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Quarterly Financial Information (Details) (Unaudited) (USD $)
In Thousands, except Per 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
Summary of quarterly results of operations                      
Net sales $ 104,200 $ 114,206 $ 111,940 $ 108,846 $ 106,096 $ 108,690 $ 114,530 $ 95,088      
Gross profit 32,953 38,507 36,966 36,012 34,192 37,560 36,706 32,391 144,438 140,849 108,216
Income before income taxes 9,313 13,410 9,913 12,191 12,467 10,228 13,050 10,249 44,827 45,994 30,183
Net income 5,273 9,284 6,596 8,133 8,940 6,660 8,530 6,854 29,286 30,984 23,008
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
Net income attributable to PLPC common shareholders $ 0.99 $ 1.75 $ 1.24 $ 1.52 $ 1.70 $ 1.27 $ 1.59 $ 1.33 $ 5.50 $ 5.89 $ 4.41
Net income attributable to PLPC common shareholders $ 0.98 $ 1.71 $ 1.21 $ 1.50 $ 1.67 $ 1.24 $ 1.55 $ 1.30 $ 5.45 $ 5.78 $ 4.33