Common Stock	9 Months Ended
Sep. 30, 2016
Stockholders' Equity Note [Abstract]
Common Stock	Common Stock As of September 30, 2016 and December 31, 2015, there were 60,786,064 and 61,067,868 shares of our common stock outstanding, respectively. During the three months ended September 30, 2016 and 2015, 47,050 and 66,223 shares of common stock, respectively, were issued primarily upon: (a) the purchase of common stock pursuant to our employee stock purchase plan, (b) the exercise of stock options and (c) the satisfaction of required conditions under certain of our share-based compensation plans. During the nine months ended September 30, 2016 and 2015, 353,116 and 347,713 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 2016, we have repurchased approximately 0.6 million shares of our common stock for approximately $29.0 million. Since the inception of the repurchase programs through September 30, 2016, we have repurchased 10.5 million shares of our common stock for approximately $424.9 million. As of September 30, 2016, there remained authorization for us to repurchase approximately $225.1 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

9 Months Ended

Sep. 30, 2016

Stockholders' Equity Note [Abstract]

As of September 30, 2016 and December 31, 2015, there were 60,786,064 and 61,067,868 shares of our common stock outstanding, respectively.

During the three months ended September 30, 2016 and 2015, 47,050 and 66,223 shares of common stock, respectively, were issued primarily upon: (a) the purchase of common stock pursuant to our employee stock purchase plan, (b) the exercise of stock options and (c) the satisfaction of required conditions under certain of our share-based compensation plans. During the nine months ended September 30, 2016 and 2015, 353,116 and 347,713 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 2016, we have repurchased approximately 0.6 million shares of our common stock for approximately $29.0 million. Since the inception of the repurchase programs through September 30, 2016, we have repurchased 10.5 million shares of our common stock for approximately $424.9 million. As of September 30, 2016, there remained authorization for us to repurchase approximately $225.1 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.