Earnings Per Share

6 Months Ended

Jun. 30, 2017

10. 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):


	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Net income attributable to common shares	$	15,643	$	12,035	$	31,935	$	23,296
Weighted-average common shares outstanding - basic		33,835,727		32,022,845		33,698,022		31,137,769
Effect of potentially dilutive common shares:
Stock options		76,968		193,061		117,550		198,350
Unvested awards		141,121		219,700		194,358		218,038
Weighted-average common shares outstanding - diluted		34,053,816		32,435,606		34,009,930		31,554,157
Net income per share attributable to common shares
Basic	$	0.46	$	0.38	$	0.95	$	0.75
Diluted	$	0.46	$	0.37	$	0.94	$	0.74

In the calculations above, we have excluded weighted-average potentially dilutive securities of 562 and zero for the three months ended June 30, 2017, and 2016, respectively, and 92,260 and 118,940 for the six months ended June 30, 2017, and 2016, respectively, as their effect would have been antidilutive.