Quarterly financial information (unaudited):

12 Months Ended

Dec. 31, 2013

Quarterly financial information (unaudited):

Quarterly financial information (unaudited):

11. Quarterly financial information (unaudited):

	Three months ended
	March 31, 2013		June 30, 2013		September 30, 2013		December 31, 2013(1)(2)
	(in thousands, except share and per share amounts)
Service revenue	$	84,553	$	85,803	$	87,761	$	89,859
Network operations, including equity-based compensation expense		37,309		37,076		37,441		38,400
Operating income		9,905		11,601		12,577		12,065
Net income		361		1,607		2,122		52,599
Net income per common share—basic		0.01		0.03		0.05		1.14
Net income per common share—diluted		0.01		0.03		0.05		1.10
Weighted-average number of common shares—basic		45,537,607		46,040,692		46,171,194		46,302,926
Weighted-average number of common shares—diluted		46,435,677		46,769,184		46,823,167		48,800,560

(1)

As described in Note 5, during the fourth quarter of 2013 the Company reversed its valuation allowance against its US federal and certain state deferred income tax assets.

(2)

Diluted earnings per share for the fourth quarter of 2013 assumes the conversion of the Convertible Notes since the Convertible Notes are dilutive this quarter. The assumed conversion of the Convertible Notes was anti-dilutive for the other periods presented. Diluted earnings per share for the fourth quarter of 2013 is determined by adding back $1.2 million of interest expense from the Convertible Notes to net income and including 1.9 million shares from the assumed conversion of the Convertible Notes in the weighted-average number of common dilutive shares.

	Three months ended
	March 31, 2012			June 30, 2012			September 30, 2012			December 31, 2012
	(in thousands, except share and per share amounts)
Service revenue	$	76,888		$	77,817		$	79,656		$	82,612
Network operations, including equity-based compensation expense		34,338			35,112			36,541			37,651
Operating income		5,968			7,801			8,032			9,169
Net (loss)		(2,090	)		(1,791	)		(94	)		(276	)
Net (loss) per common share—basic and diluted		(0.05	)		(0.04	)		(0.00	)		(0.01	)
Weighted-average number of common shares—basic and diluted		45,241,418			45,313,804			45,377,732			45,492,847