Income Taxes (Details Textual) (USD $)	3 Months Ended		6 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2012
Income Tax Contingency [Line Items]
Income tax benefit	$ 18,850,000	$ 18,211,000	$ 46,983,000	$ 42,469,000
Effective tax expense (benefit) rate	30.40%	32.90%	31.80%	33.60%
Federal statutory rate	35.00%
NOL carryforwards	191,500,000		191,500,000
Estimated NOL tax attribute reduction	581,800,000		581,800,000
Expiration period of NOL carryforwards					2022 to 2033
State NOL deferred tax asset	10,500,000		10,500,000
Tax valuation allowance	200,700,000		200,700,000			192,500,000
Federal tax valuation allowance	165,100,000		165,100,000			159,500,000
State tax valuation allowance	35,600,000		35,600,000			33,000,000
Decrease in valuation allowance			1,400,000
Unrecognized tax benefits, total	3,800,000		3,800,000			3,800,000
Unrecognized tax benefits, affect tax rate if recognized	3,800,000		3,800,000
Blackfoot Telecommunications Group [Member]
Income Tax Contingency [Line Items]
Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation			$ 6,700,000