TREASURY STOCK	6 Months Ended
Jun. 30, 2012
Equity [Abstract]
TREASURY STOCK	TREASURY STOCK In the first quarter of 2012, the Company's Board of Directors authorized a one-time purchase of the Company's common stock up to $200.0 million concurrent with the issuance of the 2018 Notes. The Company repurchased 263,913 shares in the first quarter of 2012 for an aggregate cost of $166.2 million. As of June 30, 2012, the Company has a remaining amount from all authorizations granted by the Board of Directors of $459.2 million to purchase its common stock. The Company may make additional repurchases of shares under its stock repurchase programs, depending on prevailing market conditions, alternate uses of capital and other factors. Whether and when to initiate and/or complete any purchase of common stock and the amount of common stock purchased will be determined in the Company’s complete discretion. The Company’s Board of Directors has also given the Company the general authorization to repurchase shares of its common stock to satisfy employee withholding tax obligations related to stock-based compensation. The Company repurchased 138,171 shares and 349,667 shares at aggregate costs of $89.0 million and $158.7 million in the six months ended June 30, 2012 and 2011, respectively, to satisfy employee withholding taxes related to stock-based compensation. As of June 30, 2012, there were approximately 8.2 million shares of the Company’s common stock held in treasury.

TREASURY STOCK

In the first quarter of 2012, the Company's Board of Directors authorized a one-time purchase of the Company's common stock up to $200.0 million concurrent with the issuance of the 2018 Notes. The Company repurchased 263,913 shares in the first quarter of 2012 for an aggregate cost of $166.2 million.

As of June 30, 2012, the Company has a remaining amount from all authorizations granted by the Board of Directors of $459.2 million to purchase its common stock. The Company may make additional repurchases of shares under its stock repurchase programs, depending on prevailing market conditions, alternate uses of capital and other factors. Whether and when to initiate and/or complete any purchase of common stock and the amount of common stock purchased will be determined in the Company’s complete discretion.

The Company’s Board of Directors has also given the Company the general authorization to repurchase shares of its common stock to satisfy employee withholding tax obligations related to stock-based compensation. The Company repurchased 138,171 shares and 349,667 shares at aggregate costs of $89.0 million and $158.7 million in the six months ended June 30, 2012 and 2011, respectively, to satisfy employee withholding taxes related to stock-based compensation.

As of June 30, 2012, there were approximately 8.2 million shares of the Company’s common stock held in treasury.