Common Stock	3 Months Ended
Mar. 31, 2017
Stockholders' Equity Note [Abstract]
Common Stock	Common Stock As of March 31, 2017 and December 31, 2016, there were 59,255,759 and 59,946,984 shares of our common stock outstanding, respectively. During the three months ended March 31, 2017 and 2016, 117,034 and 198,127 shares of common stock, respectively, were issued primarily upon: (a) the satisfaction of required conditions under certain of our share-based compensation plans, (b) the exercise of stock options and (c) the purchase of common stock pursuant to our employee stock purchase plan. On September 26, 2011, our Board of Directors authorized us to repurchase up to $100.0 million of our outstanding common stock. On December 5, 2013, October 23, 2014 and October 28, 2015, our Board of Directors authorized us to repurchase up to an additional $100.0 million, $250.0 million and $200.0 million of our outstanding common stock, respectively. During 2017, we have repurchased approximately 0.8 million shares of our common stock for approximately $53.3 million. Since the inception of the repurchase programs through March 31, 2017, we have repurchased 12.2 million shares of our common stock for approximately $537.7 million. As of March 31, 2017, there remained authorization for us to repurchase approximately $112.3 million of our shares. 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. We may repurchase our shares 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, 2017

Stockholders' Equity Note [Abstract]

As of March 31, 2017 and December 31, 2016, there were 59,255,759 and 59,946,984 shares of our common stock outstanding, respectively.

During the three months ended March 31, 2017 and 2016, 117,034 and 198,127 shares of common stock, respectively, were issued primarily upon: (a) the satisfaction of required conditions under certain of our share-based compensation plans, (b) the exercise of stock options and (c) the purchase of common stock pursuant to our employee stock purchase plan.

On September 26, 2011, our Board of Directors authorized us to repurchase up to $100.0 million of our outstanding common stock. On December 5, 2013, October 23, 2014 and October 28, 2015, our Board of Directors authorized us to repurchase up to an additional $100.0 million, $250.0 million and $200.0 million of our outstanding common stock, respectively. During 2017, we have repurchased approximately 0.8 million shares of our common stock for approximately $53.3 million. Since the inception of the repurchase programs through March 31, 2017, we have repurchased 12.2 million shares of our common stock for approximately $537.7 million. As of March 31, 2017, there remained authorization for us to repurchase approximately $112.3 million of our shares. 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. We may repurchase our shares 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.