Common Stock	3 Months Ended
Mar. 31, 2014
Stockholders' Equity Note [Abstract]
Common Stock	Common Stock As of March 31, 2014 and December 31, 2013, 67,347,134 and 66,896,518 shares of our common stock were outstanding, respectively. During the three months ended March 31, 2014 and 2013, 379,616 and 139,799 shares of common stock, respectively, were issued primarily upon: (a) the exercise of stock options, (b) the satisfaction of required conditions under certain of our share-based compensation plans and (c) the purchase of common stock pursuant to our employee stock purchase plan. On September 26, 2011, our Board of Directors authorized the Company to repurchase up to $100.0 million of its outstanding common stock. Since the inception of the repurchase program through March 31, 2014, we have repurchased 2.8 million shares of our common stock for approximately $77.5 million, and there remains authorization for us to repurchase approximately $22.5 million of our shares under that authorization. On December 5, 2013, our Board of Directors authorized us to repurchase up to an additional $100.0 million of our outstanding common stock. As a result, $122.5 million was available for repurchase as of March 31, 2014. The repurchase programs do not obligate the Company to acquire any particular amount of common stock and may be suspended, recommenced or discontinued at any time or from time to time without prior notice. Acquisitions under our repurchase programs may be made from time to time to the extent permitted by securities laws and other legal requirements, including provisions in our credit agreement placing limitations on such repurchases. The repurchase programs have been and will be funded from our operations.

Common Stock

3 Months Ended

Mar. 31, 2014

Stockholders' Equity Note [Abstract]

As of March 31, 2014 and December 31, 2013, 67,347,134 and 66,896,518 shares of our common stock were outstanding, respectively.

During the three months ended March 31, 2014 and 2013, 379,616 and 139,799 shares of common stock, respectively, were issued primarily upon: (a) the exercise of stock options, (b) the satisfaction of required conditions under certain of our share-based compensation plans and (c) the purchase of common stock pursuant to our employee stock purchase plan.

On September 26, 2011, our Board of Directors authorized the Company to repurchase up to $100.0 million of its outstanding common stock. Since the inception of the repurchase program through March 31, 2014, we have repurchased 2.8 million shares of our common stock for approximately $77.5 million, and there remains authorization for us to repurchase approximately $22.5 million of our shares under that authorization. On December 5, 2013, our Board of Directors authorized us to repurchase up to an additional $100.0 million of our outstanding common stock. As a result, $122.5 million was available for repurchase as of March 31, 2014. The repurchase programs do not obligate the Company to acquire any particular amount of common stock and may be suspended, recommenced or discontinued at any time or from time to time without prior notice. Acquisitions under our repurchase programs may be made from time to time to the extent permitted by securities laws and other legal requirements, including provisions in our credit agreement placing limitations on such repurchases. The repurchase programs have been and will be funded from our operations.