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Computation of Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Amount attributable to PLPC shareholders        
Net income attributable to PLPC $ 6,596 $ 8,386 $ 14,729 $ 15,384
Determination of shares        
Weighted-average common shares outstanding 5,332 5,263 5,333 5,268
Dilutive effect-share-based awards 109 130 107 122
Diluted weighted-average common shares outstanding 5,441 5,393 5,440 5,390
Earnings per common share attributable to PLPC shareholders        
Basic $ 1.24 $ 1.59 $ 2.76 $ 2.92
Diluted $ 1.21 $ 1.55 $ 2.71 $ 2.85