Commitments and Contingencies (Details) (USD $)	3 Months Ended	12 Months Ended		32 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013
National Telecommunications Information Administration Broadband Technology Opportunities Program grant [Abstract]
Approximate amount of capital expenditure for advanced high-capacity broadband network pursuant to Broadband Technology Opportunities Program (BTOP) grant	$ 24,000,000
Approximate amount of reimbursement pursuant to NTIA Grant	16,800,000
Estimated Investment on Project	7,200,000
Estimated Investment On Project Percentage	30.00%
Capital expenditure incurred	233,000	7,081,000	12,664,000	19,978,000
Capital expenditure pending reimbursement from NTIA	1,275,000	1,100,000	1,920,000	1,275,000
NTIA reimbursements received	$ 0	$ 5,745,000	$ 6,945,000	$ 12,690,000
Project Completion Date	Jul. 31, 2013