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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Summary of Company's Option Activity | A summary of the Company’s option activity and related information for the three years ended December 31, 2022 is as follows:
|  | Number of options |  |  | Weighted- average price |  |  | Weighted- average remaining contractual term (in years) |  |  | Aggregate intrinsic value (in millions) |
Balance at December 31, 2019 |  |  | 580,140 |  |  | $ | 29.57 |  |  |  |  |  |  |
Options granted |  |  | — |  |  |  | — |  |  |  |  |  |  |
Options exercised |  |  | (163,670 | ) |  |  | 30.22 |  |  |  |  |  |  |
Options cancelled/forfeited/expired |  |  | (7,060 | ) |  |  | 28.95 |  |  |  |  |  |  |
Balance at December 31, 2020 |  |  | 409,410 |  |  |  | 29.33 |  |  |  |  |  |  |
Options granted |  |  | — |  |  |  | — |  |  |  |  |  |  |
Options exercised |  |  | (133,020 | ) |  |  | 28.57 |  |  |  |  |  |  |
Options cancelled/forfeited/expired |  |  | (1,760 | ) |  |  | 34.57 |  |  |  |  |  |  |
Balance at December 31, 2021 |  |  | 274,630 |  |  |  | 29.66 |  |  |  |  |  |  |
Options granted |  |  | — |  |  |  | — |  |  |  |  |  |  |
Options exercised |  |  | (135,280 | ) |  |  | 25.61 |  |  |  |  |  |  |
Options cancelled/forfeited/expired |  |  | — |  |  |  | — |  |  |  |  |  |  |
Balance at December 31, 2022 |  |  | 139,350 |  |  | $ | 33.59 |  |  |  | 1.04 |  |  | $ | 9.1 |
Exercisable at December 31, 2022 |  |  | 139,350 |  |  | $ | 33.59 |  |  |  | 1.04 |  |  | $ | 9.1 |
Expected to vest after December 31, 2022 |  |  | 139,350 |  |  | $ | 33.59 |  |  |  | 1.04 |  |  | $ | 9.1 |
Options Outstanding and Options Exercisable by Exercise Price with Weighted-Average Remaining Contractual Life for Options Outstanding and Weighted-Average Exercise Price | The following table indicates the options outstanding and options exercisable by exercise price with the weighted-average remaining contractual life for the options outstanding and the weighted-average exercise price at December 31, 2022:
|  | Options Outstanding |  |  | Options Exercisable |
Exercise price |  | Number outstanding at December 31, 2022 |  |  | Weighted-average remaining contractual life (Years) |  |  | Weighted-average grant date value |  |  | Number exercisable at December 31, 2022 |  |  | Weighted-average grant date value |
$20 – 25 |  |  | 16,850 |  |  |  | 0.17 |  |  | $ | 24.60 |  |  |  | 16,850 |  |  | $ | 24.60 |
$25 – 30 |  |  | — |  |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
$30 – 35 |  |  | 115,020 |  |  |  | 1.16 |  |  | $ | 34.54 |  |  |  | 115,020 |  |  | $ | 34.54 |
$35 – 40 |  |  | 6,800 |  |  |  | 1.00 |  |  | $ | 39.19 |  |  |  | 6,800 |  |  | $ | 39.19 |
$40 – 45 |  |  | 680 |  |  |  | 1.67 |  |  | $ | 40.37 |  |  |  | 680 |  |  | $ | 40.37 |
$20 – 45 |  |  | 139,350 |  |  |  | 1.04 |  |  | $ | 33.59 |  |  |  | 139,350 |  |  | $ | 33.59 |
Summary of Company's Restricted Stock Units Activity | The following table summarizes the activity of the Company’s RSUs, which includes service-based and performance-based awards, for the three years ended December 31, 2022:
|  |  |  |  | Weighted- |  |  | Aggregate |
|  |  |  |  | average |  |  | intrinsic |
|  | Number |  |  | grant date |  |  | value |
|  | of shares |  |  | fair value |  |  | (in millions) |
Balance at December 31, 2019 |  |  | 196,248 |  |  | $ | 50.68 |  |  |  |
RSUs granted |  |  | 126,540 |  |  |  | 50.99 |  |  |  |
RSUs vested |  |  | (89,225 | ) |  |  | 43.42 |  |  |  |
RSUs cancelled/forfeited/expired |  |  | (7,593 | ) |  |  | 57.93 |  |  |  |
Balance at December 31, 2020 |  |  | 225,970 |  |  |  | 57.06 |  |  |  |
RSUs granted |  |  | 116,326 |  |  |  | 72.75 |  |  |  |
RSUs vested |  |  | (116,242 | ) |  |  | 53.32 |  |  |  |
RSUs cancelled/forfeited/expired |  |  | (8,646 | ) |  |  | 52.78 |  |  |  |
Balance at December 31, 2021 |  |  | 217,408 |  |  |  | 67.63 |  |  |  |
RSUs granted |  |  | 95,028 |  |  |  | 77.79 |  |  |  |
RSUs vested |  |  | (114,274 | ) |  |  | 58.30 |  |  |  |
RSUs cancelled/forfeited/expired |  |  | (10,754 | ) |  |  | 70.10 |  |  |  |
Balance at December 31, 2022 |  |  | 187,408 |  |  | $ | 76.74 |  |  | $ | 18.4 |

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