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Significant Accounting Policies Property, Equipment and Depreciation (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment    
Amortization Period of Tires two years  
Communications and Utilities Expense [Member]    
Property, Plant and Equipment    
Depreciation $ 800,000 $ 200,000
Tractors [Member]    
Property, Plant and Equipment    
Property, Plant, and Equipment, Salvage Value 15,000  
Trailers [Member]    
Property, Plant and Equipment    
Property, Plant, and Equipment, Salvage Value $ 4,000  
Minimum [Member] | Land Improvements and Buildings [Member]    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 5 years  
Minimum [Member] | Leasehold Improvements [Member]    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 5 years  
Minimum [Member] | Furniture and Fixtures [Member]    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 3 years  
Minimum [Member] | Shop and Service Equipment [Member]    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 3 years  
Minimum [Member] | Revenue Equipment [Member]    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 5 years  
Maximum [Member] | Land Improvements and Buildings [Member]    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 30 years  
Maximum [Member] | Leasehold Improvements [Member]    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 25 years  
Maximum [Member] | Furniture and Fixtures [Member]    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 5 years  
Maximum [Member] | Shop and Service Equipment [Member]    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 10 years  
Maximum [Member] | Revenue Equipment [Member]    
Property, Plant and Equipment    
Property, Plant and Equipment, Useful Life 7 years