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Accounting for Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Schedule of Stock-based Compensation Expense | The total stock-based compensation expense for the years ended December 31, 2023, 2022, and 2021, the unrecognized compensation expense at December 31, 2023, and the weighted-average period to recognize the remaining unrecognized shares are as follows:
|  | Stock-Based Compensation Expense |
|  | Recognized as of December 31, |  |  | Unrecognized as of December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | Weighted Average Period to Recognize (years) |
Restricted Stock Units |  | $ | 9,413 |  |  | $ | 9,300 |  |  | $ | 8,563 |  |  | $ | 13,517 |  |  |  | 1.7 |
Cash-Settled Restricted Stock Units |  |  | 8,061 |  |  |  | 5,709 |  |  |  | 8,251 |  |  |  | 11,558 |  |  |  | 1.7 |
Non-Employee Director Awards |  |  | 1,029 |  |  |  | 1,087 |  |  |  | 937 |  |  |  | 481 |  |  |  | 0.4 |
Performance Shares |  |  | 4,416 |  |  |  | 2,784 |  |  |  | 3,731 |  |  |  | 4,351 |  |  |  | 1.5 |
Total |  | $ | 22,919 |  |  | $ | 18,880 |  |  | $ | 21,482 |  |  | $ | 29,907 |  |  |  |
Outstanding Stock Option Activity | The following table summarizes the changes in outstanding stock options:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2021 |  |  | 38,227 |  |  | $ | 31.93 |  |  |  |
Exercised |  |  | (8,535 | ) |  | $ | 27.17 |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |
Forfeited/Expired |  |  | — |  |  | $ | — |  |  |  |
Outstanding at December 31, 2021 |  |  | 29,692 |  |  | $ | 33.30 |  |  |  |
Exercised |  |  | (18,807 | ) |  | $ | 32.04 |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |
Forfeited/Expired |  |  | — |  |  | $ | — |  |  |  |
Outstanding at December 31, 2022 |  |  | 10,885 |  |  | $ | 35.49 |  |  |  |
Exercised |  |  | (8,254 | ) |  | $ | 33.84 |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |
Forfeited/Expired |  |  | — |  |  | $ | — |  |  |  |
Outstanding at December 31, 2023 |  |  | 2,631 |  |  | $ | 40.68 |  |  | $ | 246 |
Vested plus expected to vest at December 31, 2023 |  |  | 2,631 |  |  | $ | 40.68 |  |  | $ | 246 |
Exercisable at December 31, 2023 |  |  | 2,631 |  |  | $ | 40.68 |  |  | $ | 246 |
Schedule of Stock Options Outstanding by Exercise Price Range | Information regarding stock options outstanding as of December 31, 2023 is summarized below:
|  | OPTIONS OUTSTANDING |  |  | OPTIONS EXERCISABLE |
Range of Exercise Prices |  | Number Outstanding As of December 31, 2023 |  |  | Weighted Average Remaining Contractual Term |  |  | Weighted Average Exercise Price |  |  | Number Exercisable As of December 31, 2023 |  |  | Weighted Average Exercise Price |
$40.68 to $40.68 |  |  | 2,631 |  |  |  | 0.2 |  |  | $ | 40.68 |  |  |  | 2,631 |  |  | $ | 40.68 |
Summary of Non-employee Director Awards | The Company grants awards of registered shares to its non-employee directors on an annual basis under the A&R Omnibus Plan. A summary of the non-employee director awards is presented below:
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |  |  | Aggregate Intrinsic Value |
Non-vested RSUs at January 1, 2021 |  |  | 6,510 |  |  | $ | 64.47 |  |  |  |
Granted |  |  | 11,186 |  |  | $ | 90.73 |  |  |  |
Vested |  |  | (12,110 | ) |  | $ | 76.61 |  |  |  |
Cancelled |  |  | — |  |  | $ | — |  |  |  |
Non-vested RSUs at December 31, 2021 |  |  | 5,586 |  |  | $ | 90.73 |  |  |  |
Granted |  |  | 11,399 |  |  | $ | 95.35 |  |  |  |
Vested |  |  | (11,637 | ) |  | $ | 93.39 |  |  |  |
Cancelled |  |  | — |  |  | $ | — |  |  |  |
Non-vested RSUs at December 31, 2022 |  |  | 5,348 |  |  | $ | 94.79 |  |  |  |
Granted |  |  | 8,211 |  |  | $ | 127.81 |  |  |  |
Vested |  |  | (9,457 | ) |  | $ | 109.14 |  |  |  |
Cancelled |  |  | — |  |  | $ | — |  |  |  |
Non-vested RSUs at December 31, 2023 |  |  | 4,102 |  |  | $ | 127.81 |  |  | $ | 550 |
RSUs expected to vest in the future |  |  | 4,102 |  |  | $ | 127.81 |  |  | $ | 550 |
Summary of Performance Shares Activity | A summary of the Company’s PSAs is presented below.
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |  |  | Aggregate Intrinsic Value |
Non-vested PSAs at January 1, 2021 |  |  | 142,121 |  |  | $ | 68.19 |  |  |  |
Granted |  |  | 54,216 |  |  | $ | 85.03 |  |  |  |
Vested |  |  | (63,258 | ) |  | $ | 65.05 |  |  |  |
Cancelled |  |  | — |  |  | $ | — |  |  |  |
Non-vested PSAs at December 31, 2021 |  |  | 133,079 |  |  | $ | 76.54 |  |  |  |
Granted |  |  | 38,412 |  |  | $ | 93.15 |  |  |  |
Vested |  |  | (47,634 | ) |  | $ | 82.38 |  |  |  |
Cancelled |  |  | (3,170 | ) |  | $ | 80.64 |  |  |  |
Non-vested PSAs at December 31, 2022 |  |  | 120,687 |  |  | $ | 79.42 |  |  |  |
Granted |  |  | 36,956 |  |  | $ | 115.67 |  |  |  |
Vested |  |  | (45,141 | ) |  | $ | 58.76 |  |  |  |
Cancelled |  |  | (6,934 | ) |  | $ | 61.49 |  |  |  |
Non-vested PSAs at December 31, 2023 |  |  | 105,568 |  |  | $ | 102.12 |  |  | $ | 14,156 |
PSAs expected to vest in the future |  |  | 69,650 |  |  | $ | 104.95 |  |  | $ | 9,339 |
Schedule of Fair Value Assumptions using Monte Carlo Simulation Model for Awards Granted | The fair value assumptions using the Monte Carlo simulation model for awards granted in 2023, 2022, and 2021 were:
|  | 2023 |  |  | 2022 |  |  | 2021 |
Dividend Yield |  |  | 0.5 | % |  |  | 0.6 | % |  |  | 0.6 | %
Historical Volatility |  |  | 33.6 | % |  |  | 39.0 | % |  |  | 40.9 | %
Risk-Free Rate of Returns |  |  | 3.8 | % |  |  | 2.1 | % |  |  | 0.3 | %
Restricted Stock Units (RSUs) |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Schedule of Restricted Stock Unit Activity | A summary of the Company’s RSUs is presented below.
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |  |  | Aggregate Intrinsic Value |
Non-vested RSUs at January 1, 2021 |  |  | 305,399 |  |  | $ | 66.51 |  |  |  |
Granted |  |  | 132,757 |  |  | $ | 95.68 |  |  |  |
Vested |  |  | (119,203 | ) |  | $ | 66.46 |  |  |  |
Cancelled |  |  | (15,117 | ) |  | $ | 68.53 |  |  |  |
Non-vested RSUs at December 31, 2021 |  |  | 303,836 |  |  | $ | 79.17 |  |  |  |
Granted |  |  | 148,361 |  |  | $ | 93.70 |  |  |  |
Vested |  |  | (140,666 | ) |  | $ | 76.53 |  |  |  |
Cancelled |  |  | (26,705 | ) |  | $ | 77.16 |  |  |  |
Non-vested RSUs at December 31, 2022 |  |  | 284,826 |  |  | $ | 88.23 |  |  |  |
Granted |  |  | 89,388 |  |  | $ | 110.80 |  |  |  |
Vested |  |  | (93,881 | ) |  | $ | 78.05 |  |  |  |
Cancelled |  |  | (21,815 | ) |  | $ | 94.01 |  |  |  |
Non-vested RSUs at December 31, 2023 |  |  | 258,518 |  |  | $ | 99.25 |  |  | $ | 34,665 |
RSUs expected to vest in the future |  |  | 230,953 |  |  | $ | 98.82 |  |  | $ | 30,968 |
Cash Settled RSUs |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Schedule of Restricted Stock Unit Activity | CSRSUs generally have a vesting term of three years. The fair value of CSRSUs vested and settled in cash for the years ended December 31, 2023, 2022, and 2021 was $7.9 million, $6.6 million and $8.7 million, respectively. A summary of the Company’s CSRSUs is presented below.
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |  |  | Aggregate Intrinsic Value |
Non-vested CSRSUs at January 1, 2021 |  |  | 241,481 |  |  | $ | 65.06 |  |  |  |
Granted |  |  | 52,246 |  |  | $ | 89.51 |  |  |  |
Vested |  |  | (104,272 | ) |  | $ | 63.96 |  |  |  |
Cancelled |  |  | (23,195 | ) |  | $ | 69.68 |  |  |  |
Non-vested CSRSUs at December 31, 2021 |  |  | 166,260 |  |  | $ | 72.79 |  |  |  |
Granted |  |  | 115,024 |  |  | $ | 97.88 |  |  |  |
Vested |  |  | (75,566 | ) |  | $ | 73.20 |  |  |  |
Cancelled |  |  | (17,299 | ) |  | $ | 80.02 |  |  |  |
Non-vested CSRSUs at December 31, 2022 |  |  | 188,419 |  |  | $ | 87.28 |  |  |  |
Granted |  |  | 70,742 |  |  | $ | 110.65 |  |  |  |
Vested |  |  | (81,537 | ) |  | $ | 76.26 |  |  |  |
Cancelled |  |  | (19,040 | ) |  | $ | 91.94 |  |  |  |
Non-vested CSRSUs at December 31, 2023 |  |  | 158,584 |  |  | $ | 102.82 |  |  | $ | 21,264 |
CSRSUs expected to vest in the future |  |  | 134,808 |  |  | $ | 102.31 |  |  | $ | 18,076 |

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