he following table sets forth the components of the numerator and denominator for the computation of the basic and diluted earnings per share:



	Year Ended December 31,
	2017			2016			2015
	(amounts in thousands, except per share data)
Numerator:
Net income attributable to common shareholders - Basic	$	37,513		$	7,967		$	4,418
Interest on Convertible Notes	694			3,383			*
Gain on derivative liability	(1,581		)	(5,805		)	*
Net income attributable to common shareholders - Diluted	$	36,626		$	5,545		$	4,418

Denominator:
Weighted average common shares - Basic	35,018			32,132			31,514
Effective of diluted shares:
Share-based awards	425			593			648
Convertible Notes	723			3,521			—
Weighted average common shares - Diluted	36,166			36,246			32,162

Net income per share attributable to common shareholders - Basic	$	1.07		$	0.25		$	0.14

Net income per share attributable to common shareholders - Diluted	$	1.01		$	0.15		$	0.14

* For the year 2015, the Convertible Notes would have been anti-dilutive if converted at the beginning of the period and therefore, amounts are not applicable.

For the years 2017, 2016, and 2015, no tax benefits were assumed in the weighted average share calculation due to the Company's net operating loss position.

The following table represents the securities that could potentially dilute net income per share attributable to common shareholders in the future that were not included in the computation of diluted net income per share attributable to common shareholders because to do so would have been anti-dilutive for the periods presented.



	Year Ended December 31,
	2017	2016	2015
	(amounts in thousands)
Convertible notes and share-based awards	118	—	3,521