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Computation of Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Earnings Per Share | The calculation of basic and diluted earnings per share for the year ended December 31 was as follows:
|  | 2014 |  |  | 2013 |  |  | 2012 |
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 12,861 |  |  | $ | 20,587 |  |  | $ | 29,286 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Determination of shares (in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  | 5,377 |  |  |  | 5,361 |  |  |  | 5,324 |
Dilutive effect - share-based awards |  |  | 5 |  |  |  | 106 |  |  |  | 47 |
Diluted weighted-average common shares outstanding |  |  | 5,382 |  |  |  | 5,467 |  |  |  | 5,371 |
Earnings per common share attributable to PLPC shareholders |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.39 |  |  | $ | 3.84 |  |  | $ | 5.50 |
Diluted |  | $ | 2.39 |  |  | $ | 3.77 |  |  | $ | 5.45 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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