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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Schedule of Stock Repurchased and Retired | Share repurchases under this authorization were as follows:
|  | Repurchases Occurring in the Six Months Ended June 30, 2018 |  | Cumulative Repurchases as of June 30, 2018
|  | Shares |  | Average Price |  | Shares |  | Average Price
2016 Share Repurchase Authorization |  | 640,586 |  |  | $ | 99.89 |  |  | 1,683,311 |  |  | $ | 89.96 |

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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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