The following table presents information necessary to calculate basic and diluted earnings per share for the periods indicated:



	Year Ended December 31,
(in thousands, except per share amounts)	2017			2016			2015
Earnings per common share calculation – basic
Income from continuing operations attributable to common shareholders	$	196,422		$	436,981		$	229,565
Amount allocated to participating securities	(660		)	(6,304		)	(2,052		)
Income from continuing operations attributable to common shareholders, net of amount allocated to participating securities	$	195,762		$	430,677		$	227,513
Discontinued operations, including gain on sale, attributable to common shareholders	—			382,842			19,750
Net income attributable to common shareholders – basic	$	195,762		$	813,519		$	247,263

Earnings per common share from continuing operations	$	2.14		$	4.81		$	2.55
Earnings per common share from discontinued operations	—			4.27			0.22
Total earnings per common share – basic	$	2.14		$	9.08		$	2.77

Weighted average number of common shares outstanding – basic	91,499			89,580			89,120



Earnings per common share calculation – diluted
Income from continuing operations attributable to common shareholders, net of amount allocated to participating securities	$	195,762	$	430,677	$	227,513
Income allocated to common units from continuing operations	1,174		—		—
Income from continuing operations attributable to common shareholders, as adjusted	$	196,936	$	430,677	$	227,513
Discontinued operations, including gain on sale, attributable to common shareholders	—		382,842		19,750
Net income attributable to common shareholders – diluted	$	196,936	$	813,519	$	247,263

Earnings per common share from continuing operations	$	2.13	$	4.79	$	2.54
Earnings per common share from discontinued operations	—		4.26		0.22
Total earnings per common share – diluted	$	2.13	$	9.05	$	2.76

Weighted average number of common shares outstanding – basic	91,499		89,580		89,120
Incremental shares issuable from assumed conversion of:
Common share options and share awards granted	211		323		370
Common units	805		—		—
Weighted average number of common shares outstanding – diluted	92,515		89,903		89,490