Earnings Per Share

Basic net income per share (“EPS”) is calculated by dividing net income attributable to common stockholders by the weighted average shares outstanding during the period. Diluted EPS is calculated by adjusting weighted average shares outstanding for the dilutive effect of potential common shares, determined using the treasury-stock method. For purposes of the diluted EPS calculation, stock options, restricted stock and restricted stock unit awards are considered to be potential common shares. Performance-based restricted stock units are not included in the calculation of diluted EPS until they are contingently issuable.

The basic and diluted EPS calculations for the three and six months ended June 30, 2017 and 2016 are presented below:



	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands, except per share amounts)	2017		2016		2017		2016
Income attributable to common stockholders	$	17,596	$	17,982	$	21,340	$	11,226

Weighted average common shares outstanding, basic	66,927		65,839		66,810		65,589
Effect of dilutive securities:
Restricted stock	61		229		72		258
Restricted stock units	210		117		194		66
Stock options	196		232		214		224
Weighted average common shares outstanding, diluted	67,394		66,417		67,290		66,137

Basic income per common share	$	0.26	$	0.27	$	0.32	$	0.17
Diluted income per common share	$	0.26	$	0.27	$	0.32	$	0.17

The following table provides the securities that could potentially dilute EPS in the future, but were not included in the computation of diluted EPS for the periods presented because to do so would have been anti-dilutive. The amounts included in this table exclude performance-based restricted stock units. As of June 30, 2017, the number of currently outstanding performance-based restricted stock units that are issued upon vesting could range from zero to a maximum of 456,054.



	Three Months Ended June 30,		Six Months Ended June 30,
(in thousands)	2017	2016	2017	2016
Restricted stock units	66	27	66	27
Stock options	1	577	1	577