Income Taxes (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Tax Contingency [Line Items]
Income tax benefit	$ 11,249,000	$ 14,218,000	$ 28,053,000	$ 61,201,000
Effective tax expense (benefit) rate	22.90%	61.30%	23.20%	35.80%
Federal statutory rate			35.00%
NOL carryforwards	212,500,000		212,500,000
Estimated NOL tax attribute reduction	581,800,000		581,800,000
State NOL deferred tax asset	11,200,000		11,200,000
Tax valuation allowance	184,500,000		184,500,000		166,800,000
Federal tax valuation allowance	150,500,000		150,500,000		136,400,000
State tax valuation allowance	34,000,000		34,000,000		30,400,000
Unrecognized tax benefits, total	3,800,000		3,800,000		4,900,000
Unrecognized Tax Benefits, Period Increase (Decrease)			1,100,000
Unrecognized tax benefits, affect tax rate if recognized	3,800,000		3,800,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	100,000		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, 2034
Federal
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities			600,000
Unrecognized Tax Benefits, Income Tax Penalties Expense			500,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense			100,000
State
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities			$ 500,000