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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Schedule of Stock Repurchased and Retired | Share repurchases under this authorization were as follows:
|  | Repurchases Occurring in the Nine Months Ended September 30, 2018 |  | Cumulative Repurchases as of September 30, 2018
|  | Shares |  | Average Price |  | Shares |  | Average Price
2016 Share Repurchase Authorization |  | 1,199,257 |  |  | $ | 93.11 |  |  | 2,241,982 |  |  | $ | 88.81 |

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- Definition Tabular disclosure of stock repurchased and retired during the period. + References No definition available. + Details
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- References No definition available. + Details
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