<?xml version="1.0" encoding="US-ASCII"?>
<!-- RR Donnelley Xcelerate Taxonomy Schema, based on XBRL 2.1  http://www.rrdonnelley.com/ -->
<!-- Version: 6.21.0 -->
<!-- Round: 6 -->
<!-- Creation date: 2013-07-23T23:48:39Z -->
<!-- Copyright (c) 2005-2013 R.R. Donnelley & Sons Company All Rights Reserved. -->
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        <link:definition>101 - Document - Document and Entity Information</link:definition>
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        <link:definition>103 - Statement - Condensed Consolidated Balance Sheets</link:definition>
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        <link:definition>104 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</link:definition>
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        <link:definition>105 - Statement - Condensed Consolidated Statements of Income</link:definition>
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        <link:definition>106 - Statement - Condensed Consolidated Statements of Comprehensive Income</link:definition>
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        <link:definition>107 - Statement - Condensed Consolidated Statement of Shareholders' Equity</link:definition>
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        <link:definition>108 - Statement - Condensed Consolidated Statements of Cash Flows</link:definition>
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        <link:definition>109 - Disclosure - Basis of Presentation</link:definition>
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        <link:definition>110 - Disclosure - Income Taxes</link:definition>
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        <link:definition>111 - Disclosure - Stock Based Compensation</link:definition>
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        <link:definition>112 - Disclosure - Earnings Per Share</link:definition>
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        <link:definition>113 - Disclosure - Marketable Securities</link:definition>
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        <link:definition>114 - Disclosure - Business Segments</link:definition>
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        <link:definition>115 - Disclosure - Collaborative Arrangement</link:definition>
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        <link:definition>116 - Disclosure - Stock Based Compensation (Tables)</link:definition>
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        <link:definition>117 - Disclosure - Earnings Per Share (Tables)</link:definition>
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        <link:definition>118 - Disclosure - Marketable Securities (Tables)</link:definition>
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        <link:definition>119 - Disclosure - Business Segments (Tables)</link:definition>
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        <link:definition>120 - Disclosure - Income Taxes - Additional Information (Detail)</link:definition>
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        <link:definition>121 - Disclosure - Stock Based Compensation - Additional Information (Detail)</link:definition>
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        <link:definition>122 - Disclosure - Stock Based Compensation - Stock Based Compensation Expense Recorded in Condensed Consolidated Statements of Income (Detail)</link:definition>
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        <link:definition>123 - Disclosure - Earnings Per Share - Additional Information (Detail)</link:definition>
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        <link:definition>124 - Disclosure - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>125 - Disclosure - Marketable Securities - Fair Value of Available for Sale Marketable Securities (Detail)</link:definition>
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        <link:definition>126 - Disclosure - Business Segments - Business Segment Information Based on Net Revenues and Net Income from Operations (Detail)</link:definition>
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        <link:definition>127 - Disclosure - Business Segments - Business Segment Information Based on Assets (Detail)</link:definition>
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        <link:definition>128 - Disclosure - Collaborative Arrangement - Additional Information (Detail)</link:definition>
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