EARNINGS PER SHARE (Details 2)	12 Months Ended							12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 5.375% Convertible Notes due in August, 2014	Dec. 31, 2010 5.375% Convertible Notes due in August, 2014	Dec. 31, 2009 5.375% Convertible Notes due in August, 2014	Jun. 10, 2009 5.375% Convertible Notes due in August, 2014	Dec. 31, 2010 Dilutive effect of stock options and RSUs	Dec. 31, 2010 Dilutive effect of Convertible Notes	Dec. 31, 2011 Dilutive effect of stock options	Dec. 31, 2010 Dilutive effect of stock options	Dec. 31, 2009 Dilutive effect of stock options
Anti-dilutive shares not included in the computation of diluted earnings per share
Anti-dilutive stock options not included in the computation of diluted earnings per share (in shares)								2,774,000	6,947,000	271,000	1,465,000	2,950,000
Interest rate on debt (as a percent)				5.375%	5.375%	5.375%	5.375%
Basic weighted-average number of common shares outstanding (000s) (in shares)	304,655,000	195,808,000	158,236,000
Potential diluted weighted-average number of common shares outstanding (000s) (in shares)		205,529,000