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)	2018			2017			2016
Earnings per common share calculation – basic
Income from continuing operations attributable to common shareholders	$	156,128		$	196,422		$	436,981
Amount allocated to participating securities	(1,107		)	(660		)	(6,304		)
Income from continuing operations attributable to common shareholders, net of amount allocated to participating securities	$	155,021		$	195,762		$	430,677
Discontinued operations, including gain on sale, attributable to common shareholders	—			—			382,842
Net income attributable to common shareholders – basic	$	155,021		$	195,762		$	813,519

Earnings per common share from continuing operations	$	1.63		$	2.14		$	4.81
Earnings per common share from discontinued operations	—			—			4.27
Total earnings per common share – basic	$	1.63		$	2.14		$	9.08

Weighted average number of common shares outstanding – basic	95,208			91,499			89,580



	Year Ended December 31,
(in thousands, except per share amounts)	2018		2017		2016
Earnings per common share calculation – diluted
Income from continuing operations attributable to common shareholders, net of amount allocated to participating securities	$	155,021	$	195,762	$	430,677
Income allocated to common units from continuing operations	—		1,174		—
Income from continuing operations attributable to common shareholders, as adjusted	$	155,021	$	196,936	$	430,677
Discontinued operations, including gain on sale, attributable to common shareholders	—		—		382,842
Net income attributable to common shareholders – diluted	$	155,021	$	196,936	$	813,519

Earnings per common share from continuing operations	$	1.63	$	2.13	$	4.79
Earnings per common share from discontinued operations	—		—		4.26
Total earnings per common share – diluted	$	1.63	$	2.13	$	9.05

Weighted average number of common shares outstanding – basic	95,208		91,499		89,580
Incremental shares issuable from assumed conversion of:
Common share options and share awards granted	158		211		323
Common units	—		805		—
Weighted average number of common shares outstanding – diluted	95,366		92,515		89,903