Earnings Per Share

12 Months Ended

Dec. 31, 2016

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,
	2016		2015		2014
Net income attributable to common shares	$	50,371	$	26,368	$	14,427
Weighted-average common shares outstanding - basic		32,289,414		25,218,500		21,161,614
Effect of potentially dilutive common shares:
Stock options		192,464		302,264		349,533
Unvested awards		250,181		185,804		229,560
Weighted-average common shares outstanding - diluted		32,732,059		25,706,568		21,740,707
Net income per share attributable to common shares
Basic	$	1.56	$	1.05		$ 0.68
Diluted	$	1.54	$	1.03		$ 0.66

In the calculations above, we have excluded weighted-average potentially dilutive securities of 29,618, 117,048 and 180,020 for the years ended December 31, 2016, 2015, and 2014, respectively, as their effect would have been antidilutive.