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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities      
Net income $ 1,068,113us-gaap_ProfitLoss $ 673,442us-gaap_ProfitLoss $ 1,134,514us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:      
Amortization of net premium on investments 107,047us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments 151,666us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments 137,313us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Amortization of intangible assets 27,486us-gaap_AmortizationOfIntangibleAssets 27,180us-gaap_AmortizationOfIntangibleAssets 31,799us-gaap_AmortizationOfIntangibleAssets
Net realized and unrealized investment (gains) losses (371,796)us-gaap_GainLossOnInvestments 160,735us-gaap_GainLossOnInvestments (493,409)us-gaap_GainLossOnInvestments
Changes in:      
Reinsurance balances, net (142,268)pre_IncreaseDecreaseInReinsuranceBalancesNet (507,346)pre_IncreaseDecreaseInReinsuranceBalancesNet (102,009)pre_IncreaseDecreaseInReinsuranceBalancesNet
Reinsurance recoverable on paid and unpaid losses, net of ceded premiums payable 46,857pre_IncreaseDecreaseInReinsuranceRecoverableOnPaidAndUnpaidLossesNetOfCededPremiumsPayable 45,422pre_IncreaseDecreaseInReinsuranceRecoverableOnPaidAndUnpaidLossesNetOfCededPremiumsPayable 31,730pre_IncreaseDecreaseInReinsuranceRecoverableOnPaidAndUnpaidLossesNetOfCededPremiumsPayable
Funds held by reinsured companies and funds held – directly managed 188,902pre_IncreaseDecreaseInFundsHeldByReinsuredCompaniesAndFundsHeldDirectlyManaged 99,394pre_IncreaseDecreaseInFundsHeldByReinsuredCompaniesAndFundsHeldDirectlyManaged 381,733pre_IncreaseDecreaseInFundsHeldByReinsuredCompaniesAndFundsHeldDirectlyManaged
Deferred acquisition costs (55,786)us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts (72,956)us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts (13,437)us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts
Net tax assets and liabilities (10,951)pre_IncreaseDecreaseInNetTaxAssetsAndLiabilities (99,067)pre_IncreaseDecreaseInNetTaxAssetsAndLiabilities 80,628pre_IncreaseDecreaseInNetTaxAssetsAndLiabilities
Unpaid losses and loss expenses including life policy benefits (168,490)pre_IncreaseDecreaseInUnpaidLossesAndLossExpensesIncludingLifePolicyBenefits 41,956pre_IncreaseDecreaseInUnpaidLossesAndLossExpensesIncludingLifePolicyBenefits (634,736)pre_IncreaseDecreaseInUnpaidLossesAndLossExpensesIncludingLifePolicyBenefits
Unearned premiums 110,689us-gaap_IncreaseDecreaseInUnearnedPremiums 198,316us-gaap_IncreaseDecreaseInUnearnedPremiums 86,921us-gaap_IncreaseDecreaseInUnearnedPremiums
Other net changes in operating assets and liabilities 52,796us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 108,525us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 52,246us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities 852,599us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 827,267us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 693,293us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Payments/ proceeds from trading securities [Line Items]      
Redemptions of fixed maturities 696,301us-gaap_ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment 1,167,483us-gaap_ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment 1,000,181us-gaap_ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment
Sales and redemptions of short-term investments 92,956us-gaap_ProceedsFromSaleOfShortTermInvestments 312,376us-gaap_ProceedsFromSaleOfShortTermInvestments 110,360us-gaap_ProceedsFromSaleOfShortTermInvestments
Purchases of short-term investments (106,364)us-gaap_PaymentsToAcquireShortTermInvestments (176,339)us-gaap_PaymentsToAcquireShortTermInvestments (215,473)us-gaap_PaymentsToAcquireShortTermInvestments
Consideration paid, related to the acquisition of Presidio, net of cash acquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (9,242)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Other, net (58,840)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (786)us-gaap_PaymentsForProceedsFromOtherInvestingActivities 995us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash (used in) provided by investing activities (250,007)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 417,993us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (219,538)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities      
Dividends paid to common and preferred shareholders (190,960)us-gaap_PaymentsOfDividends (200,078)us-gaap_PaymentsOfDividends (217,615)us-gaap_PaymentsOfDividends
Repurchase of common shares (547,120)us-gaap_PaymentsForRepurchaseOfCommonStock (715,421)us-gaap_PaymentsForRepurchaseOfCommonStock (504,991)us-gaap_PaymentsForRepurchaseOfCommonStock
Issuance of common shares, net of taxes paid 16,785us-gaap_ProceedsFromIssuanceOrSaleOfEquity 51,111us-gaap_ProceedsFromIssuanceOrSaleOfEquity 34,323us-gaap_ProceedsFromIssuanceOrSaleOfEquity
(Distribution) sale of shares to noncontrolling interests (14,265)us-gaap_MinorityInterestPeriodIncreaseDecrease 47,193us-gaap_MinorityInterestPeriodIncreaseDecrease 0us-gaap_MinorityInterestPeriodIncreaseDecrease
Net proceeds from issuance of preferred shares 0pre_NetProceedsFromIssuanceOfPreferredStock 241,265pre_NetProceedsFromIssuanceOfPreferredStock 0pre_NetProceedsFromIssuanceOfPreferredStock
Repurchase of preferred shares 0us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock (290,000)us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock 0us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock
Net cash used in financing activities (735,560)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (865,930)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (688,283)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of foreign exchange rate changes on cash (50,049)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (4,550)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (6,024)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
(Decrease) increase in cash and cash equivalents (183,017)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 374,780us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (220,552)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents—beginning of year 1,496,485us-gaap_CashAndCashEquivalentsAtCarryingValue 1,121,705us-gaap_CashAndCashEquivalentsAtCarryingValue 1,342,257us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents—end of year 1,313,468us-gaap_CashAndCashEquivalentsAtCarryingValue 1,496,485us-gaap_CashAndCashEquivalentsAtCarryingValue 1,121,705us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental cash flow information:      
Taxes paid 284,798us-gaap_IncomeTaxesPaid 174,031us-gaap_IncomeTaxesPaid 186,970us-gaap_IncomeTaxesPaid
Interest paid 49,259us-gaap_InterestPaid 49,259us-gaap_InterestPaid 49,259us-gaap_InterestPaid
Fixed maturities      
Payments/ proceeds from trading securities [Line Items]      
Sales of fixed maturities and sales of equities 8,730,831us-gaap_ProceedsFromSaleOfTradingSecuritiesHeldforinvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
7,887,186us-gaap_ProceedsFromSaleOfTradingSecuritiesHeldforinvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
6,969,074us-gaap_ProceedsFromSaleOfTradingSecuritiesHeldforinvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
Purchases of fixed maturities and purchases of equities (9,844,660)us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
(8,872,874)us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
(8,067,087)us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
Equities      
Payments/ proceeds from trading securities [Line Items]      
Sales of fixed maturities and sales of equities 691,970us-gaap_ProceedsFromSaleOfTradingSecuritiesHeldforinvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
796,403us-gaap_ProceedsFromSaleOfTradingSecuritiesHeldforinvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
821,977us-gaap_ProceedsFromSaleOfTradingSecuritiesHeldforinvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Purchases of fixed maturities and purchases of equities $ (452,201)us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
$ (695,456)us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
$ (830,323)us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember