STOCKHOLDERS' EQUITY (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Shares of Common Stock
Authorized (in shares)	400,000,000	400,000,000
Outstanding (in shares)	117,375,462	117,524,638	122,125,491
Par value per share (in dollars per share)	$ 0.01	$ 0.01
Share Issuance
Number of shares of common stock issued in connection with the exercise of stock options and vesting of RSUs	3,952,172	3,142,758
Cash proceeds received in connection with the exercise of stock options	$ 30	$ 75	$ 645
Number of shares of common stock issued as part of the purchase price		138,313