CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Service revenue	$ 75,580	$ 64,395	$ 149,039	$ 127,170
Operating expenses:
Network operations (including $126 and $95 and $266 and $142 of equity-based compensation expense for three months and six months ended June 30, 2011 and 2010 respectively, exclusive of depreciation and amortization shown separately below)	33,249	29,224	65,021	57,323
Selling, general, and administrative (including $1,881 and $1,701 and $3,837 and $2,818 of equity-based compensation expense for three months and six months ended June 30, 2011 and 2010 respectively)	18,926	18,091	38,465	36,608
Asset impairment				594
Depreciation and amortization	14,734	14,099	29,525	26,975
Total operating expenses	66,909	61,414	133,011	121,500
Operating income	8,671	2,981	16,028	5,670
Interest income and other, net	298	383	529	762
Release of lease obligation (Note 2)	2,739		2,739
Interest expense	(9,135)	(4,148)	(16,720)	(8,241)
Income (loss) before income taxes	2,573	(784)	2,576	(1,809)
Income tax (provision) benefit	(458)	(99)	(739)	356
Net income (loss)	$ 2,115	$ (883)	$ 1,837	$ (1,453)
Net income (loss) per common share:
Basic net income (loss) per common share (in dollars per share)	$ 0.05	$ (0.02)	$ 0.04	$ (0.03)
Diluted net income (loss) per common share (in dollars per share)	$ 0.05	$ (0.02)	$ 0.04	$ (0.03)
Weighted-average common shares - basic (in shares)	45,021,507	44,525,633	45,017,518	44,521,667
Weighted-average common shares - diluted (in shares)	45,548,725	44,525,633	45,575,535	44,521,667