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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Accounts receivable, less allowances $ 2,383us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 2,370us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common stock, par value $ 2us-gaap_CommonStockParOrStatedValuePerShare $ 2us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 15,000,000us-gaap_CommonStockSharesAuthorized 15,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 5,393,371us-gaap_CommonStockSharesIssued 5,397,138us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 5,393,371us-gaap_CommonStockSharesOutstanding 5,397,138us-gaap_CommonStockSharesOutstanding
Treasury shares, at par 824,011us-gaap_TreasuryStockShares 819,424us-gaap_TreasuryStockShares
Common stock, shares issued to rabbi trust 289,942plpc_CommonStockSharesHeldInEmployeeTrustShare 292,609plpc_CommonStockSharesHeldInEmployeeTrustShare