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<link:definition>1011 - Disclosure - Business Combinations</link:definition>
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<link:definition>1012 - Disclosure - Long Term Debt</link:definition>
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<link:definition>1013 - Disclosure - Equity Compensation Plans</link:definition>
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<link:definition>1014 - Disclosure - Income Taxes</link:definition>
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<link:definition>1016 - Disclosure - Defined Contribution Benefit Plan</link:definition>
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<link:definition>1018 - Disclosure - Related Party Transactions</link:definition>
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<link:definition>1019 - Disclosure - Segment Information</link:definition>
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<link:definition>1020 - Disclosure - Stock Repurchases</link:definition>
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<link:definition>1021 - Disclosure - Summary of Significant Accounting Policies (Policies)</link:definition>
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<link:definition>1022 - Disclosure - Summary of Significant Accounting Policies (Tables)</link:definition>
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<link:definition>1023 - Disclosure - Goodwill and Other Intangible Assets (Tables)</link:definition>
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<link:definition>1024 - Disclosure - Equity Compensation Plans (Tables)</link:definition>
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<link:definition>1025 - Disclosure - Income Taxes (Tables)</link:definition>
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<link:definition>1026 - Disclosure - Derivatives (Tables)</link:definition>
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<link:definition>1027 - Disclosure - Segment Information (Tables)</link:definition>
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<link:definition>1028 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)</link:definition>
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<link:definition>1029 - Disclosure - Summary of Significant Accounting Policies - Summary of Changes in  Accumulated Other Comprehensive Income (Loss) net of tax (Detail)</link:definition>
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<link:definition>1030 - Disclosure - Marketable Securities (Detail)</link:definition>
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<link:definition>1031 - Disclosure - Components of marketable securities (Details)</link:definition>
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<link:definition>1032 - Disclosure - Activity in Allowance for Doubtful Accounts (Detail)</link:definition>
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<link:definition>1037 - Disclosure - Weighted Average Remaining Lease Term and Weighted Average Discount Rate (Detail)</link:definition>
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<link:definition>1038 - Disclosure - Components of Lease Expense (Detail)</link:definition>
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<link:definition>1040 - Disclosure - Disaggregated Revenue (Detail)</link:definition>
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<link:definition>1041 - Disclosure - Goodwill and Other Intangible Assets - Additional Information (Detail)</link:definition>
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<link:definition>1042 - Disclosure - Goodwill by Business Segment (Detail)</link:definition>
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<link:definition>1044 - Disclosure - Business Combinations - Additional Information (Detail)</link:definition>
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<link:definition>1045 - Disclosure - Long Term Debt - Additional Information (Detail)</link:definition>
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<link:definition>1046 - Disclosure - Equity Compensation Plans - Additional Information (Detail)</link:definition>
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<link:definition>1047 - Disclosure - Stock Option Activity (Detail)</link:definition>
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<link:definition>1048 - Disclosure - Stock Option Activity (Parenthetical) (Detail)</link:definition>
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<link:definition>1049 - Disclosure - Summary of Stock Options Outstanding (Detail)</link:definition>
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<link:definition>1050 - Disclosure - Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options Intrinsic Value (Detail)</link:definition>
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<link:definition>1051 - Disclosure - Equity Compensation Plans - Schedule Of Nonvested Restricted Stock Units Activity (Detail)</link:definition>
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<link:definition>1052 - Disclosure - Income Before Income Taxes (Detail)</link:definition>
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<link:definition>1053 - Disclosure - Provision for Income Taxes (Detail)</link:definition>
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<link:definition>1054 - Disclosure - Reconciliation of Income Taxes Computed at the U.S. Federal Statutory Tax Rate to Income Tax Expense (Detail)</link:definition>
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<link:definition>1055 - Disclosure - Income Taxes - Additional Information (Detail)</link:definition>
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<link:definition>1057 - Disclosure - Operating Loss Carry forwards (Detail)</link:definition>
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<link:definition>1058 - Disclosure - Reconciliation of Our Tax Contingencies (Detail)</link:definition>
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