Discontinued Operations (Details) (USD $)	3 Months Ended			12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013		Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 0	$ 30,315,000		$ 30,500,000
Blackfoot Telecommunications Group
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation		6,700,000
Discontinued Operations, Gain on Disposal of Assets, GAAP		16,700,000
Discontinued Operations, Gain on Disposal of Assets, Tax Basis		27,100,000
Income Statement Disclosures:
Revenue		674,000	[1]
Income before income taxes		$ 477,000	[1]

[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.