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Statements of Consolidated Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]      
Net sales $ 388,185us-gaap_SalesRevenueGoodsNet $ 409,776us-gaap_SalesRevenueGoodsNet $ 439,192us-gaap_SalesRevenueGoodsNet
Cost of products sold 267,237us-gaap_CostOfGoodsSold 278,875us-gaap_CostOfGoodsSold 294,754us-gaap_CostOfGoodsSold
GROSS PROFIT 120,948us-gaap_GrossProfit 130,901us-gaap_GrossProfit 144,438us-gaap_GrossProfit
Costs and expenses      
Selling 35,655us-gaap_SellingAndMarketingExpense 35,704us-gaap_SellingAndMarketingExpense 37,093us-gaap_SellingAndMarketingExpense
General and administrative 42,563us-gaap_GeneralAndAdministrativeExpense 44,557us-gaap_GeneralAndAdministrativeExpense 46,222us-gaap_GeneralAndAdministrativeExpense
Research and engineering 16,302plpc_ResearchAndEngineeringExpense 14,708plpc_ResearchAndEngineeringExpense 15,447plpc_ResearchAndEngineeringExpense
Other operating expenses - net 5,190us-gaap_OtherOperatingIncomeExpenseNet 3,922us-gaap_OtherOperatingIncomeExpenseNet 1,554us-gaap_OtherOperatingIncomeExpenseNet
Goodwill impairment 0us-gaap_GoodwillImpairmentLoss 862us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss
Total costs and expenses 99,710us-gaap_CostsAndExpenses 99,753us-gaap_CostsAndExpenses 100,316us-gaap_CostsAndExpenses
OPERATING INCOME 21,238us-gaap_OperatingIncomeLoss 31,148us-gaap_OperatingIncomeLoss 44,122us-gaap_OperatingIncomeLoss
Other income (expense)      
Interest income 483us-gaap_InvestmentIncomeInterest 618us-gaap_InvestmentIncomeInterest 648us-gaap_InvestmentIncomeInterest
Interest expense (658)us-gaap_InterestExpense (450)us-gaap_InterestExpense (597)us-gaap_InterestExpense
Other income 347us-gaap_OtherNonoperatingIncomeExpense 478us-gaap_OtherNonoperatingIncomeExpense 654us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense) 172us-gaap_NonoperatingIncomeExpense 646us-gaap_NonoperatingIncomeExpense 705us-gaap_NonoperatingIncomeExpense
INCOME BEFORE INCOME TAXES 21,410us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 31,794us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 44,827us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income taxes 8,549us-gaap_IncomeTaxExpenseBenefit 11,207us-gaap_IncomeTaxExpenseBenefit 15,541us-gaap_IncomeTaxExpenseBenefit
NET INCOME $ 12,861us-gaap_ProfitLoss $ 20,587us-gaap_ProfitLoss $ 29,286us-gaap_ProfitLoss
BASIC EARNINGS PER SHARE      
Net income $ 2.39us-gaap_EarningsPerShareBasic $ 3.84us-gaap_EarningsPerShareBasic $ 5.50us-gaap_EarningsPerShareBasic
DILUTED EARNINGS PER SHARE      
Net income $ 2.39us-gaap_EarningsPerShareDiluted $ 3.77us-gaap_EarningsPerShareDiluted $ 5.45us-gaap_EarningsPerShareDiluted
Cash dividends declared per share $ 0.80us-gaap_CommonStockDividendsPerShareDeclared $ 0.60us-gaap_CommonStockDividendsPerShareDeclared $ 1.00us-gaap_CommonStockDividendsPerShareDeclared
Weighted-average number of shares outstanding - basic 5,377us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 5,361us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 5,324us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted-average number of shares outstanding - diluted 5,382us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 5,467us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 5,371us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding