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Computation of Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
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, 2013 and 2012 were as follows:
|  | Three Month Period Ended June 30 |  |  | Six Month Period Ended June 30 |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Net income |  | $ | 6,386 |  |  | $ | 6,596 |  |  | $ | 11,351 |  |  | $ | 14,729 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination of shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  | 5,368 |  |  |  | 5,332 |  |  |  | 5,372 |  |  |  | 5,333 |
Dilutive effect—share-based awards |  |  | 82 |  |  |  | 109 |  |  |  | 78 |  |  |  | 107 |
Diluted weighted-average common shares outstanding |  |  | 5,450 |  |  |  | 5,441 |  |  |  | 5,450 |  |  |  | 5,440 |
Earnings per common share attributable to PLPC shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.19 |  |  | $ | 1.24 |  |  | $ | 2.11 |  |  | $ | 2.76 |
Diluted |  | $ | 1.17 |  |  | $ | 1.21 |  |  | $ | 2.08 |  |  | $ | 2.71 |

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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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