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Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Diluted (in shares) Weighted-average number of shares-diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Fair Value, Recurring Fair Value, Recurring [Member] Income taxes Income Tax Disclosure [Text Block] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Debt instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Equity Stockholders' Equity Note Disclosure [Text Block] Derivative Instruments Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Other income (expense): Nonoperating Income (Expense) [Abstract] Credit Facility [Axis] Credit Facility [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Net cash used in investing activities: Net Cash Provided by (Used in) Investing Activities Buildings, building improvements and leasehold improvements Building and Building Improvements [Member] Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Cash flows (used in) provided by operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Basis of presentation Consolidation, Policy [Policy Text Block] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Total current liabilities Liabilities, Current Taxes paid for share-based compensation activity Payment, Tax Withholding, Share-based Payment Arrangement Money market accounts Money Market Funds [Member] Foreign currency translation Goodwill, Foreign Currency Translation Gain (Loss) Entity Address, Postal Zip Code Entity Address, Postal Zip Code Amended Credit Agreement Amended Credit Agreement [Member] Amended credit agreement dated October 15, 2018. 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Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Deferred income taxes Deferred Income Tax Expense (Benefit) Other Assets