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Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2019
Summary of RSUs Outstanding Under LTIP | A summary of the RSUs outstanding under the LTIP for the nine months ended September 30, 2019 is as follows:
|  | Restricted Share Units |
|  | Performance and Service Required (1) |  |  | Service Required |  |  | Total Restricted Share Units |  |  | Weighted-Average Grant-Date Fair Value |
Nonvested as of January 1, 2019 |  |  | 213,624 |  |  |  | 17,298 |  |  |  | 230,922 |  |  | $ | 76.20 |
Granted |  |  | 65,392 |  |  |  | 8,123 |  |  |  | 73,515 |  |  |  | 56.22 |
Vested |  |  | (75,921 | ) |  |  | (1,292 | ) |  |  | (77,213 | ) |  |  | 34.16 |
Forfeited |  |  | (6,753 | ) |  |  | (1,068 | ) |  |  | (7,821 | ) |  |  | 68.95 |
Nonvested as of September 30, 2019 |  |  | 196,342 |  |  |  | 23,061 |  |  |  | 219,403 |  |  | $ | 60.86 |
(1) | Nonvested, performance-based RSUs are reflected above at the maximum performance achievement level.
Long Term Incentive Plan [Member] |
Stock Option Activity in Company's Plan | Stock option activity under the Company’s LTIP for nine months ended September 30, 2019 was as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value (000's) |
Outstanding at January 1, 2019 |  |  | 30,750 |  |  | $ | 56.81 |  |  |  |  |  |  |  |  |
Granted |  |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Exercised |  |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Forfeited |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Outstanding (vested and expected to vest) at September 30, 2019 |  |  | 30,750 |  |  | $ | 56.81 |  |  |  | 6.2 |  |  | $ | 136 |
Exercisable at September 30, 2019 |  |  | 24,500 |  |  | $ | 56.33 |  |  |  | 5.4 |  |  | $ | 128 |
Stock Options [Member] |
Stock Option Activity in Company's Plan | Activity in the Company’s 1999 Stock Option Plan for the nine months ended September 30, 2019 was as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value (000's) |
Outstanding at January 1, 2019 |  |  | 750 |  |  | $ | 39.10 |  |  |  |  |  |  |  |  |
Granted |  |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Exercised |  |  | 750 |  |  | $ | 39.10 |  |  |  |  |  |  |  |  |
Forfeited |  |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Outstanding (exercisable and vested) at September 30, 2019 |  |  | 0 |  |  | $ | 0.00 |  |  |  | 0.0 |  |  | $ | 0 |

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