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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Summary of Restricted Stock Award Activity for Employees and Non-Employee Directors | The following table summarizes our restricted stock award activity for employees and non-employee directors:
|  | Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Unvested at January 1, 2023 |  |  | 77,725 |  |  | $ | 232.79 |
Granted |  |  | 37,730 |  |  |  | 359.53 |
Vested |  |  | (52,447 | ) |  |  | 222.91 |
Forfeited |  |  | (5,026 | ) |  |  | 322.90 |
Unvested at December 31, 2023 |  |  | 57,982 |  |  | $ | 317.23 |
Summary of Activity for PBRSUs for Employees | The following table summarizes our activity for PBRSUs for employees during 2023:
|  | Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Unvested at January 1, 2023 |  |  | 54,536 |  |  | $ | 231.03 |
Granted (a) |  |  | — |  |  |  | — |
Vested |  |  | (35,463 | ) |  |  | 228.24 |
Forfeited |  |  | (1,694 | ) |  |  | 263.43 |
Unvested at December 31, 2023 |  |  | 17,379 |  |  | $ | 254.93 |
(a) PBRSUs earned may range from zero to 200% of the target award. PBRSUs granted for the 2023 performance period were not earned as the performance metrics were not met.
Summary of the Changes in the Number of Outstanding Phantom Stock Shares | A summary of the changes in the number of outstanding phantom stock awards during the year ended December 31, 2023 is provided below. There were no phantom stock awards granted during 2023.
| Total Phantom Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Balance of shares outstanding at January 1, 2023 |  | 612,520 |  |  | $ | 120.40 |
Settled |  | (24,881 | ) |  |  | 118.99 |
Forfeited |  | (28,441 | ) |  |  | 119.69 |
Balance of shares outstanding at December 31, 2023 |  | 559,198 |  |  | $ | 120.50 |
Of these outstanding awards, 1,722 phantom shares remain unvested with a weighted average grant date fair value per share of $114.76. The outstanding phantom stock awards will be settled in shares of our common stock equal to the number of vested shares of phantom stock on the applicable settlement date. The shares of common stock will generally be distributed in twenty-four substantially equal monthly installments commencing on the first day of the sixth calendar month following such settlement date.

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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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