6.Earnings (Loss) Per Share

We compute earnings (loss) per share using the two-class method. The two-class method requires an earnings allocation formula that determines earnings per share for common shareholders and participating security holders according to dividends declared and participating rights in undistributed earnings. We consider time-based restricted stock awards to be participating securities because holders of such shares have non-forfeitable dividend rights. Under the two-class method, undistributed earnings allocated to participating securities are subtracted from net (loss) income attributable to the Company in determining net (loss) income attributable to common shareholders.

The calculations of basic and diluted (loss) earnings per common share are as follows (in thousands, except per-share data):


	Three Months Ended				Nine Months Ended
	September 30,		September 24,		September 30,		September 24,
	2018		2017		2018		2017

Basic (loss) earnings per common share:
Net (loss) income attributable to the Company	$	(13,033)	$	21,817	$	15,495	$	73,783
Change in noncontrolling interest redemption value		—		237		—		1,419
Net income attributable to participating securities		—		(89)		(147)		(305)
Net (loss) income attributable to common shareholders	$	(13,033)	$	21,965	$	15,348	$	74,897

Weighted average common shares outstanding		31,573		36,146		32,265		36,563
Basic (loss) earnings per common share	$	(0.41)	$	0.61	$	0.48	$	2.05

Diluted (loss) earnings per common share:
Net (loss) income attributable to common shareholders	$	(13,033)	$	21,965	$	15,348	$	74,897

Weighted average common shares outstanding		31,573		36,146		32,265		36,563
Dilutive effect of outstanding equity awards (a)		—		435		224		484
Diluted weighted average common shares outstanding		31,573		36,581		32,489		37,047
Diluted (loss) earnings per common share	$	(0.41)	$	0.60	$	0.47	$	2.02

(a) Excludes 1,209 options for the nine months ended September 30, 2018, and 328 and 261 options for the three and nine months ended September 24, 2017, respectively, as the effect of including such awards would have been antidilutive.