STOCK REPURCHASE PROGRAM (Details) (USD $) In Thousands, except Share data	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Jun. 30, 2010	Jul. 19, 2011
STOCK REPURCHASE PROGRAM
Number of shares repurchased (in shares)	600,000	800,000
Aggregate amount of share repurchases (in dollars)	$ 31,200	$ 40,826	$ 32,962
Remaining authorization to repurchase additional shares (in shares)	861,000	861,000
Number of shares authorized to be repurchased (in shares)				4,000,000