAV have various redemption requirements and lock-up provisions (see Note 2 of the Notes to Consolidated Financial Statements for further information).
Our ability to issue additional debt or letters of credit or other types of indebtedness on terms consistent with current debt is subject to market conditions, economic conditions at the time of proposed issuance, results of ratings reviews and the inclusion in certain bond indices of past and future issues. Also, certain of our current debt agreements and loans include financial covenants, and the issuance of debt by one of our insurance subsidiaries requires regulatory approval, both of which may limit or prohibit the issuance of additional debt.
Our Revolving Credit Agreement, which expires in November 2024, permits borrowings of up $300 million. The agreement requires that our consolidated debt to capital ratio (0.17 to 1.0 at December 31, 2020) be 0.35 to 1.0 or less and that we maintain a minimum net worth of $1 billion which represented 65% of consolidated shareholders' equity, excluding AOCI, determined as of June 30, 2019.
During 2017, two of our insurance subsidiaries entered into ten-year mortgage loans. These mortgage loans require each of the subsidiaries to have a leverage ratio of consolidated funded debt to consolidated total capitalization (principally, SAP consolidated net worth plus consolidated funded debt) be 0.35 to 1.0 or less. Furthermore, our insurance subsidiaries must obtain regulatory approval before incurring additional debt.
During 2013, we issued $250 million of unsecured Senior Notes Payable due in 2023 at a 5.3% interest rate. There is no guarantee that additional debt could be issued on similar terms in the future as rates available to us may change due to changes in the economic climate, or shifts in the yield curve may occur, or an increase in our level of debt may result in rating agencies lowering our debt rating.
The interest rates on our Mortgage Loans and Revolving Credit Agreement are priced using a spread over LIBOR, which may be phased out in the future.
LIBOR is the basic rate of interest used in lending between banks on the London interbank market and is widely used as a reference for setting interest rates on loans globally. The terms of certain of our debt agreements include interest rates which are calculated based on LIBOR.
On July 27, 2017, the United Kingdom’s Financial Conduct Authority, which regulates LIBOR, announced that it intends to phase out LIBOR by the end of 2021. It is unclear if at that time whether or not LIBOR will cease to exist or if new methods of calculating LIBOR will be established such that it continues to exist after 2021. On November 30, 2020, the U.S. Federal Reserve announced that it intends for all contracts written with LIBOR benchmarks to end on or before June 30, 2023. The U.S. Federal Reserve, in conjunction with the Alternative Reference Rates Committee, a steering committee comprised of large U.S. financial institutions, announced the replacement of U.S. dollar LIBOR with a new index calculated by short-term repurchase agreements, backed by U.S. Treasury securities called the Secured Overnight Financing Rate (“SOFR”). The first publication of SOFR was released in April 2018 and was subsequently codified by the FASB in October 2018. The updated codification added the overnight index swap rate ("OIS") based on the SOFR to the list of U.S. benchmark interest rates that are eligible to be hedged. During 2020, the FASB issued guidance intended to assist stakeholders during the market-wide reference rate transition period and is effective for a limited period between March 12, 2020 and December 31, 2022. The guidance provides optional

27

Table of Contents
expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions that reference LIBOR or another reference rate that is expected to be discontinued because of reference rate reform.
We have exposure to LIBOR-based financial instruments through our variable rate Mortgage Loans and Revolving Credit Agreement; however, these agreements include provisions for an alternative benchmark rate if LIBOR ceases to exist which do not materially change our liability exposure. Additionally, we have exposure to LIBOR in our available-for-sale fixed maturities portfolio which represented approximately 6% of our total investments, or $191 million, as of December 31, 2020; 34% of these investments with exposure to LIBOR were issued during 2020 or 2019 and include provisions for an alternative benchmark rate. Optional expedients for contract modifications include a prospective adjustment that does not require contract remeasurement or reassessment of a previous accounting determination; therefore, the modified contract is accounted for as a continuation of the existing contract. At this time, we cannot predict the overall effect of the modification or discontinuation of LIBOR or the establishment of alternative benchmark rates.
Resolution of uncertain tax matters and changes in tax laws or taxing authority interpretations of tax laws could result in actual tax benefits or deductions that are different than we have estimated, both with regard to amounts recognized and the timing of recognition. Such differences could affect our results of operations or cash flows.
Our provision for income taxes, our recorded tax liabilities and net deferred tax assets, including any valuation allowances, are recorded based on estimates. These estimates require us to make significant judgments regarding a number of factors, including, among others, the applicability of various federal and state laws, the interpretations given to those tax laws by taxing authorities, courts and the Company, the timing of future income and deductions, and our expected levels and sources of future taxable income. We believe our tax positions are supportable under current tax laws and that our estimates are prepared in accordance with GAAP. Additionally, from time to time, due to changes in economic and/or political conditions, there are changes in tax laws and interpretations of tax laws which could significantly change our estimates of the amount of tax benefits or deductions expected to be available to us in future periods. Specifically, changes in federal tax law as a result of the TCJA included a reduction in the U.S. corporate income tax rate, changes to the cost of cross border reinsurance, changes to the overall tax base and a limitation on the deductibility of certain executive compensation in future periods. Changes to our prior estimates in these cases would be reflected in the period changed and could have a material effect on our effective tax rate, financial position, results of operations and cash flows. As the Company has reinsurance operations domiciled in the Cayman Islands, changes in the tax laws of the Cayman Islands as well as the change in U.S. federal tax law as a result of the TCJA regarding outbound cross border affiliate reinsurance could result in the loss of profitability of that business.
We are subject to U.S. federal and various state income taxes as well as U.K. related taxes. We are periodically under examination by federal, state and local authorities regarding income tax matters, and our tax positions could be successfully challenged; the costs of defending our tax positions could be considerable. Our estimate of our potential liability for known uncertain tax positions is reflected in our financial statements. As of December 31, 2020 we had a net deferred tax asset of approximately $57.1 million and a net federal income tax receivable of approximately $18.9 million, which included a liability for unrecognized current tax benefits of $5.2 million.
Operational
Changes due to financial reform legislation could have a material effect on our operations.
The U.S. federal government generally has not directly regulated the insurance industry except for certain areas of the market, such as insurance for flood, nuclear and terrorism risks. However, the federal government has undertaken initiatives or considered legislation in several areas that may affect the insurance industry. The Dodd-Frank Act was enacted in July 2010 and established additional regulatory oversight of financial institutions (see previous discussion under the heading "Insurance Regulatory Matters"). Our business could be affected by changes to the U.S. system of insurance regulation including legislative or regulatory requirements imposed by or promulgated in connection with the Dodd-Frank Act.
The passage of tort reform or other legislation, and the subsequent review of such laws by the courts could have a material impact on our operations.
Tort reforms generally protect the rights of a defendant by, among other limitations, eliminating certain claims that may be heard in a court, limiting the amount or types of damages, changing statutes of limitation or the period of time to make a claim, and limiting venue or court selection. A number of states in which we do business previously enacted tort reform legislation in an effort to reduce escalating loss trends.
Challenges to tort reform have been undertaken in most states where tort reforms have been enacted, and in some states the reforms have been fully or partially overturned. Additional challenges to tort reform may be undertaken. We cannot predict with any certainty how state appellate courts will rule on these laws. While the effects of tort reform have been generally beneficial to our business in states where these laws have been enacted, there can be no assurance that such reforms will be

28

Table of Contents
ultimately upheld by the courts. Furthermore, if tort reforms are effective, the business of providing professional liability insurance may become more attractive, thereby causing an increase in competition. In addition, the enactment of tort reforms could be accompanied by legislation or regulatory actions that may be detrimental to our business because of expected benefits which may or may not be realized. These expectations could result in regulatory or legislative action limiting the ability of professional liability insurers to maintain rates at adequate levels.
Coverage mandates or other expanded insurance requirements could also be imposed. States may also consider state-sponsored insurance entities that could remove our potential insureds from the private insurance market.
We continue to monitor developments on a state-by-state basis and make business decisions accordingly.
Our performance is dependent on the business, economic, regulatory and legislative conditions of states where we have a significant amount of business.
Our top five states, Pennsylvania, Alabama, Indiana, Texas and Michigan, represented 39% of our direct premiums written for the year ended December 31, 2020. Moreover, on a combined basis, Pennsylvania, Alabama and Indiana accounted for 28% of our direct premiums written for each of the years ended December 31, 2020, 2019 and 2018. Unfavorable business, economic or regulatory conditions in any of these states could have a disproportionately greater effect on us than they would if we were less geographically concentrated.
From time to time we may identify opportunities for growth through acquisitions. However, approval of acquisitions may not be granted or conditions of approval may adversely alter the expected value and benefits of the acquisition. In addition, expected benefits from acquisitions may not be achieved or may be delayed longer than expected.
Growth through the acquisition of other companies or books of business is opportunistic and sporadic. If we are able to identify a target for acquisition, state insurance regulation concerning change or acquisition of control could delay or prevent us from completing the acquisition. State insurance regulatory codes provide that the acquisition of “control” of a domestic insurer or of any person that directly or indirectly controls a domestic insurer cannot be consummated without the prior approval of the domiciliary insurance regulator. There is no assurance that we will receive such approval from the respective insurance regulator or that such approvals will not be conditioned in a manner that materially and adversely affects the aggregate economic value and business benefits expected to be obtained and cause us to not complete the acquisition.
The Company performs thorough due diligence before agreeing to a merger or acquisition; however, there is no guarantee that the procedures we perform will adequately identify all potential weaknesses or liabilities of the target company or potential risks to the consolidated entity.
There is also no guarantee that businesses acquired in the future will be successfully integrated. Ineffective integration of our businesses and processes may result in substantial costs or delays and adversely affect our ability to compete. The process of integrating an acquired company or business can be complex and costly and may create unforeseen operating difficulties including the ineffective integration of underwriting, risk management, claims handling, finance, information technology and actuarial practices and the design and operation of internal controls over financial reporting. Difficulties integrating an acquired business may also result in the acquired business performing differently than we expected including the loss of customers or in our failure to realize anticipated growth or expense-related efficiencies. We could be adversely affected by the acquisition due to unanticipated performance issues and additional expense, unforeseen or adverse changes in liabilities, including liabilities arising from events prior to the acquisition or that were unknown to us at the time of the acquisition, transaction-related charges, diversion of management time and resources to integration challenges, loss of key employees, regulatory requirements, exposure to tax liabilities, exposure to pension liabilities, amortization of expenses related to intangibles, and charges for impairment of assets or goodwill.
Furthermore, claims may be asserted by either the policyholders or shareholders of any acquired entity related to payments or other issues associated with the acquisition and merger into the consolidated entity. Such claims may prove costly or difficult to resolve or may have unanticipated consequences.
There are numerous risks and uncertainties around the Company's planned acquisition of NORCAL.
On February 20, 2020 we entered into a definitive agreement to acquire NORCAL, an underwriter of medical professional liability insurance, subject to the demutualization of NORCAL Mutual, NORCAL's ultimate controlling party. See Note 9 of the Notes to Consolidated Financial Statements for further information. If consummated, the transaction will provide strategic and financial benefits including additional scale and geographic diversification in the physician professional liability market and is expected to be accretive to earnings over time; nevertheless, there are numerous risks and uncertainties around the transaction. The completion of our planned acquisition of NORCAL is subject to a number of conditions, including required regulatory approvals. The failure to satisfy all the required conditions could prevent the acquisition from occurring. In addition, regulators could impose additional requirements or obligations as conditions for their approval. We can provide no assurance that we will obtain the necessary approvals within the estimated timeframe or at all, or that any such requirements that are

29

Table of Contents
imposed by regulators would not result in the termination of the transaction. Investors’ reactions to a failure to complete the acquisition of NORCAL, including possible speculation about alternative uses of capital, may cause volatility in our stock price. A failure to complete a proposed transaction of this nature could also result in litigation by ProAssurance stockholders or by NORCAL or its policyholders asserting monetary harm due to the failure of the transaction.
In addition, even if we complete the proposed NORCAL acquisition, we may not be able to successfully integrate NORCAL into our business and therefore may not be able to achieve expected synergies. Furthermore, the significant disruptions on global financial markets as a result of the COVID-19 pandemic could impact the future operating performance of NORCAL negatively, as well as negatively impact the fair value of its assets and liabilities. Therefore, our liquidity may be adversely impacted should NORCAL's operating performance deteriorate, requiring our holding company to infuse capital into NORCAL or preventing the ability to distribute capital from NORCAL to our holding company due to regulatory restrictions or other reasons.
In early 2021, we plan to finance a portion of our acquisition of NORCAL. Our ability to arrange additional financing or refinancing will depend on, among other factors, our financial position and performance, as well as prevailing market conditions and other factors beyond our control. There can be no assurance that we will be able to obtain additional financing or refinancing, if needed, on terms acceptable to us or at all. If we are not able to access capital on acceptable terms, we may encounter difficulty funding the transaction, our business requirements, including debt repayments when they become due, or both. In addition, due to the impacts of the COVID-19 pandemic, we could experience loss of revenue and profits due to delayed payments or insolvency of insureds facing liquidity issues as well as lower yields on our investment portfolio. As a result, we may be compelled to take additional measures to preserve our cash flow, including the reduction of operating expenses or reduction or suspension of dividend payments, at least until the impacts of the COVID-19 pandemic improve. Further, the COVID-19 pandemic’s potential disruption to our business operations may require us to access our Revolving Credit Agreement which we have anticipated utilizing to partially fund the NORCAL transaction. Thus, we may be required to raise additional financing to fund working capital, capital expenditures, acquisitions or other general corporate requirements.
Increased levels of indebtedness associated with the NORCAL transaction or due to meeting our operational needs could make us more vulnerable to general adverse economic, regulatory and industry conditions in a period of uncertainty and volatility. This indebtedness could have the effect, among other things, of reducing our flexibility to respond to changing business and economic conditions and increasing interest expense. The increased levels of indebtedness following completion of the acquisition could also reduce funds available for working capital, capital expenditures, acquisitions and other general corporate purposes and may create competitive disadvantages relative to other companies with lower debt levels. If we do not achieve the expected benefits and cost savings from the NORCAL acquisition, or if the financial performance of the combined company does not meet current expectations, our ability to service our indebtedness may be adversely impacted.
Any of these events could materially adversely affect our business, financial condition, results of operations, cash flows, liquidity and stock price.
Our success is dependent upon our ability to adequately and appropriately serve our customers.
The operations of the Company are heavily dependent upon the delivery of superior customer service across a broad customer base, by which negative feedback from agents, brokers, insureds or internal staff could result in a loss of revenue for the Company.
Provisions in our charter documents, Delaware law and state insurance law may impede attempts to replace or remove management or may impede a takeover, which could adversely affect the value of our common stock.
Our certificate of incorporation, bylaws and Delaware law contain provisions that may have the effect of inhibiting a non-negotiated merger or other business combination. As of December 31, 2020, we currently have no preferred stock outstanding. In addition, our Corporate Governance Principles provide that the Board, subject to its fiduciary duties, will not issue any series of preferred stock for any defense or anti-takeover purpose, for the purpose of implementing any stockholders rights plan, or with features intended to make any acquisition more difficult or costly without obtaining stockholder approval. However, because the rights and preferences of any series of preferred stock may be set by the Board in its sole discretion, the rights and preferences of any such preferred stock may be superior to those of our common stock and thus may adversely affect the rights of the holders of common stock.
The voting structure of common stock and other provisions of our certificate of incorporation are intended to encourage a person interested in acquiring us to negotiate with and to obtain the approval of the Board in connection with a transaction. However, certain of these provisions may discourage our future acquisition, including an acquisition in which stockholders might otherwise receive a premium for their shares. As a result, stockholders who might desire to participate in such a transaction may not have the opportunity to do so.

30

Table of Contents
In addition, state insurance laws provide that no person or entity may directly or indirectly acquire control of an insurance company unless that person or entity has received approval from the insurance regulator. An acquisition of control of ProAssurance would be presumed if any person or entity acquires 10% (5% in Alabama) or more of our outstanding common stock, unless the applicable insurance regulator determines otherwise. These provisions apply even if the offer may be considered beneficial by stockholders.
We are a holding company and are dependent on dividends and other payments from our operating subsidiaries, which may be subject to dividend restrictions.
We are a holding company whose principal source of external revenue is our investment revenues. In addition, cash dividends and other permitted payments from operating subsidiaries represent another source of funds. If our subsidiaries are unable to make payments to us, or are able to pay only limited amounts, we may be unable to make payments on our indebtedness, meet other holding company financial obligations, or pay dividends to shareholders. The payment of dividends by these operating subsidiaries is subject to restrictions set forth in the insurance laws and regulations of their respective states of domicile, as discussed in Item I under the heading "Insurance Regulatory Matters."
Regulatory requirements or changes to regulatory requirements could have a material effect on our operations.
Our insurance businesses are subject to extensive regulation by state insurance authorities in each state in which they operate. Regulation is intended for the benefit of policyholders rather than shareholders. In addition to the amount of dividends and other payments that can be made to a holding company by insurance subsidiaries, these regulatory authorities have broad administrative and supervisory power relating to:
licensing requirements;
trade practices;
capital and surplus requirements;
investment practices; and
rates charged to insurance customers.
These regulations may impede or impose burdensome conditions on rate changes or other actions that we may desire to take in order to enhance our results of operations. In addition, we may incur significant costs in the course of complying with regulatory requirements. Most states also regulate insurance holding companies like us in a variety of matters such as acquisitions, solvency and risk assessment, changes of control and the terms of affiliated transactions.
Also, certain states sponsor insurance entities which affect the amount and type of liability coverages purchased in the sponsoring state. Changes to the number of state sponsored entities of this type could result in a large number of insureds changing the amount and type of coverage purchased from private insurance entities such as ProAssurance.
We own two subsidiaries domiciled in the Cayman Islands and subject to the laws of the Cayman Islands and regulations promulgated by the CIMA. Failure to comply with these laws, regulations and requirements could result in consequences ranging from a regulatory examination to a regulatory takeover of our Cayman Islands subsidiaries, which could potentially impact profitability of alternative market solutions offered through these subsidiaries.
Syndicate 1729 and Syndicate 6131 are regulated in the U.K. by the Prudential Regulation Authority and the Financial Conduct Authority. All Lloyd's Syndicates must also comply with the bylaws and regulations established by the Council of Lloyd's. Failure to comply with bylaws and regulations could affect our ability to underwrite as a Lloyd's Syndicate in the future and therefore affect our profitability. Changes in bylaws and regulations could also affect the profitability of the operations.
Effective January 1, 2016, the European Union's executive body, the European Commission, implemented capital adequacy and risk management regulations called Solvency II that apply to businesses within the European Union. Syndicate 1729 and Syndicate 6131 follow the Solvency II compliance guidelines set out by the Council of Lloyd's.
The assessments that we are required to pay to state associations may increase or our participation in mandatory risk retention pools could be expanded and our results of operations and financial condition could suffer as a result.
Each state in which we operate has separate insurance guaranty fund laws requiring admitted property and casualty insurance companies doing business within their respective jurisdictions to be members of their guaranty associations. These associations are organized to pay covered claims (as defined and limited by the various guaranty association statutes) under insurance policies issued by insurance companies that have become insolvent. Most guaranty association laws enable the associations to make assessments against member insurers to obtain funds to pay covered claims after a member insurer becomes insolvent. These associations levy assessments (up to prescribed limits) on all member insurers in a particular state on the basis of the proportionate share of the premiums written by member insurers in the covered lines of business in that state. Maximum assessments generally vary between 1% and 2% of annual premiums written by a member in that state. Some states

31

Table of Contents
permit member insurers to recover assessments paid through surcharges on policyholders or through full or partial premium tax offsets, while other states permit recovery of assessments through the rate filing process. We had no significant guaranty fund recoupments or assessments in 2020, 2019 or 2018. Our practice is to accrue for insurance insolvencies when notified of assessments. We are not able to reasonably estimate assessments or develop a meaningful range of possible assessments prior to notice because the guaranty funds do not provide sufficient information for development of such estimates or ranges.
Certain states in which we write workers’ compensation insurance have established administrative and/or second injury funds that levy assessments against insurers that write business in their state. The assessments are generally based on an insurer’s proportionate share of premiums or losses in a particular state, and the assessment rate can vary from year to year.
Risk pooling mechanisms have been established in certain states that offer insurance coverage to individuals or entities who are otherwise unable to purchase coverage from private insurers. Authorized property and casualty insurers in these states are generally required to share in the underwriting results of these pooled risks, which are typically adverse. Should our mandatory participation in such pools be increased or if the assessments from such pools increased, our results of operations and financial condition would be negatively affected, although that was not the case in 2020, 2019 or 2018.
Our Board may decide that our financial condition does not allow the continued payment of a quarterly cash dividend, or requires that we reduce the amount of our quarterly cash dividend.
Our Board approved a cash dividend policy in September 2011, and we most recently paid a $0.05 per share dividend for the three months ended December 31, 2020. However, any decision to pay future cash dividends is subject to the Board’s final determination after a comprehensive review of the Company’s financial performance, future expectations and other factors deemed relevant by the Board.
The operations of the Company are heavily reliant upon the Company's reputation as an ethical business organization providing needed services to its customers.
The Company's positive reputation is critical to its role as an insurance provider and as a publicly traded company. The Board adopted a Code of Ethics and Conduct, and management is heavily focused on the integrity of our employees and third-party suppliers, agents or brokers. Illegal, unethical or fraudulent activities perpetrated by an employee or one of our third-party agencies or brokers for personal gain could expose the Company to a potential financial loss.
A natural disaster or pandemic event, or closely related series of events, could cause loss of lives or a substantial loss of property or operational ability at one or more of the Company's facilities.
The Company's disaster preparedness encompasses our Business Continuity Plan, Disaster Recovery Plan, Operations Plan and Pandemic Response Plan. Our disaster preparedness is focused on maintaining the continuity of the Company's data processing and telephone capabilities as well as the use of alternate and temporary facilities in the event of a natural disaster or medical event. The Company's plans are reviewed during the insurance department examinations of the statutory insurance companies. While the Company has plans in place to respond to both short- and long-term disaster scenarios, the loss of certain key operating facilities or data processing capabilities could have a significant impact on Company operations.
The operations of the Company are dependent upon the security, integrity and availability of our internal technology infrastructure and that of certain third parties. Any significant disruption of these infrastructures could result in unauthorized access to Company data or reduce our ability to conduct business effectively, or both.
The Company is dependent upon its technology infrastructure and that of certain third parties to operate and report financial and other Company information accurately and timely. We collect, use, store or transmit an increasingly large amount of confidential, proprietary and other information in connection with the operation of our business. Therefore, the Company has focused resources on securing and preserving the integrity of our data processing systems and related data. Despite our efforts to ensure the integrity of our systems, we are increasingly exposed to the risk that our technology infrastructure could be subject to cyber-attacks and unauthorized access, such as physical and electronic break-ins or unauthorized tampering.
The Company also evaluates the integrity and security of the technology infrastructure of third parties that access, process or store data that the Company considers to be significant. While we review and assess our third party providers' cybersecurity controls, as appropriate, and make changes to our business processes to manage these risks, there is no guarantee that measures taken to date will completely prevent possible disruption, damage or destruction by intentional or unintentional acts or events such as cyber-attacks, viruses, sabotage, human error, system failure or the occurrence of numerous other human or natural events.
Disruption, damage or destruction of any of our systems or data could cause our normal operations to be disrupted, or unauthorized internal or external knowledge or misuse of confidential Company data could occur, all of which could be harmful to the Company from a financial, legal and reputational perspective. We continually enhance our cyber and information security in order to identify and neutralize emerging threats and improve our ability to prevent, detect and respond to attempts to gain

32

Table of Contents
unauthorized access to our data and systems. We regularly add additional security measures to our computer systems and network infrastructure to mitigate the possibility of cybersecurity breaches, including firewalls and penetration testing. However, it is impossible to defend against every risk being posed by changing technologies. The Company has a formal process in place for identifying, handling and disclosing of cybersecurity incidents. In addition, the Company's Board and Audit Committee are involved in the oversight of our cybersecurity policies and procedures and are continually updated on material cybersecurity risks and cybersecurity issues, if any, faced by executive management. To date, the Company is not aware of any material harm or loss relating to cyber-attacks or other security breaches at the Company or its third parties.
General
We are subject to numerous NYSE and SEC regulations including insider trading regulations, Regulation FD and regulations requiring timely and accurate reporting of our operating results as well as certain events and transactions. Noncompliance with these regulations could subject us to enforcement actions by the NYSE or the SEC, and could affect the value of our shares and our ability to raise additional capital.
The Company carefully adheres to NYSE and SEC requirements as the loss of trading privileges on the NYSE or an SEC enforcement action could have a significant financial impact on the Company. Failure to comply with various SEC reporting and record keeping requirements could result in a decline in the value of our stock or a decline in investor confidence which could directly impact our ability to efficiently raise capital. Failure to adhere to NYSE requirements could result in fines, trading restrictions or delisting.
In June 2020, a putative class action lawsuit was filed against the Company in the Northern District of Alabama, alleging violations of the Securities Exchange Act of 1934 and alleging that the Company made false and misleading statements regarding its Specialty Property and Casualty segment. The Company believes the lawsuit is without merit and intends to defend it vigorously; however, there can be no assurance regarding the ultimate outcome of the matter.

If we fail to maintain proper and effective internal controls over financial reporting, our operating results and our ability to operate our business could be harmed.
We continually enhance our operating procedures and internal controls to effectively support our operations and comply with our regulatory and financial reporting requirements. As a result of the inherent limitations in all control systems, no system of controls can provide absolute assurance that all control objectives have been or will be met, and that instances of fraud, if any, within the Company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty and that breakdowns can occur because of an error or mistake. Additionally, controls can be circumvented by the unauthorized and wrongful individual acts of some persons or by collusion of two or more persons. The design of any system of controls is based in part upon certain assumptions about the likelihood of future events and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. Over time, controls may become inadequate because of changes in conditions or the degree of compliance with policies or procedures may deteriorate. Further, the design of a control system must reflect the fact that resource constraints exist. Accordingly, our control system can provide only reasonable, not absolute, assurance of achieving the desired control objectives.
Our success is dependent upon our ability to effectively design and execute our business strategy.
The Company depends upon the skill and work product of our officers and employees in executing our business strategy. While management and the Board monitor the strategic direction of the Company, strategic changes could be made that are not supportable by our capital base.
Our business could be affected by the loss of one or more of our senior executives or other qualified personnel.
We are heavily dependent upon our senior management, and the loss of services of our senior executives could adversely affect our business. Our success has been, and will continue to be, dependent on our ability to retain the services of existing key employees and to attract and retain additional qualified personnel in the future. The loss of the services of key employees or senior managers, or the inability to identify, hire and retain other highly qualified personnel in the future, could adversely affect the quality and profitability of our business operations. Our Board regularly reviews succession planning relating to our Chief Executive Officer as well as other senior officers.

33

Table of Contents
ITEM 1B.UNRESOLVED STAFF COMMENTS.
None.
ITEM 2.PROPERTIES.
We own three office properties, one of which is unencumbered. Our properties in Birmingham, AL and Franklin, TN are each encumbered by a ten-year mortgage loan entered into during 2017 for the purpose of recapitalization of these properties:
 Square Footage of Properties
Property LocationOccupied by
ProAssurance
Leased or Available
for Lease
Total
Birmingham, AL*120,000 45,000 165,000 
Franklin, TN52,000 51,000 103,000 
Okemos, MI53,000 — 53,000 
* Corporate Headquarters
ITEM 3.LEGAL PROCEEDINGS.
Our insurance subsidiaries are involved in various legal actions, a substantial number of which arise from claims made under insurance policies. While the outcome of all legal actions is not presently determinable, management and its legal counsel are of the opinion that these actions will not have a material adverse effect on our financial position or results of operations. See Note 9 of the Notes to Consolidated Financial Statements included herein.

34

Table of Contents
INFORMATION ABOUT OUR EXECUTIVE OFFICERS
The executive officers of ProAssurance Corporation serve at the pleasure of the Board. We have a knowledgeable and experienced management team with established track records in building and managing successful insurance operations. Following is a brief description of each executive officer of ProAssurance, including their principal occupation, and relevant background with ProAssurance and former employers.
Edward L. Rand, Jr. Mr. Rand was appointed as our Chief Executive Officer in 2019 and has served as President since 2018. Mr. Rand previously served as Chief Operating Officer, Chief Financial Officer, Executive Vice President and Senior Vice President since joining ProAssurance in 2004. Mr. Rand also has previously served as President of our Medmarc subsidiary from 2016 to 2018. Prior to joining ProAssurance, Mr. Rand was Chief Accounting Officer and Head of Corporate Finance for PartnerRe Ltd. Prior to that time, Mr. Rand served as the Chief Financial Officer of Atlantic American Corporation. (Age 54)
Michael L. BoguskiMr. Boguski was promoted to President of our Specialty P&C segment in 2019. Mr. Boguski previously served as President of our Eastern subsidiary since ProAssurance acquired Eastern in 2014. Prior to the acquisition of Eastern, Mr. Boguski served as President and Chief Executive Officer of Eastern since 2011 and had been with the Eastern organization since its inception in 1997. Mr. Boguski has almost 35 years of insurance industry experience. (Age 58)
Noreen L. Dishart
Noreen L. Dishart was appointed as an Executive Vice President in 2020 and has served as our Chief Human Resources Officer since 2015. Ms. Dishart has previously served as Vice President of Human Resources of our Eastern subsidiary for 9 years. Ms. Dishart has over 35 years of experience in Human Resources including positions with Johnson & Johnson/Merck. Ms. Dishart received her Bachelor of Science degree from Lock Haven University. (Age 57)
Dana S. HendricksMs. Hendricks was appointed as an Executive Vice President in 2018 and is also our Chief Financial Officer and Corporate Treasurer. Ms. Hendricks has previously served as Senior Vice President of Business Operations for our PICA subsidiary. Prior to that time, Ms. Hendricks served PICA as Vice President of Finance and Corporate Controller. Prior to joining PICA in 2001, Ms. Hendricks held various finance and data analysis positions with American General Life & Accident Insurance Company. Ms. Hendricks is a Certified Public Accountant. (Age 53)
Jeffrey P. Lisenby
 
Mr. Lisenby was appointed as an Executive Vice President in 2014 and is also our General Counsel, Corporate Secretary and head of the corporate Legal Department. Mr. Lisenby has previously served as Senior Vice President. Prior to joining ProAssurance, Mr. Lisenby practiced law privately in Birmingham, Alabama. Mr. Lisenby is a member of the Alabama State Bar and the United States Supreme Court Bar and is a Chartered Property Casualty Underwriter. (Age 52)
Kevin M. ShookMr. Shook is President of our Eastern subsidiary. Mr. Shook previously served as Executive Vice President of our Eastern subsidiary and has been with Eastern for 17 years. Mr. Shook has over 27 years of insurance industry experience, including 10 years with PricewaterhouseCoopers where he primarily served companies within the insurance industry. Mr. Shook is a Certified Public Accountant. (Age 51)
We have adopted a Code of Ethics and Conduct that applies to our directors and executive officers, including but not limited to our principal executive officers and principal financial officer. We also have share ownership guidelines in place to ensure that management maintains a significant portion of their personal investments in the stock of ProAssurance. Both our Code of Ethics and Conduct and our Share Ownership Guidelines are available on the Governance section of our website. Printed copies of these documents may be obtained from our Investor Relations department either by mail at P.O. Box 590009, Birmingham, Alabama 35259-0009, or by telephone at (205) 877-4400 or (800) 282-6242.
ITEM 4. MINE SAFETY DISCLOSURES.
Not applicable.

35

Table of Contents
PART II
ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES.
At February 19, 2021, ProAssurance Corporation had 3,275 stockholders of record and 53,893,267 shares of common stock outstanding. ProAssurance’s common stock currently trades on the NYSE under the symbol “PRA.”
  
20202019
QuarterHighLowHighLow
First$37.58 $20.27 $45.36 $34.61 
Second$23.31 $13.10 $39.92 $34.71 
Third$16.22 $13.49 $40.67 $36.26 
Fourth$18.76 $13.62 $41.40 $35.93 
Dividends DeclaredDividends Paid
Quarter2020201920202019
First*$0.31 $0.31 $0.31 $0.81 
Second
$0.05 $0.31 $0.31 $0.31 
Third
$0.05 $0.31 $0.05 $0.31 
Fourth$0.05 $0.31 $0.05 $0.31 
* Dividends paid in 2019 included a special dividend of $0.50 per common share declared in the fourth quarter of 2018.
The Board declared a quarterly dividend in each quarter of 2020 and 2019. Each dividend was paid in the month following the quarter in which it was declared. Any decision to pay regular or special cash dividends in the future is subject to the Board’s final determination after a comprehensive review of financial performance, future expectations and other factors deemed relevant by the Board.
ProAssurance’s insurance subsidiaries are subject to restrictions on the payment of dividends to the parent. Information regarding restrictions on the ability of the insurance subsidiaries to pay dividends is incorporated herein by reference from the paragraphs under the heading “Insurance Regulatory Matters–Regulation of Dividends and Other Payments from Our Operating Subsidiaries” in Item 1 of this Form 10-K.
Securities Authorized for Issuance Under Equity Compensation Plans
The following table provides information regarding ProAssurance’s equity compensation plans as of December 31, 2020.
Plan CategoryNumber of securities to be
issued upon exercise of
outstanding options, warrants
and rights
Weighted-average
exercise price of
outstanding options,
warrants and rights
 Number of securities
remaining available
for future issuance
under equity compensation
plans (excluding securities reflected
in column (a))
 
(a)(b) (c)
Equity compensation plans approved by security holders521,762$—*1,576,581
Equity compensation plans not approved by security holders
* No outstanding options as of December 31, 2020. Other outstanding share units have no exercise price.


36

Table of Contents
Issuer Purchases of Equity Securities
PeriodTotal Number of
Shares Purchased
Average
Price Paid
per Share
Total Number of Shares Purchased as Part of Publicly Announced Plans or ProgramsApproximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs* (In thousands)
October 1 - 31, 2020N/A$109,643
November 1 - 30, 2020N/A$109,643
December 1 - 31, 2020N/A$109,643
Total$—
* Under its current plan begun in November 2010, the Board has authorized $600 million for the repurchase of common shares or the retirement of outstanding debt. This is ProAssurance's only plan for the repurchase of common shares, and the plan has no expiration date.

37

Table of Contents
ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.
The following discussion generally focuses on the change in financial condition, results of operation and cash flows for the year ended December 31, 2020 as compared to the year ended December 31, 2019 and be should be read in conjunction with the Consolidated Financial Statements and Notes to those statements which accompany this report. For a full discussion of the changes in the financial condition, results of operations and cash flows for the year ended December 31, 2019 as compared to the year ended December 31, 2018, please refer to Item 7, "Management's Discussion and Analysis of Financial Condition and Results of Operations" section of ProAssurance's December 31, 2019 report on Form 10-K.
Throughout the discussion we use certain terms and abbreviations, which can be found in the Glossary of Terms and Acronyms at the beginning of this report. In addition, a glossary of insurance terms and phrases is available on the investor section of our website. Throughout the discussion, references to "ProAssurance," "PRA," "Company," "we," "us" and "our" refer to ProAssurance Corporation and its consolidated subsidiaries. The discussion contains certain forward-looking information that involves significant risks, assumptions and uncertainties. As discussed under the heading "Caution Regarding Forward-Looking Statements," our actual financial condition and results of operations could differ significantly from these forward-looking statements.
ProAssurance Overview
ProAssurance Corporation is a holding company for property and casualty insurance companies. Our wholly owned insurance subsidiaries provide professional liability insurance, liability insurance for medical technology and life sciences risks and workers' compensation insurance. We also provide capital to Syndicate 1729 and Syndicate 6131 at Lloyd's of London.
We operate in five segments which are based on our internal management reporting structure for which financial results are regularly evaluated by our CODM to determine resource allocation and assess operating performance. Descriptions of ProAssurance's five operating and reportable segments are as follows:
Specialty P&C - This segment includes our professional liability business and medical technology liability business. Our professional liability insurance is primarily comprised of medical professional liability products offered to healthcare providers and institutions. We also offer, to a lesser extent, professional liability insurance to attorneys and their firms. Medical technology liability insurance is offered to medical technology and life sciences companies that manufacture or distribute products including entities conducting human clinical trials. We also offer custom alternative risk solutions including loss portfolio transfers, assumed reinsurance and captive cell programs for healthcare professional liability insureds. For our alternative market captive cell programs, we cede either all or a portion of the premium to certain SPCs in our Segregated Portfolio Cell Reinsurance segment.
Workers' Compensation Insurance - This segment includes our workers' compensation insurance business which is provided primarily to employers with 1,000 or fewer employees. Our workers' compensation products include guaranteed cost policies, policyholder dividend policies, retrospectively-rated policies, deductible policies and alternative market solutions. Alternative market program premiums are 100% ceded to either SPCs in our Segregated Portfolio Cell Reinsurance segment or, to a limited extent, an unaffiliated captive insurer.