Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) segment	Mar. 31, 2015 USD ($)
Segment Information
Operating revenues	$ 98,794	$ 97,114
Depreciation and amortization	21,950	21,280
Operating income (loss)	4,500	5,919
Capital expenditures	$ 24,588	23,231
Number of reportable segments | segment	2
Tele-communications
Segment Information
Operating revenues	$ 96,185	94,836
Depreciation and amortization	21,426	20,728
Operating income (loss)	4,611	6,246
Capital expenditures	24,412	22,752
Data Center Colocation
Segment Information
Operating revenues	3,057	2,597
Depreciation and amortization	524	552
Operating income (loss)	(111)	(327)
Capital expenditures	176	479
Intersegment Elimination
Segment Information
Operating revenues	$ (448)	$ (319)