CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Service revenue	$ 77,367	$ 66,783	$ 226,406	$ 193,955
Operating expenses:
Network operations (including $122 and $104 and $388 and $246 of equity-based compensation expense for three months and nine months ended September 30, 2011 and 2010 respectively, exclusive of depreciation and amortization shown separately below)	33,619	30,639	98,638	87,961
Selling, general, and administrative (including $1,782 and $1,695 and $5,619 and $4,514 of equity-based compensation expense for three months and nine months ended September 30, 2011 and 2010 respectively)	18,984	17,659	57,450	54,266
Asset impairment				594
Depreciation and amortization	15,188	14,736	44,714	41,712
Total operating expenses	67,791	63,034	200,802	184,533
Operating income	9,576	3,749	25,604	9,422
Interest income and other, net	81	(24)	610	735
Release of lease obligation (Note 2)			2,739
Interest expense	(8,953)	(4,100)	(25,673)	(12,340)
Income (loss) before income taxes	704	(375)	3,280	(2,183)
Income tax (provision) benefit	(423)	(87)	(1,162)	268
Net income (loss)	$ 281	$ (462)	$ 2,118	$ (1,915)
Net income (loss) per common share:
Basic and diluted net income (loss) per common share (in dollars per share)	$ 0.01	$ (0.01)	$ 0.05	$ (0.04)
Weighted-average common shares - basic (in shares)	45,080,859	44,585,230	45,100,004	44,578,107
Weighted-average common shares - diluted (in shares)	45,559,972	44,585,230	45,669,751	44,578,107