Treasury Stock	6 Months Ended
Jun. 30, 2013
Equity [Abstract]
Treasury Stock	13. TREASURY STOCK Stock Repurchase Programs The Company’s Board of Directors authorized an ongoing stock repurchase program with a total repurchase authority granted to the Company of $3.4 billion. The Company may use the approved dollar authority to repurchase stock at any time until the approved amount is exhausted. The objective of the Company’s stock repurchase program is to improve stockholders’ returns. At June 30, 2013, approximately $234.6 million was available to repurchase common stock pursuant to the stock repurchase program. All shares repurchased are recorded as treasury stock. A portion of the funds used to repurchase stock over the course of the program was provided by proceeds from employee stock option exercises and the related tax benefit. The Company is authorized to make open market purchases of its common stock using general corporate funds through open market purchases or pursuant to a Rule 10b5-1 plan. During the three months ended June 30, 2013, the Company expended approximately $39.7 million on open market purchases, repurchasing 614,750 shares of outstanding common stock at an average price of $64.53. During the six months ended June 30, 2013, the Company expended approximately $101.0 million on open market purchases, repurchasing 1,475,250 shares of outstanding common stock at an average price of $68.49. During the three months ended June 30, 2012, the Company did not make any open market purchases of its stock and during the six months ended June 30, 2012, the Company expended approximately $100.0 million on open market purchases, repurchasing 1,378,600 shares of outstanding common stock at an average price of $72.53. Shares for Tax Withholding During the three months ended June 30, 2013, the Company withheld 23,796 shares from stock units that vested, totaling $1.6 million, to satisfy minimum tax withholding obligations that arose on the vesting of stock units. During the six months ended June 30, 2013, the Company withheld 346,334 shares from stock units that vested, totaling $24.8 million, to satisfy minimum tax withholding obligations that arose on the vesting of stock units. These shares are reflected as treasury stock in the Company’s condensed consolidated balance sheets and the related cash outlays do not reduce the Company’s total stock repurchase authority. During the three months ended June 30, 2012, the Company withheld 12,821 shares from stock units that vested, totaling $1.0 million, to satisfy minimum tax withholding obligations that arose on the vesting of stock units. During the six months ended June 30, 2012, the Company withheld 195,871 shares from stock units that vested, totaling $15.1 million, to satisfy minimum tax withholding obligations that arose on the vesting of stock units. These shares are reflected as treasury stock in the Company’s condensed consolidated balance sheets and the related cash outlays do not reduce the Company’s total stock repurchase authority.

13. TREASURY STOCK

Stock Repurchase Programs

The Company’s Board of Directors authorized an ongoing stock repurchase program with a total repurchase authority granted to the Company of $3.4 billion. The Company may use the approved dollar authority to repurchase stock at any time until the approved amount is exhausted. The objective of the Company’s stock repurchase program is to improve stockholders’ returns. At June 30, 2013, approximately $234.6 million was available to repurchase common stock pursuant to the stock repurchase program. All shares repurchased are recorded as treasury stock. A portion of the funds used to repurchase stock over the course of the program was provided by proceeds from employee stock option exercises and the related tax benefit.

The Company is authorized to make open market purchases of its common stock using general corporate funds through open market purchases or pursuant to a Rule 10b5-1 plan.

During the three months ended June 30, 2013, the Company expended approximately $39.7 million on open market purchases, repurchasing 614,750 shares of outstanding common stock at an average price of $64.53. During the six months ended June 30, 2013, the Company expended approximately $101.0 million on open market purchases, repurchasing 1,475,250 shares of outstanding common stock at an average price of $68.49.

During the three months ended June 30, 2012, the Company did not make any open market purchases of its stock and during the six months ended June 30, 2012, the Company expended approximately $100.0 million on open market purchases, repurchasing 1,378,600 shares of outstanding common stock at an average price of $72.53.

Shares for Tax Withholding

During the three months ended June 30, 2013, the Company withheld 23,796 shares from stock units that vested, totaling $1.6 million, to satisfy minimum tax withholding obligations that arose on the vesting of stock units. During the six months ended June 30, 2013, the Company withheld 346,334 shares from stock units that vested, totaling $24.8 million, to satisfy minimum tax withholding obligations that arose on the vesting of stock units. These shares are reflected as treasury stock in the Company’s condensed consolidated balance sheets and the related cash outlays do not reduce the Company’s total stock repurchase authority.

During the three months ended June 30, 2012, the Company withheld 12,821 shares from stock units that vested, totaling $1.0 million, to satisfy minimum tax withholding obligations that arose on the vesting of stock units. During the six months ended June 30, 2012, the Company withheld 195,871 shares from stock units that vested, totaling $15.1 million, to satisfy minimum tax withholding obligations that arose on the vesting of stock units. These shares are reflected as treasury stock in the Company’s condensed consolidated balance sheets and the related cash outlays do not reduce the Company’s total stock repurchase authority.