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Contractual life maximum Employee Incentive Plans Options Contractual Life Maximum Employeeincentiveplansoptionscontractuallifemaximum - maximum number of years for the company's stock options before they expire Current liabilities: Liabilities, Current [Abstract] United States tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Entity Shell Company Entity Shell Company Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Fair Value, Measurements, Recurring [Member] Fair Value, Recurring [Member] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Other, net Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Entity Public Float Entity Public Float Statement of Financial Position [Abstract] Statement of Financial Position [Abstract]