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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Summary of RSUs Under the Long-Term Incentive Plans | A summary of the Company’s RSUs under the Company’s long-term incentive plans as of December 31, 2020, and changes during the year then ended is presented as follows:
| Shares |  | Weighted average grant date fair value |  | Weighted average remaining contractual term (years) |  | Aggregate intrinsic value
Restricted Stock Units outstanding, December 31, 2019 | 362 |  |  | $ | 158.13 |  |  |  |  |
Granted | 192 |  |  | 120.36 |  |  |  |  |
Released | (146) |  |  | 203.05 |  |  |  |  |
Forfeited | (33) |  |  | 140.69 |  |  |  |  |
Restricted Stock Units outstanding, December 31, 2020 | 375 |  |  | $ | 122.84 |  |  | 1.4 |  | $ | 52,822 |
Expected to vest as of December 31, 2020 | 361 |  |  |  |  | 1.4 |  | $ | 50,895 |
Additional Information for RSUs Under the Long-Term Incentive Plans | Additional information relating to the Company’s RSUs under the Company’s long-term incentive plans are as follows:
| 2020 |  | 2019 |  | 2018
Restricted Stock Units outstanding, January 1 | 362 |  |  | 446 |  |  | 555 |
Granted | 192 |  |  | 187 |  |  | 136 |
Released | (146) |  |  | (230) |  |  | (235) |
Forfeited | (33) |  |  | (41) |  |  | (10) |
Restricted Stock Units outstanding, December 31 | 375 |  |  | 362 |  |  | 446 |
Expected to vest as of December 31 | 361 |  |  | 356 |  |  | 440 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
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- References No definition available. + Details
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