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Statements of Consolidated Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Statements of Consolidated Income [Abstract]      
Net sales $ 424,404 $ 338,305 $ 257,206
Cost of products sold 283,555 230,089 172,438
GROSS PROFIT 140,849 108,216 84,768
Costs and expenses      
Selling 35,825 29,520 22,702
General and administrative 44,396 39,865 33,993
Research and engineering 13,360 12,040 9,216
Other operating (income) expenses-net 1,914 (1,689) (603)
Total costs and expenses 95,495 79,736 65,308
OPERATING INCOME 45,354 28,480 19,460
Other income (expense)      
Gain on acquisition of business     9,087
Interest income 575 374 380
Interest expense (827) (649) (523)
Other income 892 1,978 1,189
Total other income (expense) 640 1,703 10,133
INCOME BEFORE INCOME TAXES 45,994 30,183 29,593
Income taxes 15,010 7,175 6,760
NET INCOME 30,984 23,008 22,833
Net loss attributable to noncontrolling interest, net of tax   (105) (524)
NET INCOME ATTRIBUTABLE TO PLPC $ 30,984 $ 23,113 $ 23,357
BASIC EARNINGS PER SHARE      
Net income attributable to PLPC common shareholders $ 5.89 $ 4.41 $ 4.46
DILUTED EARNINGS PER SHARE      
Net income attributable to PLPC common shareholders $ 5.78 $ 4.33 $ 4.35
Cash dividends declared per share $ 0.80 $ 0.80 $ 0.80
Weighted-average number of shares outstanding--basic 5,259 5,242 5,232
Weighted-average number of shares outstanding--diluted 5,358 5,335 5,366