Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 item	Sep. 30, 2012	Dec. 31, 2012
Segment Information
Number of reportable segments			2
Segment Information
Assets	$ 789,007		$ 789,007		$ 785,092
Operating revenues	97,682	96,647	290,643	288,910
Depreciation and amortization	19,974	18,023	58,532	51,965
Net income	2,061	5,615	7,859	11,343
Capital expenditures			68,599	59,409
Local voice and other retail services
Segment Information
Operating revenues	65,485	64,526	193,003	191,376
Network access services
Segment Information
Operating revenues	32,197	32,121	97,640	97,534
Operating segment | Wireline Services
Segment Information
Assets					784,585
Operating revenues	97,006	95,842	288,559	286,340
Depreciation and amortization	19,974	18,023	58,532	51,965
Net income	1,922	5,557	7,297	10,920
Capital expenditures			68,599	59,409
Operating segment | Wireline Services | Local voice and other retail services
Segment Information
Operating revenues	64,809	63,721	190,919	188,806
Operating segment | Wireline Services | Network access services
Segment Information
Operating revenues	32,197	32,121	97,640	97,534
Operating segment | Other
Segment Information
Assets					507
Operating revenues	1,061	1,114	3,236	3,598
Net income	139	58	562	423
Operating segment | Other | Local voice and other retail services
Segment Information
Operating revenues	1,061	1,114	3,236	3,598
Intersegment Elimination
Segment Information
Operating revenues	(385)	(309)	(1,152)	(1,028)
Intersegment Elimination | Local voice and other retail services
Segment Information
Operating revenues	$ (385)	$ (309)	$ (1,152)	$ (1,028)