CenturyLink Merger (Details)	3 Months Ended
	Mar. 31, 2017 $ / shares	Dec. 31, 2016 $ / shares	Oct. 31, 2016 $ / shares
Business Combinations [Abstract]
Business acquisition, date of acquisition agreement	Oct. 31, 2016
stock conversion ratio			1.4286
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 1.00
Cash consideration per share (in dollars per share)			$ 26.50