Related Party Transactions (Details) - ValleyNet [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Revenue from related parties	$ 2.4	$ 2.7	$ 3.0
Accounts receivable from related parties	0.2	0.2
Expenses from transactions with related party	$ 3.0	$ 2.4	$ 2.3