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Stock Repurchases | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Stock Repurchases | Stock Repurchases: Our Board of Directors has authorized a total of $2 billion towards the repurchase of shares of our common stock (collectively referred to as the "Share Repurchase Plans"), including a $550 million share repurchase authorization in 2016. The Share Repurchase Plans authorize open market repurchase transactions and do not have a stated expiration date. As of December 31, 2017, $396.0 million of shares may still be repurchased under the Share Repurchase Plans. On February 9, 2017, the Company entered into a Fixed Dollar Accelerated Share Repurchase Transaction (the “ASR Agreement”) with Morgan Stanley, to effect an accelerated stock buyback of our common stock. Under the ASR Agreement, on February 9, 2017, we paid Morgan Stanley an initial purchase price of $75 million, and Morgan Stanley delivered to us common stock, representing approximately 85% of the shares expected to be purchased under the ASR Agreement. The ASR Agreement was completed in the second quarter and Morgan Stanley delivered additional shares for a total of 0.5 million shares of common stock repurchased as part of this ASR Agreement. On April 28, 2017, we entered into another Fixed Dollar ASR Agreement (the "Second ASR Agreement") with J.P. Morgan Chase Bank to effect an accelerated stock buyback of common stock. Under the Second ASR Agreement, on April 28, 2017, we paid J.P. Morgan Chase Bank an initial purchase price of $100 million, and J.P. Morgan Chase Bank delivered to us common stock, representing approximately 85% of the shares expected to be purchased under the ASR Agreement. The ASR Agreement was completed in the third quarter and J.P. Morgan Chase Bank delivered additional shares for a total of 0.6 million shares of common stock repurchased as part of this ASR Agreement. On July 27, 2017, we entered into another Fixed Dollar ASR Agreement (the "Third ASR Agreement") with Bank of America to effect an accelerated stock buyback of common stock. Under the Third ASR Agreement, on July 27, 2017, we paid Bank of America an initial purchase price of $75 million, and Bank of America delivered to us common stock, representing approximately 85% of the shares expected to be purchased under the third ASR Agreement. The ASR Agreement was completed in the fourth quarter and Bank of America delivered additional shares for a total of 0.4 million shares of common stock repurchased as part of this ASR Agreement. We also repurchased 0.1 million shares for $26.1 million and 0.2 million shares for $33.3 million for the years ended December 31, 2017 and 2016, respectively, from employees who surrendered their shares to satisfy minimum tax withholding obligations upon the vesting of stock-based compensation awards.

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- Definition The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2208821 + Details
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