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Equity Method Investments in Affiliates - Financial Information for Affiliates Accounted for Under the Equity Method (Details) link:presentationLink link:calculationLink link:definitionLink 2313301 - Disclosure - Equity Method Investments in Affiliates (Tables) link:presentationLink link:calculationLink link:definitionLink 2111100 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 2411403 - Disclosure - Fair Value Measurements - Changes in Level 3 Financial Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2411402 - Disclosure - Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 2411406 - Disclosure - Fair Value Measurements - Financial Liabilities not Carried at Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 2411405 - Disclosure - Fair Value Measurements - Nature of Investments and Related Liquidity (Details) link:presentationLink link:calculationLink link:definitionLink 2411404 - Disclosure - Fair Value Measurements - Quantitative Information About Level 3 (Details) link:presentationLink link:calculationLink link:definitionLink 2311301 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 2114100 - Disclosure - Fixed Assets and Lease Commitments link:presentationLink link:calculationLink link:definitionLink 2414403 - Disclosure - Fixed Assets and Lease Commitments - Aggregate Future Minimum Payments for Operating Leases and Rent Expense (Details) link:presentationLink link:calculationLink link:definitionLink 2414402 - Disclosure - Fixed Assets and Lease Commitments (Details) link:presentationLink link:calculationLink link:definitionLink 2314301 - Disclosure - Fixed Assets and Lease Commitments (Tables) link:presentationLink link:calculationLink link:definitionLink 2108100 - 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Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 2427401 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink