EARNINGS PER SHARE (Tables)

12 Months Ended

Dec. 31, 2011

EARNINGS PER SHARE

Schedule of calculation of earnings per share

	2011		2010			2009
Net income (loss)	$	159,559	$	(208,193	)	$	176,455
Basic weighted-average number of common shares outstanding (000s)		304,655		195,808			158,236
Dilutive effect of stock options and RSUs (000s)		8,484		—			274
Dilutive effect of convertible debt (000s)		12,980		—			—
Diluted weighted-average number of common shares outstanding (000s)		326,119		195,808			158,510
Basic earnings (loss) per share	$	0.52	$	(1.06	)	$	1.11
Diluted earnings (loss) per share	$	0.49	$	(1.06	)	$	1.11

Schedule of dilutive effect of stock options, RSUs and Convertible Notes on weighted-average number of common shares outstanding

	2010
Basic weighted-average number of common shares outstanding (000s)		195,808
Dilutive effect of stock options and RSUs (000s)		2,774
Dilutive effect of Convertible Notes (000s)		6,947
Diluted weighted-average number of common shares outstanding (000s)		205,529