Quarterly financial information (unaudited):

12 Months Ended

Dec. 31, 2017

Quarterly financial information (unaudited):

Quarterly financial information (unaudited):

11. Quarterly financial information (unaudited):

	Three months ended
	March 31, 2017		June 30, 2017		September 30, 2017		December 31, 2017(a)
	(in thousands, except share and per share amounts)
Service revenue	$	117,203	$	119,777	$	122,969	$	125,226
Network operations, including equity-based compensation expense		50,662		51,115		53,584		53,918
Gains on equipment transactions		2,124		1,023		397		319
Operating income		18,666		19,000		17,720		20,534
Net income (loss)		4,136		4,317		3,650		(6,227	)
Net income (loss) per common share—basic and diluted		0.09		0.10		0.08		(0.14	)
Weighted-average number of common shares—basic		44,649,645		44,717,372		44,767,163		44,844,469
Weighted-average number of common shares—diluted		44,917,014		44,988,655		45,118,607		44,844,469

(a)         See Note 5 for the impact of the increase in income tax expense during the three months ended December 31, 2017.

	Three months ended
	March 31, 2016		June 30, 2016		September 30, 2016		December 31, 2016
	(in thousands, except share and per share amounts)
Service revenue	$	108,291	$	109,955	$	113,057	$	115,596
Network operations, including equity-based compensation expense		47,277		47,872		48,827		50,089
Gains on equipment transactions		1,946		4,439		687		667
Operating income		15,675		17,511		16,063		14,795
Net income		3,354		4,224		3,459		3,892
Net income per common share—basic and diluted		0.08		0.09		0.08		0.09
Weighted-average number of common shares—basic		44,402,640		44,491,899		44,574,583		44,577,826
Weighted-average number of common shares—diluted		44,571,937		44,757,494		44,816,860		44,803,782