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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Restricted Stock Unit and Performance Share Transactions | A summary of restricted stock unit and performance share transactions for the year ended December 31, 2018, is shown below:
| Restricted Stock Units | Weighted Average Grant Date Fair Value | Performance Shares | Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2017 | 572,213 |  | $109.31 | 1,199,570 |  | $115.33
Granted | 141,439 |  | $168.86 | 274,026 |  | $179.40
Distributed (vested) | (162,144 | ) |  | (453,956 | ) |
Cancelled | (34,177 | ) |  | (98,934 | ) |
Outstanding as of December 31, 2018 (1) | 517,331 |  | $125.30 | 920,706 |  | $139.56
Vested or expected to vest as of December 31, 2018 | 517,331 |  |  | 651,244 |  |
(1) | Outstanding performance shares are reflected at the maximum possible payout that may be earned during the relevant performance periods.

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