STOCK REPURCHASE PROGRAM (Details) (USD $) In Thousands, except Share data	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Sep. 30, 2010	Jul. 19, 2011
STOCK REPURCHASE PROGRAM
Number of shares authorized to be repurchased				4,000,000
Number of shares repurchased	800,000	1,600,000
Aggregate amount of share repurchases (in dollars)	$ 38,800	$ 79,640	$ 58,785
Remaining authorization to repurchase additional shares (in shares)	4,100,000	4,100,000