STOCK REPURCHASE PROGRAM (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Jul. 18, 2013
STOCK REPURCHASE PROGRAM
Number of shares repurchased	600,000	801,000
Aggregate amount of share repurchases (in dollars)	$ 33,800	$ 44,588	$ 10,096
Remaining authorization to repurchase additional shares	1,200,000	1,200,000
Number of shares authorized to be repurchased				4,000,000