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Property and Equipment (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]          
Property and equipment, net $ 339,730,000   $ 339,730,000   $ 248,051,000
Depreciation 15,100,000 $ 7,700,000 41,100,000 $ 20,600,000  
Impairment charge 3,900,000 $ 0 3,907,000 $ 0  
Non-communications [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 237,562,000   237,562,000   182,248,000
Accumulated depreciation (119,535,000)   (119,535,000)   (105,017,000)
Property and equipment, net 118,027,000   118,027,000   77,231,000
Non-communications [Member] | Computer Equipment and Software [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 146,831,000   $ 146,831,000   124,708,000
Non-communications [Member] | Computer Equipment and Software [Member] | Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     1 year    
Non-communications [Member] | Computer Equipment and Software [Member] | Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Non-communications [Member] | Building [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 49,128,000   $ 49,128,000   24,003,000
Non-communications [Member] | Building [Member] | Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Non-communications [Member] | Building [Member] | Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     48 years    
Non-communications [Member] | Furniture and Fixtures [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 22,445,000   $ 22,445,000   15,210,000
Non-communications [Member] | Furniture and Fixtures [Member] | Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     1 year    
Non-communications [Member] | Furniture and Fixtures [Member] | Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     10 years    
Non-communications [Member] | Leasehold Improvements [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 9,310,000   $ 9,310,000   7,759,000
Non-communications [Member] | Leasehold Improvements [Member] | Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     1 year    
Non-communications [Member] | Leasehold Improvements [Member] | Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     15 years    
Non-communications [Member] | Transportation Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 4,447,000   $ 4,447,000   3,813,000
Non-communications [Member] | Transportation Equipment [Member] | Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     4 years    
Non-communications [Member] | Transportation Equipment [Member] | Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     10 years    
Non-communications [Member] | Land [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 3,328,000   $ 3,328,000   2,628,000
Non-communications [Member] | Construction in Progress [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 2,073,000   2,073,000   4,127,000
Communications [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 253,215,000   253,215,000   186,398,000
Accumulated depreciation (31,512,000)   (31,512,000)   (15,578,000)
Property and equipment, net 221,703,000   221,703,000   170,820,000
Communications [Member] | Computer Equipment and Software [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 4,988,000   $ 4,988,000   3,790,000
Communications [Member] | Computer Equipment and Software [Member] | Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     1 year    
Communications [Member] | Computer Equipment and Software [Member] | Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Communications [Member] | Transportation Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 6,379,000   $ 6,379,000   5,759,000
Communications [Member] | Transportation Equipment [Member] | Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     4 years    
Communications [Member] | Transportation Equipment [Member] | Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     10 years    
Communications [Member] | Land [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 70,000   $ 70,000   70,000
Communications [Member] | Construction in Progress [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 11,364,000   11,364,000   11,620,000
Communications [Member] | Network plant and fiber [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 195,015,000   $ 195,015,000   138,122,000
Communications [Member] | Network plant and fiber [Member] | Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Communications [Member] | Network plant and fiber [Member] | Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     15 years    
Communications [Member] | Customer located property [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 19,146,000   $ 19,146,000   13,767,000
Communications [Member] | Customer located property [Member] | Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Communications [Member] | Customer located property [Member] | Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     10 years    
Communications [Member] | Central office [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 13,584,000   $ 13,584,000   10,754,000
Communications [Member] | Central office [Member] | Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Communications [Member] | Central office [Member] | Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     15 years    
Communications [Member] | Other Capitalized Property Plant and Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 2,669,000   $ 2,669,000   $ 2,516,000
Communications [Member] | Other Capitalized Property Plant and Equipment [Member] | Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     1 year    
Communications [Member] | Other Capitalized Property Plant and Equipment [Member] | Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Useful life     39 years