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EARNINGS PER SHARE (Tables)

12 Months Ended

Dec. 31, 2012

EARNINGS PER SHARE

Schedule of components of the denominator for the calculation of basic net (loss) income per share and diluted net (loss) income per share

		Years Ended December 31,
		2012		2011		2010

Common shares outstanding, basic:
Weighted-average common shares outstanding, basic		41,727,075		35,179,244		32,987,449

Common shares outstanding, diluted:
Weighted-average common shares outstanding, basic		41,727,075		35,179,244		32,987,449

Dilutive effect of convertible notes		—		—		2,760,693

Dilutive effect of restricted stock awards		—		78,961		143,231

Weighted-average common shares outstanding, diluted		41,727,075		35,258,205		35,891,373

Schedule of reconciliation of the net (loss) income attributable to GS&T and the net (loss) income attributable to GS&T for diluted earnings per share

		Years Ended December 31,
		2012			2011			2010

Net (loss) income attributable to GS&T		$	(144,928	)	$	25,386		$	141,243

Interest expense related to convertible notes, if dilutive		—			—			4,657

Net (loss) income attributable to GS&T for the computation of diluted net (loss) income per share		$	(144,928	)	$	25,386		$	145,900