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Computation of Earnings Per Share | 12 Months Ended
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Dec. 31, 2011
Computation of Earnings Per Share [Abstract] |
Computation of Earnings Per Share | Note H—Computation of Earnings Per Share Basic earnings per share were computed by dividing net income by the weighted-average number of shares of common stock outstanding for each respective period. Diluted earnings per share were calculated by dividing net income by the weighted-average of all potentially dilutive shares of common stock that were outstanding during the periods presented. The calculation of basic and diluted earnings per share for the years ended December 31 were as follows:
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Amount attributable to PLPC shareholders |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to PLPC |  | $ | 30,984 |  |  | $ | 23,113 |  |  | $ | 23,357 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Determination of shares |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  | 5,259 |  |  |  | 5,242 |  |  |  | 5,232 |
Dilutive effect—share-based awards |  |  | 99 |  |  |  | 93 |  |  |  | 134 |
Diluted weighted-average common shares outstanding |  |  | 5,358 |  |  |  | 5,335 |  |  |  | 5,366 |
Earnings per common share attributable to PLPC shareholders |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 5.89 |  |  | $ | 4.41 |  |  | $ | 4.46 |
Diluted |  | $ | 5.78 |  |  | $ | 4.33 |  |  | $ | 4.35 |
For the years ended December 31, 2011, 2010 and 2009, 4,500, 56,500 and 32,500 stock options were excluded from the calculation of diluted earnings per share due to the average market price being lower than the exercise price plus any unearned compensation on unvested options, and as such they are anti-dilutive. For the years ended December 31, 2011, 2010 and 2009, 0, 4,422 and 44,262 restricted shares were excluded from the calculation of diluted earnings per share due to the average market price being lower than the exercise price plus any unearned compensation on unvested options, and as such they are anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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