Summary of Significant Accounting Policies (Depreciation of Property, Plant and Equipment) (Details)	12 Months Ended
	Dec. 31, 2018
Furniture and Fixtures
Property, Plant and Equipment, Useful Life	5 years
Computer Hardware and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	5 years
Computer Hardware and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	7 years
Computer Software [Member]
Property, Plant and Equipment, Useful Life	5 years
Automobiles and Trucks [Member]
Property, Plant and Equipment, Useful Life	5 years
Websites [Member]
Property, Plant and Equipment, Useful Life	3 years