TREASURY STOCK	12 Months Ended
Dec. 31, 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 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. In the first quarter of 2010, the Company’s Board of Directors authorized an additional repurchase of up to $500 million of the Company’s common stock from time to time in the open market or in privately negotiated transactions, including the approval to purchase up to $100 million from the proceeds from the issuance of the 2015 Notes. During the year ended December 31, 2010, the Company repurchased 461,437 shares of its common stock at an aggregate cost of approximately $106.1 million. The 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. In the years ended December 31, 2012, 2011 and 2010, the Company repurchased 141,229, 358,517, and 94,572 shares at an aggregate cost of approximately $90.8 million, $163.2 million and $23.4 million, respectively, to satisfy employee withholding taxes related to stock-based compensation. The Company may make additional repurchases of shares under its stock repurchase program, 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 has a remaining authorization of $459.2 million to repurchase common stock. As of December 31, 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 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.

In the first quarter of 2010, the Company’s Board of Directors authorized an additional repurchase of up to $500 million of the Company’s common stock from time to time in the open market or in privately negotiated transactions, including the approval to purchase up to $100 million from the proceeds from the issuance of the 2015 Notes. During the year ended December 31, 2010, the Company repurchased 461,437 shares of its common stock at an aggregate cost of approximately $106.1 million.

The 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. In the years ended December 31, 2012, 2011 and 2010, the Company repurchased 141,229, 358,517, and 94,572 shares at an aggregate cost of approximately $90.8 million, $163.2 million and $23.4 million, respectively, to satisfy employee withholding taxes related to stock-based compensation.

The Company may make additional repurchases of shares under its stock repurchase program, 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 has a remaining authorization of $459.2 million to repurchase common stock. As of December 31, 2012, there were approximately 8.2 million shares of the Company’s common stock held in treasury.