﻿<?xml version="1.0" encoding="utf-8"?>
<InstanceReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Version>2.2.0.7</Version>
  <hasSegments>false</hasSegments>
  <ReportName>Property, Plant and Equipment</ReportName>
  <ReportLongName>1040 - Disclosure - Property, Plant and Equipment</ReportLongName>
  <DisplayLabelColumn>true</DisplayLabelColumn>
  <ShowElementNames>false</ShowElementNames>
  <RoundingOption />
  <HasEmbeddedReports>false</HasEmbeddedReports>
  <Columns>
    <Column>
      <LabelColumn>false</LabelColumn>
      <Id>1</Id>
      <Labels>
        <Label Id="1" Label="9 Months Ended" />
        <Label Id="2" Label="Sep. 30, 2010" />
      </Labels>
      <CurrencyCode>USD</CurrencyCode>
      <FootnoteIndexer />
      <hasSegments>false</hasSegments>
      <hasScenarios>false</hasScenarios>
      <Segments />
      <Scenarios />
      <Units>
        <Unit>
          <UnitID>USD</UnitID>
          <UnitType>Standard</UnitType>
          <StandardMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema>
            <MeasureValue>USD</MeasureValue>
            <MeasureNamespace>iso4217</MeasureNamespace>
          </StandardMeasure>
          <Scale>0</Scale>
        </Unit>
        <Unit>
          <UnitID>USDPerShare</UnitID>
          <UnitType>Divide</UnitType>
          <NumeratorMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema>
            <MeasureValue>USD</MeasureValue>
            <MeasureNamespace>iso4217</MeasureNamespace>
          </NumeratorMeasure>
          <DenominatorMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema>
            <MeasureValue>shares</MeasureValue>
            <MeasureNamespace>xbrli</MeasureNamespace>
          </DenominatorMeasure>
          <Scale>0</Scale>
        </Unit>
        <Unit>
          <UnitID>shares</UnitID>
          <UnitType>Standard</UnitType>
          <StandardMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema>
            <MeasureValue>shares</MeasureValue>
            <MeasureNamespace>xbrli</MeasureNamespace>
          </StandardMeasure>
          <Scale>0</Scale>
        </Unit>
      </Units>
      <CurrencySymbol>$</CurrencySymbol>
    </Column>
  </Columns>
  <Rows>
    <Row>
      <Id>2</Id>
      <Label>Property, Plant and Equipment</Label>
      <Level>0</Level>
      <ElementName>hsc_PropertyPlantAndEquipmentDisclosureAbstract</ElementName>
      <ElementPrefix>hsc</ElementPrefix>
      <IsBaseElement>false</IsBaseElement>
      <BalanceType>na</BalanceType>
      <PeriodType>duration</PeriodType>
      <ShortDefinition>No definition available.</ShortDefinition>
      <IsReportTitle>false</IsReportTitle>
      <IsSegmentTitle>false</IsSegmentTitle>
      <IsSubReportEnd>false</IsSubReportEnd>
      <IsCalendarTitle>false</IsCalendarTitle>
      <IsTuple>false</IsTuple>
      <IsAbstractGroupTitle>true</IsAbstractGroupTitle>
      <IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow>
      <IsEquityAdjustmentRow>false</IsEquityAdjustmentRow>
      <IsBeginningBalance>false</IsBeginningBalance>
      <IsEndingBalance>false</IsEndingBalance>
      <IsReverseSign>false</IsReverseSign>
      <PreferredLabelRole />
      <IsEPS>false</IsEPS>
      <FootnoteIndexer />
      <Cells>
        <Cell>
          <Id>1</Id>
          <ShowCurrencySymbol>false</ShowCurrencySymbol>
          <IsNumeric>false</IsNumeric>
          <IsRatio>false</IsRatio>
          <DisplayZeroAsNone>false</DisplayZeroAsNone>
          <NumericAmount>0</NumericAmount>
          <RoundedNumericAmount>0</RoundedNumericAmount>
          <NonNumbericText />
          <NonNumericTextHeader />
          <FootnoteIndexer />
          <hasSegments>false</hasSegments>
          <hasScenarios>false</hasScenarios>
          <DisplayDateInUSFormat>false</DisplayDateInUSFormat>
        </Cell>
      </Cells>
      <OriginalInstanceReportColumns />
      <ElementDataType>xbrli:stringItemType</ElementDataType>
      <SimpleDataType>string</SimpleDataType>
      <ElementDefenition>No definition available.</ElementDefenition>
      <IsTotalLabel>false</IsTotalLabel>
    </Row>
    <Row>
      <Id>3</Id>
      <Label>Property, Plant and Equipment</Label>
      <Level>1</Level>
      <ElementName>us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock</ElementName>
      <ElementPrefix>us-gaap</ElementPrefix>
      <IsBaseElement>true</IsBaseElement>
      <BalanceType>na</BalanceType>
      <PeriodType>duration</PeriodType>
      <ShortDefinition>No definition available.</ShortDefinition>
      <IsReportTitle>false</IsReportTitle>
      <IsSegmentTitle>false</IsSegmentTitle>
      <IsSubReportEnd>false</IsSubReportEnd>
      <IsCalendarTitle>false</IsCalendarTitle>
      <IsTuple>false</IsTuple>
      <IsAbstractGroupTitle>false</IsAbstractGroupTitle>
      <IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow>
      <IsEquityAdjustmentRow>false</IsEquityAdjustmentRow>
      <IsBeginningBalance>false</IsBeginningBalance>
      <IsEndingBalance>false</IsEndingBalance>
      <IsReverseSign>false</IsReverseSign>
      <PreferredLabelRole>terselabel</PreferredLabelRole>
      <IsEPS>false</IsEPS>
      <FootnoteIndexer />
      <Cells>
        <Cell>
          <Id>1</Id>
          <ShowCurrencySymbol>false</ShowCurrencySymbol>
          <IsNumeric>false</IsNumeric>
          <IsRatio>false</IsRatio>
          <DisplayZeroAsNone>false</DisplayZeroAsNone>
          <NumericAmount>0</NumericAmount>
          <RoundedNumericAmount>0</RoundedNumericAmount>
          <NonNumbericText>&lt;table style="font-size:10pt; font-family:'Times New Roman',times,serif;"&gt;
&lt;tr&gt;
&lt;td&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;D.&amp;nbsp;&amp;nbsp;&amp;nbsp; Property, Plant and Equipment&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/p&gt;
&lt;table style="MARGIN-LEFT: 0.25in; WIDTH: 90%; BORDER-COLLAPSE: collapse" cellspacing="0" cellpadding="0" width="90%" border="0"&gt;
&lt;tr style="HEIGHT: 0px"&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 66.68%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="66%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman" size="1"&gt;(In&amp;nbsp;thousands)&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 13.34%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="13%" colspan="2"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman" size="1"&gt;September&amp;nbsp;30&lt;br /&gt;
2010&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 13.34%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="13%" colspan="2"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman" size="1"&gt;December&amp;nbsp;31&lt;br /&gt;
2009&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.12%; PADDING-TOP: 0in" valign="bottom" width="1%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px"&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 66.68%; PADDING-TOP: 0in; BORDER-BOTTOM: medium none" valign="bottom" width="66%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;Land and improvements&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.3%; PADDING-TOP: 0in; BORDER-BOTTOM: medium none" valign="bottom" width="1%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;$&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 12.04%; PADDING-TOP: 0in; BORDER-BOTTOM: medium none" valign="bottom" width="12%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;47,269&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.3%; PADDING-TOP: 0in; BORDER-BOTTOM: medium none" valign="bottom" width="1%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;$&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 12.04%; PADDING-TOP: 0in; BORDER-BOTTOM: medium none" valign="bottom" width="12%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;46,198&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.12%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px"&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 66.68%; PADDING-TOP: 0in" valign="bottom" width="66%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;Buildings and improvements&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 13.34%; PADDING-TOP: 0in" valign="bottom" width="13%" colspan="2"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;199,587&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 13.34%; PADDING-TOP: 0in" valign="bottom" width="13%" colspan="2"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;207,280&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.12%; PADDING-TOP: 0in" valign="bottom" width="1%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px"&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 66.68%; PADDING-TOP: 0in" valign="bottom" width="66%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;Machinery and equipment&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 13.34%; PADDING-TOP: 0in" valign="bottom" width="13%" bgcolor="#CCEEFF" colspan="2"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;3,138,000&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 13.34%; PADDING-TOP: 0in" valign="bottom" width="13%" bgcolor="#CCEEFF" colspan="2"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;3,146,358&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.12%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px"&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 66.68%; PADDING-TOP: 0in" valign="bottom" width="66%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;Uncompleted construction&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 13.34%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="13%" colspan="2"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;60,855&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 13.34%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="13%" colspan="2"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;50,252&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 1.12%; PADDING-TOP: 0in" valign="bottom" width="1%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px"&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 66.68%; PADDING-TOP: 0in" valign="bottom" width="66%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;Gross property, plant and equipment&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 13.34%; PADDING-TOP: 0in; BORDER-BOTTOM: medium none" valign="bottom" width="13%" bgcolor="#CCEEFF" colspan="2"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;3,445,711&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 13.34%; PADDING-TOP: 0in; BORDER-BOTTOM: medium none" valign="bottom" width="13%" bgcolor="#CCEEFF" colspan="2"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;3,450,088&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.12%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px"&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 66.68%; PADDING-TOP: 0in" valign="bottom" width="66%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;Less accumulated depreciation&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 13.34%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="13%" colspan="2"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;(2,017,006&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0.375pt; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;)&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 13.34%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid" valign="bottom" width="13%" colspan="2"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;(1,939,287&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; PADDING-BOTTOM: 0.375pt; WIDTH: 1.12%; PADDING-TOP: 0in" valign="bottom" width="1%"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;)&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px"&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 66.68%; PADDING-TOP: 0in" valign="bottom" width="66%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt 10pt; TEXT-INDENT: -10pt"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;Property, plant and equipment, net&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.3%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="1%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;$&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 12.04%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="12%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"&gt;&lt;b&gt;&lt;font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;1,428,705&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 2.76%; PADDING-TOP: 0in" valign="bottom" width="2%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 1.3%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="1%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;$&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; WIDTH: 12.04%; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 2.25pt double" valign="bottom" width="12%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: right" align="right"&gt;&lt;font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"&gt;1,510,801&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="PADDING-RIGHT: 0in; PADDING-LEFT: 0in; BACKGROUND: #cceeff; PADDING-BOTTOM: 0in; WIDTH: 1.12%; PADDING-TOP: 0in" valign="bottom" width="1%" bgcolor="#CCEEFF"&gt;
&lt;p style="MARGIN: 0in 0in 0pt"&gt;&lt;font style="FONT-SIZE: 1pt; FONT-FAMILY: Times New Roman" size="2"&gt;&amp;nbsp;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
</NonNumbericText>
          <NonNumericTextHeader>D.&amp;nbsp;&amp;nbsp;&amp;nbsp; Property, Plant and Equipment
&amp;nbsp;



(In&amp;nbsp;thousands)

&amp;nbsp;

September&amp;nbsp;30
2010

&amp;nbsp;

December&amp;nbsp;31
2009

&amp;nbsp;


Land</NonNumericTextHeader>
          <FootnoteIndexer />
          <hasSegments>false</hasSegments>
          <hasScenarios>false</hasScenarios>
          <DisplayDateInUSFormat>false</DisplayDateInUSFormat>
        </Cell>
      </Cells>
      <OriginalInstanceReportColumns />
      <ElementDataType>us-types:textBlockItemType</ElementDataType>
      <SimpleDataType>textblock</SimpleDataType>
      <ElementDefenition>Disclosure of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, building and production equipment. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures. This element may be used as a single block of text to include the entire PPE disclosure, including data and tables.</ElementDefenition>
      <ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Accounting Principles Board Opinion (APB)
 -Number 12
 -Paragraph 5

</ElementReferences>
      <IsTotalLabel>false</IsTotalLabel>
    </Row>
  </Rows>
  <Footnotes />
  <NumberOfCols>1</NumberOfCols>
  <NumberOfRows>2</NumberOfRows>
  <HasScenarios>false</HasScenarios>
  <MonetaryRoundingLevel>UnKnown</MonetaryRoundingLevel>
  <SharesRoundingLevel>UnKnown</SharesRoundingLevel>
  <PerShareRoundingLevel>UnKnown</PerShareRoundingLevel>
  <HasPureData>false</HasPureData>
  <SharesShouldBeRounded>true</SharesShouldBeRounded>
</InstanceReport>
