<?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>0219 - Disclosure - NET INCOME PER SHARE</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 ($)

USD ($) / shares
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margin-bottom:8pt'&gt;&lt;font style="font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0px;"&gt;(19&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;font-weight:bold;"&gt;)&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;font-weight:bold;"&gt;NET INCOME PER SHARE&lt;/font&gt;&lt;/p&gt;&lt;p style='margin-top:0pt; margin-bottom:8pt'&gt;&lt;font style="font-family:Arial;font-size:10pt;margin-left:0px;"&gt;The &lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;following table sets forth the computation of basic and diluted net income per share for the periods indicated&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt; (amounts in thousands)&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;:&lt;/font&gt;&lt;/p&gt;&lt;p style='margin-top: 0pt; margin-bottom: 0pt;'&gt;&lt;/p&gt;&lt;div&gt;&lt;table style="border-collapse:collapse;margin-top:20px;"&gt;&lt;tr style="height: 17px"&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 376px; text-align:left;border-color:#000000;min-width:376px;"&gt;&amp;#160;&lt;/td&gt;&lt;td colspan="5"  style="width: 224px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:224px;"&gt;&lt;font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"&gt;Year Ended December 31,&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 17px"&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 376px; text-align:left;border-color:#000000;min-width:376px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 72px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:72px;"&gt;&lt;font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"&gt;2010&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:64px;"&gt;&lt;font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"&gt;2009&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:64px;"&gt;&lt;font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"&gt;2008&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 17px"&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 376px; text-align:left;border-color:#000000;min-width:376px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 72px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:72px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:64px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:64px;"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 17px"&gt;&lt;td colspan="4"  style="width: 412px; text-align:left;border-color:#000000;min-width:412px;"&gt;&lt;font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"&gt;Shares used in basic earnings per share calculation&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 72px; text-align:right;border-color:#000000;min-width:72px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 60,361&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; text-align:right;border-color:#000000;min-width:64px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 62,891&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; text-align:right;border-color:#000000;min-width:64px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 68,208&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 17px"&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td colspan="3"  style="width: 400px; text-align:left;border-color:#000000;min-width:400px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"&gt;Effect of dilutive securities:&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 72px; text-align:left;border-color:#000000;min-width:72px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; text-align:left;border-color:#000000;min-width:64px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; text-align:left;border-color:#000000;min-width:64px;"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 17px"&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td colspan="2"  style="width: 388px; text-align:left;border-color:#000000;min-width:388px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"&gt;Stock options&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 72px; text-align:right;border-color:#000000;min-width:72px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 874&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; text-align:right;border-color:#000000;min-width:64px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 814&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; text-align:right;border-color:#000000;min-width:64px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 1,370&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 17px"&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td colspan="2"  style="width: 388px; text-align:left;border-color:#000000;min-width:388px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"&gt;Restricted stock units&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 72px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:72px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 557&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:64px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 533&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:64px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; -&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 17px"&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 376px; text-align:left;border-color:#000000;min-width:376px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"&gt;Total effects of dilutive securities&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 72px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:72px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 1,431&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:64px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 1,347&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:64px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 1,370&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 17px"&gt;&lt;td colspan="4"  style="width: 412px; text-align:left;border-color:#000000;min-width:412px;"&gt;&lt;font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"&gt;Shares used in dilutive earnings per share calculation&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 72px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:72px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 61,792&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:64px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 64,238&lt;/font&gt;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:64px;"&gt;&lt;font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"&gt; 69,578&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="height: 17px"&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 376px; text-align:left;border-color:#000000;min-width:376px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 72px; border-top-style:double;border-top-width:3px;text-align:left;border-color:#000000;min-width:72px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; border-top-style:double;border-top-width:3px;text-align:left;border-color:#000000;min-width:64px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"&gt;&amp;#160;&lt;/td&gt;&lt;td   style="width: 64px; border-top-style:double;border-top-width:3px;text-align:left;border-color:#000000;min-width:64px;"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt;&lt;p style='margin-top: 0pt; margin-bottom: 0pt;'&gt;&lt;/p&gt;&lt;p style='margin-top:12pt; margin-bottom:8pt'&gt;&lt;font style="font-family:Arial;font-size:10pt;margin-left:0px;"&gt;For the years ended &lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;December 31, 2010&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;, &lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;2009&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt; and &lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;2008&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;, &lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;0.1&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;&amp;#160;million, 0.&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;4&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;&amp;#160;million and 0.3&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt; million, respectively, of options to purchase shares of common stock were outstanding but not included in the computation of diluted net income per share because &lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;the exercise price exceeded the value of the shares and &lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;the effect would have been anti-dilutive. For the years ended &lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;December 31, 2010, 2009 and 2008&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;, restricted stock units of &lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;1.1&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;&amp;#160;million, &lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;0.8&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt; million, and &lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;1.1&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;&amp;#160;million, respectively, were outstanding but not included in the computation of diluted net income per share because the effect would have been anti-dilutive. For the years ended &lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;December 31, 2010, 2009 and 2008&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;, restricted stock units that vest based on the Company achieving specified operating income performance targets, of &lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;0.1&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt; million, 0.&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;1&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt; million and 0.&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt;4&lt;/font&gt;&lt;font style="font-family:Arial;font-size:10pt;"&gt; million, respectively, were outstanding but not included in the computation of diluted net income per share because they were not determined to be contingently issuable.&lt;/font&gt;&lt;/p&gt;</NonNumbericText><NonNumericTextHeader>(19)&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;NET INCOME PER SHAREThe following table sets forth the computation of basic and diluted net income per share for</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>This element may be used to capture the complete disclosure pertaining to an entity's earnings per share.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 128
 -Paragraph 40

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