Basic and diluted earnings per common share gives effect, utilizing the two-class method, to the potential dilution from the issuance of shares of our common stock in settlement of RSUs which provide for non-forfeitable dividend equivalents equal to the dividends declared per common share. Basic and diluted earnings per common share is computed by dividing net earnings less dividend equivalents attributable to RSUs by the weighted average number of common shares outstanding during the period.

Diluted earnings per common share, also gives effect to the potential dilution from the exercise of stock options utilizing the treasury stock method. There were no options outstanding as of September 30, 2018 and 2017.

The following table is a reconciliation of the numerator and denominator used in the computation of basic and diluted earnings per common share using the two-class method (in thousands except per share data):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Earnings from continuing operations	$	11,017		$	9,458		$	35,002		$	31,728
Less earnings attributable to RSUs outstanding		(183	)		(126	)		(548	)		(391	)
Earnings from continuing operations		10,834			9,332			34,454			31,337
Earnings (loss) from discontinued operations		(73	)		(118	)		(486	)		2,422
Less earnings attributable to RSUs outstanding		—			—			—			(30	)
Earnings (loss) from discontinued operations		(73	)		(118	)		(486	)		2,392
Net earnings attributable to common stockholders used in basic and diluted earnings per share calculation	$	10,761		$	9,214		$	33,968		$	33,729
Weighted average common shares outstanding:
Basic		40,430			38,702			40,016			35,979
Incremental shares from stock-based compensation		25			—			15			—
Diluted		40,455			38,702			40,031			35,979
Basic earnings per common share	$	0.27		$	0.24		$	0.85		$	0.94
Diluted earnings per common share	$	0.27		$	0.24		$	0.85		$	0.94