Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended									10 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011		Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
Segments [Abstract]
Number of business segments											3
Segment Reporting Information [Line Items]
Revenue from unaffiliated customers											$ 183,196	$ 163,538		$ 162,247
Intersegment revenue											0	0		0
Total operating revenue	46,582	45,813	43,857	46,944	39,564		45,244	40,108	38,622	10,783	183,196	163,538		162,247
Depreciation and amortization											26,746	23,056		22,022
Operating income (loss)	5,090	4,557	4,487	5,252	3,645		6,342	5,002	4,666		19,386	19,655		20,968
Interest expense											5,749	6,275		4,084
Income taxes											5,383	5,042		4,365
Net Income	2,525	1,741	1,738	2,294	1,574		2,133	2,348	2,346	939	8,298	8,401		12,592
Total assets	268,304				243,986					268,304	268,304	243,986		230,188
Property, plant and equipment, net	182,959				154,254					182,959	182,959	154,254		155,077
Additions to property, plant and equipment											30,386	21,440		22,888
Fiber and Data [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated customers											60,109	45,149		44,685
Intersegment revenue											831	773		542
Total operating revenue											60,940	45,922		45,227
Depreciation and amortization											9,923	6,394		5,778
Operating income (loss)											9,801	7,346		7,771
Interest expense											3	2		0
Income taxes											3,865	2,922		3,169
Net Income											5,933	4,423		4,603
Total assets	113,855				73,953	[1]				113,855	113,855	73,953	[1]	67,151	[1]
Property, plant and equipment, net	94,375				59,858					94,375	94,375	59,858		54,732
Additions to property, plant and equipment											19,812	11,553		14,247
Equipment [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated customers											60,133	48,932		47,544
Intersegment revenue											0	0		0
Total operating revenue											60,133	48,932		47,544
Depreciation and amortization											300	302		392
Operating income (loss)											2,507	2,746		2,235
Interest expense											0	0		0
Income taxes											984	1,094		913
Net Income											1,523	1,651		1,348
Total assets	20,866				22,455	[1]				20,866	20,866	22,455	[1]	20,717	[1]
Property, plant and equipment, net	1,430				1,383					1,430	1,430	1,383		1,140
Additions to property, plant and equipment											364	428		217
Telecom [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated customers											62,954	69,457		70,018
Intersegment revenue											1,792	1,632		1,976
Total operating revenue											64,746	71,089		71,994
Depreciation and amortization											16,452	16,270		15,737
Operating income (loss)											7,612	11,283		11,525
Interest expense											39	58		58
Income taxes											2,981	4,472		4,832
Net Income											4,618	6,776		6,652
Total assets	118,899				126,059					118,899	118,899	126,059		132,381
Property, plant and equipment, net	87,092				92,888					87,092	87,092	92,888		99,037
Additions to property, plant and equipment											10,203	9,392		8,424
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated customers											0	0		0
Intersegment revenue											(2,623)	(2,405)		(2,518)
Total operating revenue											(2,623)	(2,405)		(2,518)
Depreciation and amortization											71	90		115
Operating income (loss)											(534)	(1,720)		(563)
Interest expense											5,707	6,215		4,026
Income taxes											(2,447)	(3,446)		(4,549)
Net Income											(3,776)	(4,449)		(11)
Total assets	14,684				21,519					14,684	14,684	21,519		9,939
Property, plant and equipment, net	62				125					62	62	125		168
Additions to property, plant and equipment											$ 7	$ 67		$ 0

[1] Breakout of total assets between the Fiber and Data and Equipment Segments is based on estimates for 2011 and 2010 as the two segments were not accounted for separately. Estimated total assets for the Equipment Segment in 2011 and 2010 do not include goodwill or other intangible assets.