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Treasury Stock | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Treasury Stock | (6) Treasury Stock The Board of Directors previously authorized the Company’s repurchase of up to an aggregate of $800.0 million of its class A common stock from time to time on the open market through April 29, 2018 (the “2005 Share Repurchase Program”). In April 2018, the Board of Directors extended the term of the 2005 Share Repurchase Program through April 29, 2023, although the program may be suspended or discontinued by the Company at any time. The timing and amount of any shares repurchased will be determined by the Company’s management based on its evaluation of market conditions and other factors. The 2005 Share Repurchase Program may be funded using the Company’s working capital, as well as proceeds from any other funding arrangements that the Company may enter into in the future. During the three months ended March 31, 2018 and 2017, the Company did not repurchase any shares of its class A common stock pursuant to the 2005 Share Repurchase Program. As of March 31, 2018, the Company had repurchased an aggregate of 3,826,947 shares of its class A common stock at an average price per share of $90.23 and an aggregate cost of $345.3 million. The average price per share and aggregate cost amounts disclosed above include broker commissions.

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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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