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, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net earnings per share, basic	$ 0.26	$ 0.22	$ 0.16	$ 0.08	$ 0.12	$ 0.29	$ 0.02	$ 0.18		$ 0.71	$ 0.62	$ 4.00
As reported	$ 0.26	$ 0.22	$ 0.16	$ 0.08	$ 0.12	$ 0.29	$ 0.02	$ 0.18		$ 0.71	$ 0.61	$ 3.99
Special dividend, payment date									Sep. 01, 2010
Special dividend paid									$ 5,600,000,000
Regular quarterly dividend									$ 11,000,000	$ 334,000,000	$ 323,000,000	$ 608,000,000
Special dividend, number of common shares issued									324,000	0	0	324,319