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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Restricted Stock Unit and Performance Share Transactions | A summary of restricted stock units, performance shares and stock options for the year ended December 31, 2020, is shown below:
| Restricted Stock Units | Weighted Average Grant Date Fair Value | Performance Shares | Weighted Average Grant Date Fair Value | Stock Options | Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2019 | 705,136 |  | $128.71 | 849,544 |  | $140.83 | — |  |
Granted | 168,811 |  | $129.40 | 346,317 |  | $147.53 | 108,446 |  | $30.32
Distributed (vested) | (220,122) |  |  | (129,920) |  |  | — |  |
Cancelled | (37,241) |  |  | (256,470) |  |  | — |  |
Outstanding as of December 31, 2020 (1) | 616,584 |  | $124.83 | 809,471 |  | $143.48 | 108,446 |  | $30.32
Vested or expected to vest as of December 31, 2020 | 616,584 |  |  | 299,390 |  |  | 108,446 |  |
(1)Outstanding performance shares are reflected at the maximum possible payout that may be earned during the relevant performance periods.

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