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Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS - Cash Reconciliation link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - Nature of Business link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - Sales of Subsidiary Businesses link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - Investments Securities and Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - Property and Equipment, net link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - Capitalized Software Development Costs, net link:presentationLink link:calculationLink link:definitionLink 0000017 - Disclosure - Goodwill and Intangible Assets, Net link:presentationLink link:calculationLink link:definitionLink 0000018 - Disclosure - Accrued Employee Expenses link:presentationLink link:calculationLink link:definitionLink 0000019 - Disclosure - Other Current Liabilities link:presentationLink link:calculationLink link:definitionLink 0000020 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 0000021 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 0000022 - Disclosure - Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 0000023 - Disclosure - Stock-Based Compensation link:presentationLink link:calculationLink link:definitionLink 0000024 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 0000025 - Disclosure - Revenue and Other Information link:presentationLink link:calculationLink link:definitionLink 0000026 - Disclosure - Workforce Reduction link:presentationLink link:calculationLink link:definitionLink 0000027 - Disclosure - Retirement Plans link:presentationLink link:calculationLink link:definitionLink 9954471 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9954472 - Disclosure - Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 9954473 - Disclosure - Investments Securities and Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 9954474 - Disclosure - Property and Equipment, net (Tables) link:presentationLink link:calculationLink link:definitionLink 9954475 - Disclosure - Capitalized Software Development Costs, net (Tables) link:presentationLink link:calculationLink link:definitionLink 9954476 - Disclosure - Goodwill and Intangible Assets, Net (Tables) link:presentationLink link:calculationLink link:definitionLink 9954477 - Disclosure - Accrued Employee Expenses (Tables) link:presentationLink link:calculationLink link:definitionLink 9954478 - Disclosure - Other Current Liabilities (Tables) link:presentationLink link:calculationLink link:definitionLink 9954479 - 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Disclosure - Summary of Significant Accounting Policies - Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9954488 - Disclosure - Sales of Subsidiary Businesses - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954489 - Disclosure - Investments Securities and Fair Value Measurements - Investment Securities (Details) link:presentationLink link:calculationLink link:definitionLink 9954490 - Disclosure - Investments Securities and Fair Value Measurements - Available-for-sale Investments, by Remaining Contract Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 9954491 - Disclosure - Investments Securities and Fair Value Measurements - Sales and Maturities (Details) link:presentationLink link:calculationLink link:definitionLink 9954492 - Disclosure - Investments Securities and Fair Value Measurements - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954493 - Disclosure - Investments Securities and Fair Value Measurements - Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 9954494 - Disclosure - Property and Equipment, net (Details) link:presentationLink link:calculationLink link:definitionLink 9954495 - Disclosure - Capitalized Software Development Costs, net - Software Development Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9954496 - Disclosure - Capitalized Software Development Costs, net - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954497 - Disclosure - Capitalized Software Development Costs, net - Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954498 - Disclosure - Goodwill and Intangible Assets, Net - Finite-Lived Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9954499 - Disclosure - Goodwill and Intangible Assets, Net - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954500 - 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Leases - Lease Related Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954508 - Disclosure - Leases - Schedule of Minimum Lease payments Under Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9954508 - Disclosure - Leases - Schedule of Minimum Lease payments Under Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9954509 - Disclosure - Commitments and Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 9954510 - Disclosure - Stockholders' Equity - Amended and Restated Certificate of Incorporation (Details) link:presentationLink link:calculationLink link:definitionLink 9954511 - Disclosure - Stockholders' Equity - Class A Common Stock and Class B Common Stock (Details) link:presentationLink link:calculationLink link:definitionLink 9954512 - Disclosure - Stockholders' Equity - Preferred Stock (Details) link:presentationLink link:calculationLink link:definitionLink 9954513 - 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