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Computation of Earnings Per Share (Tables) | 9 Months Ended
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Sep. 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 nine month periods ended September 30, 2013 and 2012 were as follows:
|  | Three Month Period Ended September 30 |  |  | Nine Month Period Ended September 30 |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Net income |  | $ | 6,104 |  |  | $ | 9,284 |  |  | $ | 17,455 |  |  | $ | 24,013 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination of shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  | 5,361 |  |  |  | 5,319 |  |  |  | 5,369 |  |  |  | 5,328 |
Dilutive effect—share-based awards |  |  | 88 |  |  |  | 112 |  |  |  | 81 |  |  |  | 104 |
Diluted weighted-average common shares outstanding |  |  | 5,449 |  |  |  | 5,431 |  |  |  | 5,450 |  |  |  | 5,432 |
Earnings per common share attributable to PLPC shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.14 |  |  | $ | 1.75 |  |  | $ | 3.25 |  |  | $ | 4.51 |
Diluted |  | $ | 1.12 |  |  | $ | 1.71 |  |  | $ | 3.20 |  |  | $ | 4.42 |

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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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