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Nature Of Business And Summary Of Significant Accounting Policies (Estimated Useful Lives By Class Of Assets) (Details)
12 Months Ended
Dec. 31, 2016
Building and Improvements [Member]  
Property, Plant and Equipment [Line Items]  
Useful life 10 years
Furniture and Fixtures [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Useful life 5 years
Furniture and Fixtures [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Useful life 10 years
Vehicles, Dozers, And Other Light Operating Equipment And Systems [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Useful life 3 years
Vehicles, Dozers, And Other Light Operating Equipment And Systems [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Useful life 5 years
Heavy Operating Equipment (Dredges And Barges) [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Useful life 10 years
Heavy Operating Equipment (Dredges And Barges) [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Useful life 30 years