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Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Property, Plant and Equipment [Line Items]          
Property and equipment, net $ 360,490   $ 360,490   $ 348,259
Depreciation 22,300 $ 19,700 64,600 $ 51,600  
Non-communications          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 293,514   293,514   249,172
Accumulated depreciation (174,263)   (174,263)   (142,270)
Property and equipment, net 119,251   119,251   106,902
Non-communications | Computer equipment and software          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 185,066   $ 185,066   160,319
Non-communications | Computer equipment and software | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     1 year    
Non-communications | Computer equipment and software | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Non-communications | Building and building improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 39,995   $ 39,995   37,904
Non-communications | Building and building improvements | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Non-communications | Building and building improvements | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     48 years    
Non-communications | Office furniture and equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 22,234   $ 22,234   21,245
Non-communications | Office furniture and equipment | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     1 year    
Non-communications | Office furniture and equipment | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     10 years    
Non-communications | Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 9,621   $ 9,621   9,517
Non-communications | Leasehold improvements | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     1 year    
Non-communications | Leasehold improvements | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     15 years    
Non-communications | Transportation equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 4,897   $ 4,897   5,049
Non-communications | Transportation equipment | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Non-communications | Transportation equipment | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     10 years    
Non-communications | Land          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 1,400   $ 1,400   1,400
Non-communications | Construction in progress          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 30,301   30,301   13,738
Communications          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 346,604   346,604   315,254
Accumulated depreciation (105,365)   (105,365)   (73,897)
Property and equipment, net 241,239   241,239   241,357
Communications | Computer equipment and software          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 6,088   $ 6,088   5,574
Communications | Computer equipment and software | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     1 year    
Communications | Computer equipment and software | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Communications | Transportation equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 7,157   $ 7,157   6,611
Communications | Transportation equipment | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     4 years    
Communications | Transportation equipment | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     10 years    
Communications | Land          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 70   $ 70   70
Communications | Construction in progress          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 4,129   4,129   54
Communications | Network plant and fiber          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 273,754   $ 273,754   254,560
Communications | Network plant and fiber | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     4 years    
Communications | Network plant and fiber | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     15 years    
Communications | Customer located property          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 31,844   $ 31,844   27,011
Communications | Customer located property | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     2 years    
Communications | Customer located property | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     4 years    
Communications | Central office          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 19,801   $ 19,801   17,672
Communications | Central office | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Communications | Central office | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     15 years    
Communications | Other          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 3,761   $ 3,761   $ 3,702
Communications | Other | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     1 year    
Communications | Other | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     39 years