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A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. Class of Stock [Axis] Class of Stock [Axis] Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Advertising [Policy Text Block] Advertising Cost [Policy Text Block] Drawings and Manuals [Member] Drawings and Manuals [Member] Drawings and Manuals. 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Contract with Customer, Liability, Current Contract with Customer, Liability, Current Shares available for grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Leases [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Subsequent Event [Line Items] Subsequent Event [Line Items] Minimum [Member] Minimum [Member] Entities [Table] Entities [Table] Common stock acquired Treasury Stock, Value, Acquired, Cost Method Net amount recognized on the balance sheet Defined Benefit Plan Net Amounts Recognized On Balance Sheet The net amount recognized in the balance sheet associated with the defined benefit plan(s) including the the net pension asset (liability) and accumulated other comprehensive income (loss). 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