SHAREHOLDERS' EQUITY (DETAILS)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Class of Stock [Line Items]
Total shares issued at end of period	170,159,000	154,912,000
Total treasury shares at end of period	(44,571,000)	(42,519,000)
Total shares outstanding	125,588,000	112,393,000
Common Shares [Member]
Class of Stock [Line Items]
Shares issued, balance at beginning of period	154,912,000	152,465,000	150,455,000
Shares issued	15,247,000	2,447,000	2,010,000
Total shares issued at end of period	170,159,000	154,912,000	152,465,000
Treasury shares, balance at beginning of period	(42,519,000)	(20,325,000)	(14,243,000)
Shares repurchased	(2,052,000)	(22,194,000)	(6,082,000)
Total treasury shares at end of period	(44,571,000)	(42,519,000)	(20,325,000)
Total shares outstanding	125,588,000	112,393,000	132,140,000