Quarterly Financial Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information (unaudited)

Schedule of selected quarterly information

        The table below reflects the selected quarterly information for the years ended December 31, 2015, and 2014 (in thousands except share data):

	Three Months Ended
	December 31, 2015		September 30, 2015		June 30, 2015		March 31, 2015
Revenue	$	90,919	$	86,382	$	81,336	$	74,655
Operating income		19,321		16,751		14,676		13,336
Net income		17,387		14,530		12,882		12,060
Net income attributable to common shares		9,342		6,920		5,538		4,568
Net income per share attributable to common shares—basic	$	0.32	$	0.26	$	0.23	$	0.21
Net income per share attributable to common shares—diluted	$	0.32	$	0.26	$	0.22	$	0.21

	Three Months Ended
	December 31, 2014		September 30, 2014		June 30, 2014		March 31, 2014
Revenue	$	72,492	$	70,515	$	65,682	$	63,731
Operating income		12,477		10,372		12,029		9,309
Net income		12,306		8,990		10,638		8,118
Net income attributable to common shares		4,664		3,147		3,883		2,733
Net income per share attributable to common shares—basic	$	0.22	$	0.15	$	0.18	$	0.13
Net income per share attributable to common shares—diluted	$	0.21	$	0.14	$	0.18	$	0.13