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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | A summary of stock option activity is as follows:
Options | Number of Shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2021 | 9,272 |  |  | $ | 82.47 |
Exercised | — |  |  | — |
Outstanding at December 31, 2022 | 9,272 |  |  | $ | 82.47 |
Exercised | — |  |  | — |
Outstanding at December 31, 2023 | 9,272 |  |  | $ | 82.47 |
Exercised | (9,272) |  |  | 82.47 |
Outstanding at December 31, 2024 | — |  |  | $ | — |
Summary of Company's Employee and Director Share Grant Activity | A summary of the Company’s employee and director stock grant activity is as follows:
Restricted Stock Grants | Shares |  | Weighted-Average Grant-Date Fair Value
Unreleased at December 31, 2021 | 199,778 |  |  | $ | 115.16 |
Granted | 105,677 |  |  | 201.12 |
Released | (86,781) |  |  | 112.31 |
Canceled | (10,614) |  |  | 147.03 |
Unreleased at December 31, 2022 | 208,060 |  |  | $ | 158.38 |
Granted | 98,263 |  |  | 158.04 |
Released | (90,662) |  |  | 147.21 |
Canceled | (10,084) |  |  | 165.36 |
Unreleased at December 31, 2023 | 205,577 |  |  | $ | 162.81 |
Granted | 142,324 |  |  | 147.87 |
Released | (93,453) |  |  | 153.78 |
Canceled | (6,365) |  |  | 155.37 |
Unreleased at December 31, 2024 | 248,083 |  |  | $ | 157.84 |
Schedule of Nonvested Performance-based Units Activity | A summary of the PSU activity is as follows:
Performance-Based Stock Units |  | Units |  | Weighted-Average Grant-Date Fair Value
Unvested at December 31, 2021 |  | 135,408 |  |  | $ | 111.69 |
Granted |  | 61,085 |  |  | 223.96 |
Released |  | (49,334) |  |  | $ | 194.21 |
Unvested at December 31, 2022 |  | 147,159 |  |  | $ | 130.63 |
Granted |  | 86,795 |  |  | 207.28 |
Released |  | (45,242) |  |  | $ | 162.18 |
Unvested at December 31, 2023 |  | 188,712 |  |  | $ | 158.32 |
Granted |  | 115,283 |  |  | 161.82 |
Released |  | (40,832) |  |  | $ | 143.36 |
Unvested at December 31, 2024 |  | 263,163 |  |  | $ | 162.17 |
Schedule of Weighted Average Assumptions Used to Estimate Fair Value of Awards | A Monte Carlo simulation model was used to calculate the fair value of the TSR Target portion of the PSUs, using the following assumptions:
|  | For the Year Ended December 31,
|  | 2024 |  | 2023 |  | 2022
Intrinsic value |  | $39,369 |  | $30,256 |  | $21,659
Risk-free rate |  | 5.5% |  | 4.6% |  | 1.8%
Volatility |  | 29.9% |  | 29.3% |  | 29.3%
Expected term (in years) |  | 2.8 |  | 2.8 |  | 2.9
Dividend yield |  | —% |  | —% |  | —%
Unrecognized compensation cost |  | $19,642 |  | $18,798 |  | $13,241
Term over which compensation cost recognized (in years) |  | 3 |  | 3 |  | 3

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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