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Statements of Consolidated Comprehensive Income (Loss) (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Statements of Consolidated Comprehensive Income [Abstract]        
Net income $ 6,596 $ 8,530 $ 14,729 $ 15,384
Other comprehensive income (loss), net of tax        
Currency translation adjustment (7,159) 3,127 (1,886) 5,638
Recognized net acturial loss (net of tax provision $75 and $3 for the three months ended June 30, 2012 and 2011, and net of tax provision $142 and $78 for the six months ended June 30, 2012 and 2011) 124 76 233 128
Other comprehensive income (loss), net of tax (7,035) 3,203 (1,653) 5,766
Comprehensive income (loss) (439) 11,733 13,076 21,150
Less: comprehensive income attributable to noncontrolling interest 0 (37) 0 (50)
Comprehensive income (loss) attributable to PLPC $ (439) $ 11,696 $ 13,076 $ 21,100