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[Member] Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent Net Periodic Pension Cost Schedule of Net Benefit Costs [Table Text Block] Cash used for investing activities Net Cash Provided by (Used in) Investing Activities Outstanding, weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Stock-based compensation activity: Share-based Payment Arrangement, Noncash Expense [Abstract] A-TSR less than 50% and greater than or equal to 20% [Member] Share-Based Compensation Award, Performance Criteria, Absolute Total Shareholder Return Milestones, Less Than 50 Percent And Greater Than Or Equal To 20 Percent [Member] Share-Based Compensation Award, Performance Criteria, Absolute Total Shareholder Return Milestones, Less Than 50 Percent And Greater Than Or Equal To 20 Percent [Member] Award Type [Domain] Award Type [Domain] Cash paid to settle vested units Share-based compensation Arrangement by Share based Payment Award, Cash Paid to Settle Vested Instruments Share-based compensation Arrangement by Share based Payment Award, Cash Paid to Settle Vested Instruments New Accounting Guidance Description Of New Accounting Pronouncements Recently Adopted And Not Yet Adopted [Text Block] Description Of New Accounting Pronouncements Recently Adopted and Not Yet Adopted Debt Instrument [Line Items] Debt Disclosure [Line Items] Debt Disclosure [Line Items] Trading Symbol Trading Symbol Exercisable at end of period (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Less: Treasury stock at cost, 3,684,965 and 4,491,429 shares, respectively Treasury Stock, Value Earnings Per Share Earnings Per Share [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Current liabilities: Liabilities, Current [Abstract] Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Entity Shell Company Entity Shell Company Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Vested or expected to vest at end of period (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Borrowings under credit facility Proceeds from Lines of Credit Statement of Financial Position [Abstract] Statement of Financial Position [Abstract]