Earnings (Loss) per Share (Tables)

12 Months Ended

Dec. 31, 2012

Computation of Basic and Diluted Earnings (Loss) Per Share

The following table sets forth the computation of basic and diluted earnings (loss) per share (in thousands, except per share amounts):

	Year Ended December 31,
	2012			2011		2010
Numerators:
Amounts attributable to GSI Group Inc:
Income (loss) from continuing operations	$	22,434		$	21,648	$	(19,973	)
Income (loss) from discontinued operations.		(2,896	)		7,325		19,286
Net income (loss)	$	19,538		$	28,973	$	(687	)
Denominators:
Weighted average common shares outstanding—basic		33,775			33,481		23,703
Dilutive potential common shares(1)		161			108		—
Weighted average common shares outstanding—diluted		33,936			33,589		23,703
Antidilutive common shares excluded from above		244			132		183
Basic Earnings (Loss) per Common Share:
From continuing operations	$	0.66		$	0.65	$	(0.84	)
From discontinued operations	$	(0.08	)	$	0.22	$	0.81
Basic earnings (loss) per share attributable to GSI Group Inc.	$	0.58		$	0.87	$	(0.03	)
Diluted Earnings (Loss) per Common Share:
From continuing operations	$	0.66		$	0.64	$	(0.84	)
From discontinued operations	$	(0.08	)	$	0.22	$	0.81
Diluted earnings (loss) per share attributable to GSI Group Inc.	$	0.58		$	0.86	$	(0.03	)

(1) Due to the Company’s loss from continuing operations and net loss attributable to GSI Group Inc. for the year ended December 31, 2010, all potentially dilutive shares were excluded as their effect would have been anti-dilutive. The dilutive impact of 14 thousand shares for the year ended December 31, 2010 would not have an impact on earnings per common share from discontinued operations.