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COMPUTATION OF EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2014
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Earnings Per Share | The calculation of basic and diluted earnings per share for the three and six month periods ended June 30, 2014 and 2013 was as follows:
|  | Three month period ended June 30 |  |  | Six month period ended June 30 |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 5,080 |  |  | $ | 6,386 |  |  | $ | 7,818 |  |  | $ | 11,351 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination of shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  | 5,389 |  |  |  | 5,368 |  |  |  | 5,390 |  |  |  | 5,372 |
Dilutive effect - share-based awards |  |  | 4 |  |  |  | 82 |  |  |  | 40 |  |  |  | 78 |
Diluted weighted-average common shares outstanding |  |  | 5,393 |  |  |  | 5,450 |  |  |  | 5,430 |  |  |  | 5,450 |
Earnings per common share attributable to PLPC shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.94 |  |  | $ | 1.19 |  |  | $ | 1.45 |  |  | $ | 2.11 |
Diluted |  | $ | 0.94 |  |  | $ | 1.17 |  |  | $ | 1.44 |  |  | $ | 2.08 |

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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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