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Computation of Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator                      
Net income attributable to PLPC $ 5,273 $ 9,284 $ 6,596 $ 8,133 $ 8,940 $ 6,660 $ 8,386 $ 6,998 $ 29,286 $ 30,984 $ 23,113
Determination of shares                      
Weighted-average common shares outstanding                 5,324 5,259 5,242
Dilutive effect-share-based awards                 47 99 93
Diluted weighted-average common shares outstanding                 5,371 5,358 5,335
Earnings per common share attributable to PLPC shareholders                      
Basic $ 0.99 $ 1.75 $ 1.24 $ 1.52 $ 1.70 $ 1.27 $ 1.59 $ 1.33 $ 5.50 $ 5.89 $ 4.41
Diluted $ 0.98 $ 1.71 $ 1.21 $ 1.50 $ 1.67 $ 1.24 $ 1.55 $ 1.30 $ 5.45 $ 5.78 $ 4.33