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Computation of Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Amount attributable to PLPC shareholders
Net income attributable to PLPC	$ 9,284	$ 6,660	$ 24,013	$ 22,044
Determination of shares
Weighted-average common shares outstanding	5,319	5,253	5,328	5,263
Dilutive effect-share-based awards	112	128	104	123
Diluted weighted-average common shares outstanding	5,431	5,381	5,432	5,386
Earnings per common share attributable to PLPC shareholders
Basic	$ 1.75	$ 1.27	$ 4.51	$ 4.19
Diluted	$ 1.71	$ 1.24	$ 4.42	$ 4.09

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