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Statements of Consolidated Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Statements of Consolidated Comprehensive Income [Abstract]
Net income	$ 8,133	$ 6,854
Other comprehensive income, net of tax
Currency translation adjustment	5,273	2,511
Recognized net acturial loss (net of tax provision $67 thousand and $31 thousand for the three months ended March 31, 2012 and 2011)	109	52
Other comprehensive income, net of tax	5,382	2,563
Comprehensive income	13,515	9,417
Less: comprehensive income attributable to noncontrolling interest		(13)
Comprehensive income attributable to PLPC	$ 13,515	$ 9,404

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