Stockholders' Equity	6 Months Ended
Jun. 30, 2017
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity On February 4, 2016, the Company's Board of Directors approved a stock repurchase program (the "Program") under which the Company may purchase up to an aggregate of $500 million of its common stock over the following 18 month period. On July 27, 2017, the Company's Board of Directors authorized an increase in the size of the Program by an additional $250 million and an extension of the Program by an additional 18 months. With the increase and giving effect to the Company's $240 million of previous repurchases, the Company may repurchase up to $510 million in shares of its common stock at any time prior to February 1, 2019. Any stock repurchases may be made at times and in such amounts as deemed appropriate. The timing and amount of stock repurchases, if any, will depend on a variety of factors including the stock price, market conditions, corporate and regulatory requirements, and any additional constraints related to material inside information the Company may possess. Any repurchases have been and are expected to be funded by a combination of available cash flow from the business, working capital and debt. Since the beginning of the Program, 1,670,311 shares for an aggregate purchase price of $240.1 million have been repurchased. There were 411,166 shares totaling $52.4 million repurchased under the Program during the six months ended June 30, 2017. On August 3, 2017, as part of the Program, the Company entered an Accelerated Share Repurchase agreement ("ASR Agreement") with a third-party financial institution to repurchase $250 million of its common stock. Pursuant to the ASR Agreement, approximately 85% of the shares expected to be repurchased were received by the Company on August 8, 2017. The total number of shares ultimately repurchased under the Program will be determined upon final settlement and will be based on a discount to the volume-weighted average price of the Company's common stock during the ASR period. The Company anticipates that all repurchases under the ASR will be completed by the end of the third quarter of 2017.

Stockholders' Equity

On February 4, 2016, the Company's Board of Directors approved a stock repurchase program (the "Program") under which the Company may purchase up to an aggregate of $500 million of its common stock over the following 18 month period. On July 27, 2017, the Company's Board of Directors authorized an increase in the size of the Program by an additional $250 million and an extension of the Program by an additional 18 months. With the increase and giving effect to the Company's $240 million of previous repurchases, the Company may repurchase up to $510 million in shares of its common stock at any time prior to February 1, 2019. Any stock repurchases may be made at times and in such amounts as deemed appropriate. The timing and amount of stock repurchases, if any, will depend on a variety of factors including the stock price, market conditions, corporate and regulatory requirements, and any additional constraints related to material inside information the Company may possess. Any repurchases have been and are expected to be funded by a combination of available cash flow from the business, working capital and debt. Since the beginning of the Program, 1,670,311 shares for an aggregate purchase price of $240.1 million have been repurchased. There were 411,166 shares totaling $52.4 million repurchased under the Program during the six months ended June 30, 2017.

On August 3, 2017, as part of the Program, the Company entered an Accelerated Share Repurchase agreement ("ASR Agreement") with a third-party financial institution to repurchase $250 million of its common stock. Pursuant to the ASR Agreement, approximately 85% of the shares expected to be repurchased were received by the Company on August 8, 2017. The total number of shares ultimately repurchased under the Program will be determined upon final settlement and will be based on a discount to the volume-weighted average price of the Company's common stock during the ASR period. The Company anticipates that all repurchases under the ASR will be completed by the end of the third quarter of 2017.