Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)
Segment Information
Operating revenues	$ 99,541	$ 96,187	$ 198,335	$ 193,303
Depreciation and amortization	22,493	21,941	44,443	43,221
Operating income (loss)	6,889	5,260	11,389	11,181
Capital expenditures	29,247	23,724	$ 53,835	46,955
Number of reportable segments | segment			2
Tele-communications
Segment Information
Operating revenues	96,855	93,812	$ 193,040	188,649
Depreciation and amortization	21,964	21,374	43,390	42,102
Operating income (loss)	7,140	5,570	11,752	11,818
Capital expenditures	28,677	23,625	53,089	46,377
Data Center
Segment Information
Operating revenues	3,211	2,784	6,268	5,381
Depreciation and amortization	529	567	1,053	1,119
Operating income (loss)	(251)	(310)	(363)	(637)
Capital expenditures	570	99	746	578
Intersegment Elimination
Segment Information
Operating revenues	$ (525)	$ (409)	$ (973)	$ (727)