STOCK REPURCHASE PROGRAM (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Jul. 18, 2013
STOCK REPURCHASE PROGRAM
Number of shares repurchased	600,000	1,400,000
Aggregate amount of share repurchases (in dollars)	$ 35,600	$ 80,222	$ 40,896
Number of shares authorized to be repurchased				4,000,000
Remaining authorization to repurchase additional shares	4,600,000	4,600,000