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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary of Stock Based Compensation Activity Related to Nonvested RSUs | The following table summarizes activity related to nonvested RSUs:
|  | Number of RSUs (In thousands) |  | Weighted Average Grant-Date Fair Value Per Share
Nonvested at December 31, 2016 |  | 788 |  |  |  | $ | 183.00 |  |
Granted |  | 519 |  |  |  | 254.58 |  |
Vested |  | (624 | ) |  |  | 201.65 |  |
Forfeited |  | (32 | ) |  |  | 223.23 |  |
Nonvested at December 31, 2017 |  | 651 |  |  |  | $ | 220.21 |  |
Granted |  | 406 |  |  |  | 353.99 |  |
Vested |  | (470 | ) |  |  | 271.50 |  |
Forfeited |  | (24 | ) |  |  | 282.07 |  |
Nonvested at December 31, 2018 |  | 563 |  |  |  | $ | 271.23 |  |
Granted |  | 581 |  |  |  | 305.30 |  |
Vested |  | (523 | ) |  |  | 269.00 |  |
Forfeited |  | (21 | ) |  |  | 302.78 |  |
Nonvested at December 31, 2019 |  | 600 |  |  |  | $ | 305.06 |  |

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- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
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