<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><Version>2.2.0.25</Version><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><ReportLongName>006040 - Disclosure - Accrued Liabilities</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>1/1/2010 - 12/31/2010
USD ($) / shares

USD ($)
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MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"&gt;NOTE&amp;#160;4 - ACCRUED LIABILITIES&lt;/font&gt;&lt;/div&gt;&lt;div style="DISPLAY: block; TEXT-INDENT: 0pt"&gt;&lt;br /&gt;&lt;/div&gt;&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"&gt;Accrued liabilities consisted of the following (in thousands):&lt;/font&gt;&lt;/div&gt;&lt;div style="DISPLAY: block; TEXT-INDENT: 0pt"&gt;&lt;br /&gt;&lt;/div&gt;&lt;div align="left"&gt;&lt;table style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman" cellspacing="0" cellpadding="0" width="100%"&gt;&lt;tr&gt;&lt;td style="PADDING-BOTTOM: 2px" valign="bottom"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160; &lt;/font&gt;&lt;/td&gt;&lt;td style="PADDING-BOTTOM: 2px" valign="bottom"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="BORDER-BOTTOM: black 2px solid" valign="bottom" colspan="6"&gt;&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;December 31,&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="PADDING-BOTTOM: 2px; TEXT-ALIGN: left" valign="bottom" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="PADDING-BOTTOM: 2px" valign="bottom"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160; &lt;/font&gt;&lt;/td&gt;&lt;td style="PADDING-BOTTOM: 2px" valign="bottom"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="BORDER-BOTTOM: black 2px solid" valign="bottom" colspan="2"&gt;&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;2010&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="PADDING-BOTTOM: 2px; TEXT-ALIGN: left" valign="bottom" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="PADDING-BOTTOM: 2px" valign="bottom"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="BORDER-BOTTOM: black 2px solid" valign="bottom" colspan="2"&gt;&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;2009&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="PADDING-BOTTOM: 2px; TEXT-ALIGN: left" valign="bottom" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="bottom"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160; &lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" colspan="2"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: left" valign="bottom" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" colspan="2"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: left" valign="bottom" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="bottom" align="left" width="76%"&gt;&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;Compensation and related employee costs&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td valign="bottom" align="right" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;100,881&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: left" valign="bottom" nowrap="nowrap" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" align="right" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;110,526&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: left" valign="bottom" nowrap="nowrap" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="white"&gt;&lt;td valign="bottom" align="left" width="76%"&gt;&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;Income taxes&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td valign="bottom" align="right" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;10,847&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: left" valign="bottom" nowrap="nowrap" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" align="right" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;40,990&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: left" valign="bottom" nowrap="nowrap" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="bottom" align="left" width="76%"&gt;&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;Interest&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td valign="bottom" align="right" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;25,962&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: left" valign="bottom" nowrap="nowrap" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" align="right" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;20,100&lt;/font&gt;&lt;/td&gt;&lt;td style="TEXT-ALIGN: left" valign="bottom" nowrap="nowrap" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="white"&gt;&lt;td style="PADDING-BOTTOM: 2px" valign="bottom" align="left" width="76%"&gt;&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;Taxes and other&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="PADDING-BOTTOM: 2px" valign="bottom" align="right" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left" valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right" valign="bottom" width="9%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;61,148&lt;/font&gt;&lt;/td&gt;&lt;td style="PADDING-BOTTOM: 2px; TEXT-ALIGN: left" valign="bottom" nowrap="nowrap" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="PADDING-BOTTOM: 2px" valign="bottom" align="right" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left" valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right" valign="bottom" width="9%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;42,548&lt;/font&gt;&lt;/td&gt;&lt;td style="PADDING-BOTTOM: 2px; TEXT-ALIGN: left" valign="bottom" nowrap="nowrap" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td style="PADDING-BOTTOM: 4px" valign="bottom" align="left" width="76%"&gt;&lt;div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;Total accrued liabilities&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="PADDING-BOTTOM: 4px" valign="bottom" align="right" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left" valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right" valign="bottom" width="9%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;198,838&lt;/font&gt;&lt;/td&gt;&lt;td style="PADDING-BOTTOM: 4px; TEXT-ALIGN: left" valign="bottom" nowrap="nowrap" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="PADDING-BOTTOM: 4px" valign="bottom" align="right" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left" valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right" valign="bottom" width="9%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;214,164&lt;/font&gt;&lt;/td&gt;&lt;td style="PADDING-BOTTOM: 4px; TEXT-ALIGN: left" valign="bottom" nowrap="nowrap" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt;</NonNumbericText><NonNumericTextHeader>NOTE&amp;#160;4 - ACCRUED LIABILITIESAccrued liabilities consisted of the following (in thousands):&amp;#160; &amp;#160;December 31,&amp;#160;&amp;#160;</NonNumericTextHeader><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Other</Unit><ElementDataType>us-types:textBlockItemType</ElementDataType><SimpleDataType>string</SimpleDataType><ElementDefenition>Description and amounts of accounts payable and accrued disclosure at the end of the reporting period. This element may be used for the entire disclosure as a single block of text.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 19
 -Subparagraph a
 -Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 20, 24
 -Article 5

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