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exercise price, shares exercisable (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Phantom shares issuable (in shares) Dividends, Common Stock, Stock, Issuable Dividends, Common Stock, Stock, Issuable Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Unused capacity, commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Proceeds from exercise of stock options Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised CSS deposits Deposit Liability, Current Aircraft Air Transportation Equipment [Member] Subscriptions Subscription and Circulation [Member] Hosted Software Solutions Hosted Software Solutions [Member] Hosted Software Solutions Private Placement Private Placement [Member] Company's adjusted Management Reported Operating Income (MORI) threshold for bonus plan (up to) Deferred Compensation Arrangement With Individual, Management Report Operating Income Funding Threshold Deferred Compensation Arrangement With Individual, Management Report Operating Income Funding Threshold Earnings Per Share Earnings Per Share [Text Block] Borrowings guaranteed through stock of foreign subsidiaries (as a percent) Line of Credit Facility, Borrowings Guaranteed through Stock of Foreign Subsidiaries, Percentage Line of Credit Facility, Borrowings Guaranteed through Stock of Foreign Subsidiaries, Percentage Organization, Consolidation and Presentation of Financial Statements [Abstract] Deferred compensation plan Deferred Compensation Liability, Fair Value Disclosure Deferred Compensation Liability, Fair Value Disclosure Other Other Capitalized Property Plant and Equipment [Member] Current liabilities: Liabilities, Current [Abstract] Entity Shell Company Entity Shell Company Americas United States, Canada, And Latin America [Member] United States, Canada, And Latin America Fair Value, Recurring Fair Value, Recurring [Member] Shares withheld for tax withholding obligation (in shares) Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Debt covenant, cross-defaults of other debt threshold Debt Covenant, Cross-Defaults Of Other Debt Threshold Debt Covenant, Cross-Defaults Of Other Debt Threshold Recent Accounting Pronouncements and Recently Adopted Accounting Guidance New Accounting Pronouncements, Policy [Policy Text Block] Statement of Financial Position [Abstract]