NET EARNINGS PER SHARE - Additional Information (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Earnings Per Share Disclosure [Line Items]
Net earnings per share, basic	$ 0.12	$ 0.29	$ 0.02	$ 0.18	$ 0.32	$ 3.52	$ 0.07	$ (0.10)	$ 0.62	$ 4.00	$ (2.58)
Net earnings per share, diluted	$ 0.12	$ 0.29	$ 0.02	$ 0.18	$ 0.32	$ 3.50	$ 0.07	$ (0.10)	$ 0.61	$ 3.99	$ (2.58)
Special dividend, payment date						Sep. 01, 2010
Special dividend paid						$ 5,600,000,000
Regular quarterly dividend						$ 11,000,000			$ 323,000,000	$ 608,000,000	$ 127,000,000
Special dividend, number of common shares issued						324,000			0	324,319	0