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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 item	Dec. 31, 2013	Dec. 31, 2012
Segment Information
Number of reportable segments									2us-gaap_NumberOfReportableSegments
Segment Information
Operating revenues	$ 99,631us-gaap_Revenues	$ 97,252us-gaap_Revenues	$ 96,784us-gaap_Revenues	$ 97,072us-gaap_Revenues	$ 100,506us-gaap_Revenues	$ 97,682us-gaap_Revenues	$ 96,997us-gaap_Revenues	$ 95,965us-gaap_Revenues	$ 390,739us-gaap_Revenues	$ 391,150us-gaap_Revenues	$ 385,498us-gaap_Revenues
Depreciation and amortization									78,014	77,301	70,908
Operating income (loss)	7,821us-gaap_OperatingIncomeLoss	6,620us-gaap_OperatingIncomeLoss	7,892us-gaap_OperatingIncomeLoss	8,138us-gaap_OperatingIncomeLoss	10,046us-gaap_OperatingIncomeLoss	7,914us-gaap_OperatingIncomeLoss	15,226us-gaap_OperatingIncomeLoss	8,585us-gaap_OperatingIncomeLoss	30,471us-gaap_OperatingIncomeLoss	41,771us-gaap_OperatingIncomeLoss	45,856us-gaap_OperatingIncomeLoss
Capital expenditures									103,706	93,041
Assets	801,968us-gaap_Assets				778,015us-gaap_Assets				801,968us-gaap_Assets	778,015us-gaap_Assets
Telecommunications [Member]
Segment Information
Operating revenues									381,013	389,168
Depreciation and amortization									76,325	76,935
Operating income (loss)									30,683	41,907
Capital expenditures									103,588	92,742
Assets	777,412				758,993				777,412	758,993
Data Center Colocation Services
Segment Information
Operating revenues									10,737	2,188
Depreciation and amortization									1,689	366
Operating income (loss)									(212)	(136)
Capital expenditures									118	299
Assets	24,556				19,022				24,556	19,022
Intersegment Eliminations [Member]
Segment Information
Operating revenues									$ (1,011)	$ (206)