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Computation of Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator
Net income	$ 4,965	$ 8,133
Determination of shares
Weighted-average common shares outstanding	5,377	5,334
Dilutive effect-share-based awards	80	104
Diluted weighted-average common shares outstanding	5,457	5,438
Earnings per common share attributable to PLPC shareholders
Basic	$ 0.92	$ 1.52
Diluted	$ 0.91	$ 1.50

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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