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Share Repurchase Program | 12 Months Ended
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Dec. 31, 2017
Proceeds from (Repurchase of) Equity [Abstract] |
Share repurchase program | NOTE 8 – SHARE REPURCHASE PROGRAM In January of 2011, the Company’s Board of Directors approved a share repurchase program. Under the program, the Company may, from time to time, repurchase shares of its common stock, solely through open market purchases effected through a broker dealer at prevailing market prices, based on a variety of factors such as price, corporate trading policy requirements and overall market conditions. The Company’s Board of Directors may increase or otherwise modify, renew, suspend or terminate the share repurchase program at any time, without prior notice. As announced on May 10, 2017, September 1, 2017, and February 7, 2018, the Company’s Board of Directors each time approved a resolution to increase the authorization amount under the share repurchase program by an additional $1.0 billion, resulting in a cumulative authorization amount of $10.8 billion. Each additional authorization is effective for a three-year period, beginning on its respective announcement date. The following table identifies shares of the Company’s common stock that have been repurchased as part of the Company’s publicly announced share repurchase program (in thousands, except per share data):
| For the Year Ended December 31,
| 2017 |  | 2016
Shares repurchased | 9,301 |  |  | 5,698 |
Average price per share | $ | 233.57 |  |  | $ | 264.21 |
Total investment | $ | 2,172,437 |  |  | $ | 1,505,371 |
As of December 31, 2017, the Company had $715.4 million remaining under its share repurchase program. Subsequent to the end of the year and through February 28, 2018, the Company repurchased an additional 1.1 million shares of its common stock under its share repurchase program, at an average price of $255.48, for a total investment of $289.9 million. The Company has repurchased a total of 67.4 million shares of its common stock under its share repurchase program since the inception of the program in January of 2011 and through February 28, 2018, at an average price of $138.38, for a total aggregate investment of $9.3 billion.

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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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