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Computation of Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Computation of Earnings Per Share [Abstract] |
Calculation of basic and diluted earnings per share | The calculation of basic and diluted earnings per share for the years ended December 31 was as follows:
|  | 2012 |  |  | 2011 |  |  | 2010 |
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to PLPC |  | $ | 29,286 |  |  | $ | 30,984 |  |  | $ | 23,113 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Determination of shares |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  | 5,324 |  |  |  | 5,259 |  |  |  | 5,242 |
Dilutive effect—share-based awards |  |  | 47 |  |  |  | 99 |  |  |  | 93 |
Diluted weighted-average common shares outstanding |  |  | 5,371 |  |  |  | 5,358 |  |  |  | 5,335 |
Earnings per common share attributable to PLPC shareholders |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 5.50 |  |  | $ | 5.89 |  |  | $ | 4.41 |
Diluted |  | $ | 5.45 |  |  | $ | 5.78 |  |  | $ | 4.33 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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