﻿<?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>EMPLOYEE BENEFIT PLANS</ReportName>
  <ReportLongName>11101 - Disclosure - EMPLOYEE BENEFIT PLANS</ReportLongName>
  <DisplayLabelColumn>true</DisplayLabelColumn>
  <ShowElementNames>false</ShowElementNames>
  <RoundingOption />
  <HasEmbeddedReports>false</HasEmbeddedReports>
  <Columns>
    <Column>
      <LabelColumn>false</LabelColumn>
      <Id>1</Id>
      <Labels>
        <Label Id="1" Label="6 Months Ended" />
        <Label Id="2" Label="Jun. 30, 2010" />
      </Labels>
      <CurrencyCode>USD</CurrencyCode>
      <FootnoteIndexer />
      <hasSegments>false</hasSegments>
      <hasScenarios>false</hasScenarios>
      <Segments />
      <Scenarios />
      <Units>
        <Unit>
          <UnitID>Unit1</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>Unit13</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>Unit12</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>5</Id>
      <Label>EMPLOYEE BENEFIT PLANS</Label>
      <Level>3</Level>
      <ElementName>us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock</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;div&gt;
&lt;div style="font-family: 'Times New Roman',Times,serif;"&gt;
&lt;div style="margin-top: 12pt; font-size: 10pt;" align="left"&gt;&lt;b&gt;11. EMPLOYEE BENEFIT PLANS&lt;/b&gt; &lt;/div&gt;
&lt;div style="margin-top: 6pt; font-size: 10pt;" align="left"&gt;&lt;b&gt;&lt;i&gt;a) Employee option plan&lt;/i&gt;&lt;/b&gt; &lt;/div&gt;
&lt;div style="margin-top: 6pt; font-size: 10pt;" align="left"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;In 2001, the Company implemented the Allied World Assurance Company Holdings, Ltd Second Amended and Restated 2001 Employee Stock Option Plan (the "Plan"). Under the Plan, up to 4,000,000 common shares of Holdings may be issued. Holdings has filed a registration statement on Form S-8 under the Securities Act of 1933, as amended, to register common shares issued or reserved for issuance under the Plan. These options are exercisable in certain limited conditions, expire after 10&amp;nbsp;years, and generally vest pro-rata over four years from the date of grant. The exercise price of options issued are determined by the compensation committee of the board of directors but shall not be less than 100% of the fair market value of the common shares of Holdings on the date the option award is granted. &lt;/div&gt;
&lt;div align="center"&gt;
&lt;table style="font-size: 10pt;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt;
&lt;tr valign="bottom"&gt;&lt;td width="76%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="3%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="3%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="3%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="3%"&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="7" nowrap="nowrap" align="center"&gt;&lt;b&gt;Six Months Ended June 30, 2010&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td colspan="3" nowrap="nowrap" align="center"&gt;&lt;b&gt;Weighted Average&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="3" nowrap="nowrap" align="center"&gt;&lt;b&gt;Options&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="3" nowrap="nowrap" align="center"&gt;&lt;b&gt;Exercise Price&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="background: #cceeff;" valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Outstanding at beginning of period&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;1,314,907&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;35.54&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Granted&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;311,610&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;46.05&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="background: #cceeff;" valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Exercised&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td nowrap="nowrap" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;(122,403&lt;/td&gt;
&lt;td nowrap="nowrap"&gt;)&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;29.22&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Forfeited&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td nowrap="nowrap" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;(19,546&lt;/td&gt;
&lt;td nowrap="nowrap"&gt;)&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;42.76&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="background: #cceeff;" valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Expired&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td nowrap="nowrap" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;(5,062&lt;/td&gt;
&lt;td nowrap="nowrap"&gt;)&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;45.72&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 1px;"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;&amp;nbsp;&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Outstanding at end of period&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;1,479,506&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;38.15&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 1px;"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;&amp;nbsp;&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt;
&lt;div style="margin-top: 6pt; font-size: 10pt;" align="left"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;Assumptions used in the option-pricing model for the options granted during the six months ended June&amp;nbsp;30, 2010 are as follows: &lt;/div&gt;
&lt;div align="center"&gt;
&lt;table style="font-size: 10pt;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt;
&lt;tr valign="bottom"&gt;&lt;td width="88%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td colspan="2" nowrap="nowrap" align="center"&gt;&lt;b&gt;Options Granted During&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td colspan="2" nowrap="nowrap" align="center"&gt;&lt;b&gt;the Six Months Ended&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"&gt;&lt;b&gt;June 30, 2010&lt;/b&gt;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;"&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="background: #cceeff;" valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Expected term of option&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;5.47&lt;/td&gt;
&lt;td nowrap="nowrap"&gt;years&lt;/td&gt;&lt;/tr&gt;
&lt;tr valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Weighted average risk-free interest rate&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td nowrap="nowrap" align="left"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;2.65&lt;/td&gt;
&lt;td nowrap="nowrap"&gt;%&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="background: #cceeff;" valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Weighted average expected volatility&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td nowrap="nowrap" align="left"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;42.35&lt;/td&gt;
&lt;td nowrap="nowrap"&gt;%&lt;/td&gt;&lt;/tr&gt;
&lt;tr valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Dividend yield&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td nowrap="nowrap" align="left"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;1.25&lt;/td&gt;
&lt;td nowrap="nowrap"&gt;%&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="background: #cceeff;" valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Weighted average fair value on grant date&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="left"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;17.34&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 1px;"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;&amp;nbsp;&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;"&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt;
&lt;div style="margin-top: 6pt; font-size: 10pt;" align="left"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;The Company has assumed a weighted average annual forfeiture rate of 6.37% in determining the compensation expense over the service period. &lt;/div&gt;
&lt;div style="margin-top: 6pt; font-size: 10pt;" align="left"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;Compensation expense of $758 and $1,550 relating to the options has been included in "general and administrative expenses" in the Company's consolidated income statements for the three and six months ended June&amp;nbsp;30, 2010, respectively. Compensation expense of $682 and $1,307 relating to the options has been included in "general and administrative expenses" in the Company's consolidated income statements for the three and six months ended June&amp;nbsp;30, 2009, respectively. As of June&amp;nbsp;30, 2010 and December&amp;nbsp;31, 2009, the Company has recorded in "additional paid-in capital" on the consolidated balance sheets an amount of $33,942 and $28,699, respectively, in connection with all options granted. &lt;/div&gt;
&lt;div style="margin-top: 12pt; font-size: 10pt;" align="left"&gt;&lt;b&gt;&lt;i&gt;b) Stock incentive plan&lt;/i&gt;&lt;/b&gt; &lt;/div&gt;
&lt;div style="margin-top: 6pt; font-size: 10pt;" align="left"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;In 2004, the Company implemented the Allied World Assurance Company Holdings, Ltd Second Amended and Restated 2004 Stock Incentive Plan (the "Stock Incentive Plan"). The Stock Incentive Plan provides for grants of restricted stock, restricted stock units ("RSUs"), dividend equivalent rights and other equity-based awards. A total of 2,000,000 common shares may be issued under the Stock Incentive Plan. To date, only RSUs have been granted. These RSUs generally vest in the fourth or fifth year from the original grant date, or pro-rata over four years from the date of the grant. &lt;/div&gt;&lt;/div&gt;
&lt;div style="font-family: 'Times New Roman',Times,serif;"&gt;
&lt;div align="center"&gt;
&lt;table style="font-size: 10pt;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt;
&lt;tr valign="bottom"&gt;&lt;td width="76%"&gt; &lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="3%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="3%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="3%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="3%"&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="7" nowrap="nowrap" align="center"&gt;&lt;b&gt;Six Months Ended June 30, 2010&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td colspan="3" nowrap="nowrap" align="center"&gt;&lt;b&gt;Weighted Average&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td colspan="3" nowrap="nowrap" align="center"&gt;&lt;b&gt;Grant Date Fair&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="3" nowrap="nowrap" align="center"&gt;&lt;b&gt;RSUs&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="3" nowrap="nowrap" align="center"&gt;&lt;b&gt;Value&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="background: #cceeff;" valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Outstanding RSUs at beginning of period&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;915,432&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;36.51&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;RSUs granted&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;41,197&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;46.05&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="background: #cceeff;" valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Performance-based RSUs granted&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;279,900&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;46.05&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;RSUs fully vested&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td nowrap="nowrap" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;(143,183&lt;/td&gt;
&lt;td nowrap="nowrap"&gt;)&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;40.97&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="background: #cceeff;" valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;RSUs forfeited&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td nowrap="nowrap" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;(8,802&lt;/td&gt;
&lt;td nowrap="nowrap"&gt;)&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;38.75&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 1px;"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;&amp;nbsp;&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Outstanding RSUs at end of period&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;1,084,544&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;38.72&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 1px;"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;&amp;nbsp;&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt;
&lt;div style="margin-top: 6pt; font-size: 10pt;" align="left"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;During 2010, the Company granted performance-based RSUs in lieu of utilizing the LTIP (as defined in Note 11(c)). The performance-based RSUs are structured in exactly the same form as shares issued under the LTIP in terms of vesting restrictions and achievement of established performance criteria. For the performance-based RSUs granted in 2010, the Company anticipates that the performance goals are likely to be achieved. Based on the performance goals, the performance-based RSUs granted in 2010 are expensed at 100% of the fair market value of Holding's common share on the date of grant. The expense is recognized over the performance period. &lt;/div&gt;
&lt;div style="margin-top: 6pt; font-size: 10pt;" align="left"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;Compensation expense of $3,327 and $7,041 relating to the issuance of the RSUs, including the performance based RSUs, has been recognized in "general and administrative expenses" in the Company's consolidated income statements for the three and six months ended June&amp;nbsp;30, 2010, respectively. Compensation expense of $2,273 and $4,624 relating to the issuance of the RSUs, including the performance-based RSUs, has been recognized in "general and administrative expenses" in the Company's consolidated income statements for the three and six months ended June&amp;nbsp;30, 2009, respectively. The compensation expense for the RSUs is based on the fair market value of Holdings' common shares at the time of grant. The Company has assumed a weighted average annual forfeiture rate of 4.98% in determining the compensation expense over the service period. &lt;/div&gt;
&lt;div style="margin-top: 6pt; font-size: 10pt;" align="left"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;As of June&amp;nbsp;30, 2010 and December&amp;nbsp;31, 2009, the Company has recorded $32,679 and $28,827, respectively, in "additional paid-in capital" on the consolidated balance sheets in connection with the RSUs awarded. &lt;/div&gt;
&lt;div style="margin-top: 12pt; font-size: 10pt;" align="left"&gt;&lt;b&gt;&lt;i&gt;c) Long-term incentive plan&lt;/i&gt;&lt;/b&gt; &lt;/div&gt;
&lt;div style="margin-top: 6pt; font-size: 10pt;" align="left"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;In 2006, the Company implemented the Allied World Assurance Company Holdings, Ltd Second Amended and Restated Long-Term Incentive Plan ("LTIP"). The LTIP provides for performance based equity awards to key employees in order to promote the long-term growth and profitability of the Company. Each award represents the right to receive a number of common shares in the future, based upon the achievement of established performance criteria during the applicable three-year performance period. A total of 2,000,000 common shares may be issued under the LTIP. &lt;/div&gt;
&lt;div align="center"&gt;
&lt;table style="font-size: 10pt;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt;
&lt;tr valign="bottom"&gt;&lt;td width="76%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="3%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="3%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="3%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="3%"&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="7" nowrap="nowrap" align="center"&gt;&lt;b&gt;Six Months Ended June 30, 2010&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td colspan="3" nowrap="nowrap" align="center"&gt;&lt;b&gt;Weighted Average&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td colspan="3" nowrap="nowrap" align="center"&gt;&lt;b&gt;Grant Date Fair&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="3" nowrap="nowrap" align="center"&gt;&lt;b&gt;LTIP&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="3" nowrap="nowrap" align="center"&gt;&lt;b&gt;Value&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="background: #cceeff;" valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Outstanding LTIP awards at beginning of period&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;1,148,411&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;42.28&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Additional LTIP awards granted due to the achievement of 2007 &amp;#8212; 2009 performance criteria&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;181,250&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;43.40&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="background: #cceeff;" valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;LTIP awards vested&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td nowrap="nowrap" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;(543,750&lt;/td&gt;
&lt;td nowrap="nowrap"&gt;)&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;43.40&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 1px;"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;&amp;nbsp;&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Outstanding LTIP awards at end of period&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;785,911&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;41.76&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 1px;"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;&amp;nbsp;&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 3px double;" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt;
&lt;div style="margin-top: 6pt; font-size: 10pt;" align="left"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;Compensation expense of $3,842 and $8,863 relating to the LTIP has been recognized in "general and administrative expenses" in the Company's consolidated income statements for the three and six months ended June&amp;nbsp;30, 2010, respectively. Compensation expense of $4,642 and $9,284 relating to the LTIP has been recognized in "general and administrative expenses" in the Company's consolidated income statements for the three and six months ended June&amp;nbsp;30, 2009, respectively. The compensation expense for the LTIP is based on the fair market value of the Company's common shares at the time of grant. The LTIP is deemed to be an equity plan and as such, $68,626 and $59,777 have been included in "additional paid-in capital" on the consolidated balance sheets as of June&amp;nbsp;30, 2010 and December&amp;nbsp;31, 2009, respectively. &lt;/div&gt;
&lt;div style="margin-top: 6pt; font-size: 10pt;" align="left"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;In calculating the compensation expense and in the determination of share equivalents for the purpose of calculating diluted earnings per share, it is estimated for the LTIP awards granted in 2008 that the maximum performance goals as set by the LTIP are likely to be achieved over the performance period. Based on the performance goals, the LTIP awards granted in 2008 are expensed at 150% of the fair market value of Holdings' common shares on the date of grant. For the LTIP awards granted in 2009, the Company anticipates that the performance goals as set by the LTIP are likely to be achieved above the target but below the maximum over the performance period. Based on the performance goals, the LTIP awards granted in 2009 are expensed at 132.5% of the fair market value of Holdings' common shares on the date of grant. The expense is recognized over the performance period. &lt;/div&gt;&lt;/div&gt;
&lt;div style="font-family: 'Times New Roman',Times,serif;"&gt;
&lt;div style="margin-top: 12pt; font-size: 10pt;" align="left"&gt;&lt;b&gt;&lt;i&gt;d) Cash-equivalent stock awards&lt;/i&gt;&lt;/b&gt; &lt;/div&gt;
&lt;div style="margin-top: 6pt; font-size: 10pt;" align="left"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;As part of the Company's annual year-end compensation awards, the Company granted both stock-based awards and cash-equivalent stock awards. The cash-equivalent awards were granted to employees who received RSU and LTIP awards and were granted in lieu of granting the full award as a stock-based award. The cash-equivalent time vesting RSU awards vest pro-rata over four years from the date of grant. The cash-equivalent LTIP awards and performance based RSU awards vest after a three-year performance period. As the cash-equivalent awards are settled in cash, we establish a liability equal to the product of the fair market value of Holdings' common shares as of the end of the reporting period and the total awards outstanding. The liability is included in "accounts payable and accrued expenses" in the balance sheets and changes in the liability are recorded in "general and administrative expenses" in the consolidated income statements. For the three and six months ended June&amp;nbsp;30, 2010, the expense recognized for the cash-equivalent stock awards was $3,012 and $5,321, respectively. For the three and six months ended June&amp;nbsp;30, 2009, the expense recognized for the cash-equivalent stock awards was $809 and $1,345, respectively. &lt;/div&gt;
&lt;div style="margin-top: 6pt; font-size: 10pt;" align="left"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;The following table shows the stock related compensation expense relating to the stock options, RSUs, LTIP and cash equivalent awards for the three and six months ended June&amp;nbsp;30, 2010 and 2009. &lt;/div&gt;
&lt;div align="center"&gt;
&lt;table style="font-size: 10pt;" border="0" cellspacing="0" cellpadding="0" width="100%"&gt;
&lt;tr valign="bottom"&gt;&lt;td width="52%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="5%"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td width="1%"&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td colspan="6" nowrap="nowrap" align="center"&gt;&lt;b&gt;For the Three Months Ended&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td colspan="6" nowrap="nowrap" align="center"&gt;&lt;b&gt;For the Six Months Ended&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="6" nowrap="nowrap" align="center"&gt;&lt;b&gt;June 30,&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="6" nowrap="nowrap" align="center"&gt;&lt;b&gt;June 30,&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 8pt;" valign="bottom"&gt;&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"&gt;&lt;b&gt;2010&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"&gt;&lt;b&gt;2009&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"&gt;&lt;b&gt;2010&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"&gt;&lt;b&gt;2009&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="background: #cceeff;" valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Stock Options&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="left"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;758&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="left"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;682&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="left"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;1,550&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="left"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;1,307&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;RSUs&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;3,327&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;2,273&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;7,041&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;4,624&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="background: #cceeff;" valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;LTIP&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;3,842&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;4,642&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;8,863&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;9,284&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Cash-equivalent stock awards&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;3,012&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;809&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;5,321&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="right"&gt;1,345&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="font-size: 1px;"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;&amp;nbsp;&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="background: #cceeff;" valign="bottom"&gt;&lt;td&gt;
&lt;div style="text-indent: -15px; margin-left: 15px;"&gt;Total&lt;/div&gt;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="left"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;10,939&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="left"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;8,406&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="left"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;22,775&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;
&lt;td align="left"&gt;$&lt;/td&gt;
&lt;td align="right"&gt;16,560&lt;/td&gt;
&lt;td&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt;&lt;/div&gt; &lt;/div&gt;</NonNumbericText>
          <NonNumericTextHeader>11. EMPLOYEE BENEFIT PLANS
a) Employee option plan
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;In 2001, the Company implemented the Allied World Assurance Company</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 compensation-related costs for share-based compensation which may include disclosure of policies, compensation plan details, allocation of stock compensation, incentive distributions, share-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.</ElementDefenition>
      <ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 123R
 -Paragraph 64, 65, A240

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher AICPA
 -Name Statement of Position (SOP)
 -Number 93-6
 -Paragraph 53

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Staff Accounting Bulletin (SAB)
 -Number Topic 14

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