Earnings Per Share

6 Months Ended

Jun. 30, 2015

10. Earnings Per Share

Basic income per share is calculated by dividing the net income attributable to common shares by the weighted-average number of common shares outstanding during the period. Diluted income per share adjusts basic income per share for the effects of potentially dilutive common shares, if the effect is not antidilutive. Potentially dilutive common stock consist of shares issuable under the 2010 Plan. The following is a summary of basic and diluted income per share (in thousands, except share and per share amounts):

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Net income attributable to common shares	$	5,538	$	3,883	$	10,106	$	6,616
Weighted-average common shares outstanding - basic	24,536,583		21,131,077		22,963,111		21,062,299
Effect of potentially dilutive common shares:
Stock options	363,760		371,536		373,438		368,516
Unvested awards	154,852		102,117		188,767		168,934

Weighted-average common shares outstanding - diluted	25,055,195		21,604,730		23,525,316		21,599,749

Net income per share attributable to common shares
Basic	$	0.23	$	0.18	$	0.44	$	0.31
Diluted	$	0.22	$	0.18	$	0.43	$	0.31

In the calculations above, we have excluded weighted-average potentially dilutive securities of 43,013 and 165,552 for the three months ended June 30, 2015, and 2014, respectively, and 141,081 and 202,422 for the six months ended June 30, 2015, and 2014, respectively, as their effect would have been antidilutive.