Quarterly financial data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly financial data (unaudited)

Schedule of quarterly financial data

	2012
	March 31		June 30		September 30		December 31
Revenue	$	24,187	$	24,302	$	26,017	$	28,000
Income from operations	$	2,407	$	2,236	$	4,129	$	2,074
Net income attributable to common stockholders	$	1,657	$	1,461	$	2,777	$	1,400
Basic earnings per share	$	0.05	$	0.04	$	0.08	$	0.04
Diluted earnings per share	$	0.05	$	0.04	$	0.07	$	0.04

	2011
	March 31			June 30		September 30		December 31
Revenue	$	21,028		$	22,943	$	24,688	$	25,899
Income from operations	$	1,729		$	2,427	$	2,981	$	4,040
Net (loss) income attributable to common stockholders	$	(148	)	$	1,293	$	1,662	$	1,855
Basic (loss) earnings per share	$	(0.03	)	$	0.06	$	0.05	$	0.06
Diluted (loss) earnings per share	$	(0.03	)	$	0.05	$	0.05	$	0.05