Segment Information (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Information on revenue, net of intersegment eliminations, by product group
Revenue	$ 96,187	$ 96,784	$ 193,303	$ 193,856
Local voice and other retail services
Information on revenue, net of intersegment eliminations, by product group
Revenue	63,142	62,951	126,354	125,887
Network access services
Information on revenue, net of intersegment eliminations, by product group
Revenue	30,261	31,510	61,568	63,241
Data center colocation
Information on revenue, net of intersegment eliminations, by product group
Revenue	$ 2,784	$ 2,323	$ 5,381	$ 4,728