Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 248,051	$ 123,786
Depreciation expense	30,200	22,400	$ 16,500
Non-Communications [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	182,248	148,440
Accumulated depreciation	105,017	91,285
Property and equipment, net	77,231	57,155
Non-Communications [Member] | Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	$ 124,708	97,317
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] | Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	$ 15,210	12,344
Non-Communications [Member] | Office Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life	3 years
Non-Communications [Member] | Office Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life	7 years
Non-Communications [Member] | Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	$ 24,003	13,363
Non-Communications [Member] | Building and building improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life	5 years
Non-Communications [Member] | Building and building improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life	39 years
Non-Communications [Member] | Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	$ 3,813	3,809
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] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	$ 7,759	3,579
Non-Communications [Member] | Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life	5 years
Non-Communications [Member] | Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life	15 years
Non-Communications [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	$ 2,628	1,682
Non-Communications [Member] | Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	4,127	16,346
Communications [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	186,398	71,297
Accumulated depreciation	15,578	4,666
Property and equipment, net	170,820	66,631
Communications [Member] | Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	$ 3,790	2,026
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 plant gross	$ 5,759	2,966
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 plant gross	$ 70	70
Communications [Member] | Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	11,620	12,537
Communications [Member] | Network plant and fiber [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	$ 138,122	40,844
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] | Central office [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	$ 10,754	6,448
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] | Customer located property [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	$ 13,767	5,138
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] | Other [Member]
Property, Plant and Equipment [Line Items]
Property and plant gross	$ 2,516	$ 1,268
Communications [Member] | Other [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life	1 year
Communications [Member] | Other [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life	39 years