Commitments and Contingencies (Details) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) item	Sep. 30, 2015 USD ($)	Aug. 31, 2014 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
CAF annual funding	$ 4.4
Period of support service				6 years
Number Of Eligible Locations To Offer Broadband | item				11,000
Revenue recognized from CAF first year funds		$ 1.1	$ 2.2	$ 3.3	$ 2.2
Jointly owned utility plant
Jointly Owned Utility Plant Interests [Line Items]
Cost of construction						$ 235.0
Company investment in construction costs of plant						$ 25.0
Paid to the cable contractor for the cable build		13.6		$ 13.6
Period of up-front payment received				25 years
Proceeds from sale of capacity				$ 27.0
Up Front Payment Received				5.7
Escrow deposit		$ 3.5		$ 3.5
Minimum
Jointly Owned Utility Plant Interests [Line Items]
Downstream broadband service data transfer rate (Mbps)				10
Upstream broadband service data transfer rate (Mbps)				1