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Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Share Repurchases of Common Stock | The Company made the following share repurchases during the years indicated:
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Aggregate purchase price |  | $ | 422,166 |  |  | $ | 455,351 |  |  | $ | 431,367 |
Number of shares repurchased |  | 167 |  |  | 280 |  |  | 290 |

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- References No definition available. + Details
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