Share-Based Compensation (Tables) |
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2018 | |||||||||||||||||||||||||||||||||||||||||||
| Share-based Compensation [Abstract] | |||||||||||||||||||||||||||||||||||||||||||
| Fair Value Assumptions for Performance Awards |
The fair values of the senior executives' performance share award grants with a TSR modifier for grants in 2018 and 2017 were $61.59 and $64.82, respectively, which were estimated using the Monte Carlo valuation model, and incorporated the following assumptions:
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- Definition Schedule of Share-based Payment Award, Equity Instruments Other than Options, Valuation Assumptions [Table Text Block] No definition available.
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- References No definition available.
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