Assets Held for Sale and Discontinued Operations (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Jan. 31, 2013 employee	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business		$ 30,452,000		$ 0
Assets held for sale:
Total assets held for sale		0				12,549,000
Liabilities held for sale:
Total liabilities held for sale		0				407,000
Blackfoot Telecommunications Group
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of employees who joined Blackfoot organization					11
Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation		6,700,000
Discontinued Operations, Gain on Disposal of Assets, GAAP		16,900,000
Discontinued Operations, Gain on Disposal of Assets, Tax Basis		27,100,000
Assets held for sale:
Accounts receivable, net						261,000
Prepaid expenses						37,000
Other current assets						3,000
Property, plant and equipment (net of $4.6 million accumulated depreciation)						6,441,000
Accumulated depreciation						4,600,000
Other assets						5,807,000
Total assets held for sale						12,549,000
Liabilities held for sale:
Accounts payable						137,000
Other accrued liabilities						148,000
Other long-term liabilities						122,000
Total liabilities held for sale						407,000
Income Statement Disclosures:
Revenue	1,984,000	674,000	[1]	5,927,000
Income (loss) before income taxes	$ 406,000	$ 477,000	[1]	$ 1,075,000

[1] Reflects revenue and income before income taxes of the Idaho-based operations for the period of January 1, 2013 through the completion of the transaction on January 31, 2013.