Long-Lived Assets (Details 2) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Subject to amortization
Gross Carrying Value	$ 17,650,000		$ 17,650,000		$ 18,060,000
Accumulated Amortization	7,613,000		7,613,000		6,285,000
Net Carrying Value	10,037,000		10,037,000		11,775,000
Not subject to amortization
Carrying Value	27,300,000		27,300,000		27,300,000
Total intangible assets
Gross Carrying Value	44,950,000		44,950,000		45,360,000
Accumulated Amortization	7,613,000		7,613,000		6,285,000
Net Carrying Value	37,337,000		37,337,000		39,075,000
Amortization expense	700,000	700,000	1,300,000	1,400,000
Estimated amortization expense
2013 (remaining months)	1,329,000		1,329,000
2014	2,257,000		2,257,000
2015	1,917,000		1,917,000
2016	1,577,000		1,577,000
2017	1,237,000		1,237,000
Thereafter	1,720,000		1,720,000
Net Carrying Value	10,037,000		10,037,000		11,775,000
Wireline Services | Wavecom
Total intangible assets
Goodwill recognized in conjunction with the acquisition	1,400,000		1,400,000
Customer relationships
Subject to amortization
Gross Carrying Value	17,440,000		17,440,000		17,850,000
Accumulated Amortization	7,558,000		7,558,000		6,285,000
Net Carrying Value	9,882,000		9,882,000		11,565,000
Total intangible assets
Accumulated Amortization	7,558,000		7,558,000		6,285,000
Estimated amortization expense
Net Carrying Value	9,882,000		9,882,000		11,565,000
Trade name and other
Subject to amortization
Gross Carrying Value	210,000		210,000		210,000
Accumulated Amortization	55,000		55,000
Net Carrying Value	155,000		155,000		210,000
Total intangible assets
Accumulated Amortization	55,000		55,000
Estimated amortization expense
Net Carrying Value	$ 155,000		$ 155,000		$ 210,000