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Significant Accounting Policies (Estimated Useful Lives of Property and Equipment) (Details)
12 Months Ended
Dec. 31, 2016
Transportation Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 5 years
Minimum [Member] | Computer Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 3 years
Minimum [Member] | Furniture and Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 5 years
Minimum [Member] | Computer Software [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 5 years
Maximum [Member] | Computer Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 5 years
Maximum [Member] | Furniture and Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 7 years
Maximum [Member] | Computer Software [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 10 years