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Significant Accounting Policies (Estimated Useful Lives of Property and Equipment) (Details)
12 Months Ended
Dec. 31, 2020
Computer Equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 3 years
Computer Equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 5 years
Furniture and Equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 5 years
Furniture and Equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 7 years
Transportation Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 5 years
Computer Software [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 3 years
Computer Software [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 10 years
Leasehold Improvements [Member]  
Property, Plant and Equipment [Line Items]  
Leasehold improvements Lesser of useful life or lease term