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Statements of Consolidated Shareholders' Equity (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Tax provision (benefit) for recognized net actuarial loss | $ 6 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax | $ 187 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax | $ 284 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
Tax provision (benefit) | (3,115)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax | 2,506 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax | (1,627)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax
Curtailment net of tax provision |  |  | 2,376 us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax
Purchase of common shares | 40,145 us-gaap_StockRepurchasedDuringPeriodShares | 89,807 us-gaap_StockRepurchasedDuringPeriodShares | 50,334 us-gaap_StockRepurchasedDuringPeriodShares
Issuance of common shares | 3,531 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 34,575 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 20,365 us-gaap_StockIssuedDuringPeriodSharesNewIssues
Restricted shares awards | 42,678 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures | 68,369 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures | 74,276 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
Common shares issued to rabbi trust | 43,592 plpc_StockIssuedDuringPeriodSharesSharesHeldInEmployeeTrust | 69,120 plpc_StockIssuedDuringPeriodSharesSharesHeldInEmployeeTrust | 74,996 plpc_StockIssuedDuringPeriodSharesSharesHeldInEmployeeTrust
Cash dividends declared per share | $ 0.80 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.60 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.00 us-gaap_CommonStockDividendsPerShareDeclared
Common Shares [Member] |  |  |
Purchase of common shares | 40,145 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 89,807 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 50,334 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of common shares | 3,531 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 34,575 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 20,365 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Restricted shares awards | 42,678 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 68,369 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 74,276 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common Shares Issued to Rabbi Trust [Member] |  |  |
Common shares issued to rabbi trust | 43,592 plpc_StockIssuedDuringPeriodSharesSharesHeldInEmployeeTrust / us-gaap_StatementEquityComponentsAxis = us-gaap_TrustForBenefitOfEmployeesMember | 69,120 plpc_StockIssuedDuringPeriodSharesSharesHeldInEmployeeTrust / us-gaap_StatementEquityComponentsAxis = us-gaap_TrustForBenefitOfEmployeesMember | 74,996 plpc_StockIssuedDuringPeriodSharesSharesHeldInEmployeeTrust / us-gaap_StatementEquityComponentsAxis = us-gaap_TrustForBenefitOfEmployeesMember
Deferred Compensation Liability [Member] |  |  |
Common shares issued to rabbi trust | 43,592 plpc_StockIssuedDuringPeriodSharesSharesHeldInEmployeeTrust / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember | 69,120 plpc_StockIssuedDuringPeriodSharesSharesHeldInEmployeeTrust / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember | 74,996 plpc_StockIssuedDuringPeriodSharesSharesHeldInEmployeeTrust / us-gaap_StatementEquityComponentsAxis = us-gaap_DeferredCompensationExcludingShareBasedPaymentsAndRetirementBenefitsMember
Paid In Capital [Member] |  |  |
Issuance of common shares | 3,531 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 34,575 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 20,365 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
Restricted shares awards | 42,678 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 68,369 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 74,276 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
Retained Earnings [Member] |  |  |
Purchase of common shares | 40,145 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 89,807 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 50,334 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Cash dividends declared per share | $ 0.80 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 0.6 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 1 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Unrecognized Pension Benefit Cost [Member] |  |  |
Tax provision (benefit) for recognized net actuarial loss | 6 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 187 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 284 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Tax provision (benefit) | (3,115)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 2,506 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (1,627)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Curtailment net of tax provision |  |  | $ 2,376 us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember

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