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Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 0000019 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 0000020 - Disclosure - Revenue Revenues (Policies) link:presentationLink link:calculationLink link:definitionLink 0000021 - Disclosure - Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 0000022 - Disclosure - Revenue (Tables) link:presentationLink link:calculationLink link:definitionLink 0000023 - Disclosure - Net Income Per Common Share (Tables) link:presentationLink link:calculationLink link:definitionLink 0000024 - Disclosure - Long-Term Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 0000025 - Disclosure - Business Combinations and Asset Acquisitions (Tables) link:presentationLink link:calculationLink link:definitionLink 0000026 - Disclosure - Supplementary Balance Sheet Information (Tables) link:presentationLink link:calculationLink link:definitionLink 0000027 - 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Disclosure - Net Income Per Common Share Net Income per Common Share (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 0000036 - Disclosure - Net Income Per Common Share (Summary of Calculation of Basic and Diluted EPS) (Details) link:presentationLink link:calculationLink link:definitionLink 0000037 - Disclosure - Long-Term Debt Long-Term Debt (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 0000038 - Disclosure - Long-Term Debt (Schedule Of Debt Instruments) (Details) link:presentationLink link:calculationLink link:definitionLink 0000039 - Disclosure - Long-Term Debt (Schedule Of Aggregate Maturities For Debt Outstanding) (Details) link:presentationLink link:calculationLink link:definitionLink 0000040 - Disclosure - Business Combinations and Asset Acquisitions (Details) link:presentationLink link:calculationLink link:definitionLink 0000041 - Disclosure - Supplementary Balance Sheet Information (Composition Of Property, Plant And Equipment) (Details) link:presentationLink link:calculationLink link:definitionLink 0000042 - Disclosure - Supplementary Balance Sheet Information (Components Of Accounts Payable And Accrued Liabilities) (Details) link:presentationLink link:calculationLink link:definitionLink 0000043 - Disclosure - Supplementary Balance Sheet Information Schedule of Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 0000044 - Disclosure - Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 0000045 - Disclosure - Commitments and Contingencies (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 0000046 - Disclosure - Segment Information (Details) link:presentationLink link:calculationLink link:definitionLink 0000047 - Disclosure - Share Repurchase Program (Details) link:presentationLink link:calculationLink link:definitionLink 0000048 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink