Summary of Significant Accounting Policies Property Plant and Equipment, Useful Life (Details)	12 Months Ended
	Dec. 31, 2018
Substation Equipment [Member]
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Capitalized leased assets
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Cloud Computing Equipment [Member]
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Minimum [Member] | Land Improvements [Member]
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Minimum [Member] | Buildings, Building Improvements And Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	3 years 6 months
Minimum [Member] | Data center equipment
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Minimum [Member] | Core Network Equipment [Member]
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Minimum [Member] | Fiber Facilities [Member]
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Minimum [Member] | Computer equipment, furniture and fixtures
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member] | Land Improvements [Member]
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Maximum [Member] | Buildings, Building Improvements And Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Maximum [Member] | Data center equipment
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Maximum [Member] | Core Network Equipment [Member]
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Maximum [Member] | Fiber Facilities [Member]
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	25 years
Maximum [Member] | Computer equipment, furniture and fixtures
Property, Plant and Equipment, Useful Life [Line Items]
Property, Plant and Equipment, Useful Life	5 years