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Stock Incentive Plans and Stock Purchase Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Restricted Stock and Deferred Stock Awards | The activity related to the Company’s restricted stock and deferred stock awards and the corresponding weighted average grant-date fair values for the year ended December 31, 2018 are as follows:
|  | Number of Shares |  |  | Weighted Average Fair Value |
Non-vested shares at January 1, 2018 |  |  | 1,041,034 |  |  | $ | 60.21 |
Awarded |  |  | 770,480 |  |  | $ | 51.99 |
Forfeited |  |  | (69,293 | ) |  | $ | 56.65 |
Vested |  |  | (431,368 | ) |  | $ | 63.57 |
Non-vested shares at December 31, 2018 |  |  | 1,310,853 |  |  | $ | 54.46 |
Schedule of Activity and Certain Other Information Related to Stock Option Awards | The activity and certain other information related to the Company’s outstanding stock option awards for the year ended December 31, 2018 are as follows:
|  | Number of Stock Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in millions) |
Outstanding at January 1, 2018 |  |  | 246,342 |  |  | $ | 27.51 |  |  |  |  |  |  |  |  |
Exercised |  |  | (133,366 | ) |  | $ | 27.38 |  |  |  |  |  |  | $ | 2.8 |
Outstanding and exercisable at December 31, 2018 |  |  | 112,976 |  |  | $ | 27.65 |  |  |  | 1.3 |  |  | $ | 0.7 |

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