Earnings Per Share

12 Months Ended

Dec. 31, 2015

13. Earnings Per Share

Basic net 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 net income per share adjusts basic net income per share for the effects of potentially dilutive common shares, if the effect is not antidilutive. Potentially dilutive common stock consists of shares issuable under the 2010 Plan. The following is a summary of basic and diluted net income per share (in thousands, except share and per share amounts):

	Year Ended December 31,
	2015		2014		2013
Net income attributable to common shares	$	26,368	$	14,427	$	10,503
Weighted-average common shares outstanding—basic		25,218,500		21,161,614		20,826,622
Effect of potentially dilutive common shares:
Stock options		302,264		349,533		383,743
Unvested awards		185,804		229,560		292,847

Weighted-average common shares outstanding—diluted		25,706,568		21,740,707		21,503,212


Net income per share attributable to common shares
Basic	$	1.05	$	0.68	$	0.50
Diluted	$	1.03	$	0.66	$	0.49

In the calculations above, we have excluded weighted-average potentially dilutive securities of 117,048, 180,020 and 169,875 for the years ended December 31, 2015, 2014, and 2013, respectively, as their effect would have been antidilutive.