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Statements of Consolidated Income (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statements of Consolidated Income [Abstract]      
Net sales $ 439,192 $ 424,404 $ 338,305
Cost of products sold 294,754 283,555 230,089
GROSS PROFIT 144,438 140,849 108,216
Costs and expenses      
Selling 37,093 35,825 29,520
General and administrative 46,222 44,396 39,865
Research and engineering 15,447 13,360 12,040
Other operating (income) expenses - net 1,554 1,914 (1,689)
Total costs and expenses 100,316 95,495 79,736
OPERATING INCOME 44,122 45,354 28,480
Other income (expense)      
Interest income 648 575 374
Interest expense (597) (827) (649)
Other income 654 892 1,978
Total other income (expense) 705 640 1,703
INCOME BEFORE INCOME TAXES 44,827 45,994 30,183
Income taxes 15,541 15,010 7,175
NET INCOME 29,286 30,984 23,008
Net loss attributable to noncontrolling interest, net of tax 0 0 (105)
NET INCOME ATTRIBUTABLE TO PLPC $ 29,286 $ 30,984 $ 23,113
BASIC EARNINGS PER SHARE      
Net income attributable to PLPC common shareholders $ 5.50 $ 5.89 $ 4.41
DILUTED EARNINGS PER SHARE      
Net income attributable to PLPC common shareholders $ 5.45 $ 5.78 $ 4.33
Cash dividends declared per share $ 1.00 $ 0.80 $ 0.80
Weighted-average number of shares outstanding - basic 5,324 5,259 5,242
Weighted-average number of shares outstanding - diluted 5,371 5,358 5,335