Income Taxes (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Income Tax Contingency [Line Items]
Income tax benefit	$ 9,670,000	$ 28,133,000
Effective tax expense (benefit) rate	23.10%	32.80%
Federal statutory rate	35.00%
NOL carryforwards	200,200,000
Estimated NOL tax attribute reduction	581,800,000
State NOL deferred tax asset	10,400,000
Tax valuation allowance	172,200,000		166,800,000
Federal tax valuation allowance	140,700,000		136,400,000
State tax valuation allowance	31,500,000		30,400,000
Unrecognized tax benefits, total	4,900,000		4,900,000
Unrecognized Tax Benefits, Reduction of Net Operating Loss	3,800,000
Unrecognized tax benefits, affect tax rate if recognized	4,500,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	100,000		0
Blackfoot Telecommunications Group
Income Tax Contingency [Line Items]
Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation		$ 6,700,000
Minimum
Income Tax Contingency [Line Items]
Expiration period of NOL carryforwards	Dec. 31, 2021
Maximum
Income Tax Contingency [Line Items]
Expiration period of NOL carryforwards	Dec. 31, 2033