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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [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, 2020 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, 2017 |  |  | 1,208,860 |  |  | $ | 28.14 |  |  |  |  |  |  |  |  |
Options granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Options exercised |  |  | (332,810 | ) |  |  | 29.49 |  |  |  |  |  |  |  |  |
Options cancelled/forfeited/expired |  |  | (30,450 | ) |  |  | 28.27 |  |  |  |  |  |  |  |  |
Balance at December 31, 2018 |  |  | 845,600 |  |  |  | 28.14 |  |  |  |  |  |  |  |  |
Options granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Options exercised |  |  | (260,860 | ) |  |  | 29.55 |  |  |  |  |  |  |  |  |
Options cancelled/forfeited/expired |  |  | (4,600 | ) |  |  | 30.59 |  |  |  |  |  |  |  |  |
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 |  |  |  | 2.52 |  |  | $ | 15.5 |
Exercisable at December 31, 2020 |  |  | 309,695 |  |  | $ | 28.45 |  |  |  | 2.40 |  |  | $ | 12.0 |
Expected to vest after December 31, 2020 |  |  | 97,645 |  |  | $ | 32.05 |  |  |  | 2.95 |  |  | $ | 3.4 |
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, 2020:
|  | Options Outstanding |  |  | Options Exercisable |
Exercise price |  | Number outstanding at December 31, 2020 |  |  | Weighted-average remaining contractual life (Years) |  |  | Weighted-average grant date value |  |  | Number exercisable at December 31, 2020 |  |  | Weighted-average grant date value |
$20 – 25 |  |  | 206,125 |  |  |  | 2.17 |  |  | $ | 24.60 |  |  |  | 181,480 |  |  | $ | 24.60 |
$25 – 30 |  |  | 2,840 |  |  |  | 2.15 |  |  | $ | 25.12 |  |  |  | 2,290 |  |  | $ | 25.13 |
$30 – 35 |  |  | 190,585 |  |  |  | 2.88 |  |  | $ | 33.97 |  |  |  | 119,805 |  |  | $ | 33.79 |
$35 – 40 |  |  | 6,800 |  |  |  | 3.00 |  |  | $ | 39.19 |  |  |  | 5,440 |  |  | $ | 39.19 |
$40 – 45 |  |  | 3,060 |  |  |  | 3.67 |  |  | $ | 40.37 |  |  |  | 680 |  |  | $ | 40.37 |
$20 – 45 |  |  | 409,410 |  |  |  | 2.52 |  |  | $ | 29.33 |  |  |  | 309,695 |  |  | $ | 28.45 |
Schedule of Weighted-Average Assumptions Used to Determine Fair Value of Option Granted |
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, 2020:
|  |  |  |  |  | Weighted- |  |  | Aggregate |
|  |  |  |  |  | average |  |  | intrinsic |
|  | Number |  |  | grant date |  |  | value |
|  | of shares |  |  | fair value |  |  | (in millions) |
Balance at December 31, 2017 |  |  | 93,664 |  |  | $ | 33.62 |  |  |  |  |
RSUs granted |  |  | 97,260 |  |  |  | 49.47 |  |  |  |  |
RSUs vested |  |  | (30,214 | ) |  |  | 33.16 |  |  |  |  |
RSUs cancelled/forfeited/expired |  |  | (21,200 | ) |  |  | 33.88 |  |  |  |  |
Balance at December 31, 2018 |  |  | 139,510 |  |  |  | 44.73 |  |  |  |  |
RSUs granted |  |  | 83,440 |  |  |  | 59.98 |  |  |  |  |
RSUs vested |  |  | (25,862 | ) |  |  | 48.31 |  |  |  |  |
RSUs cancelled/forfeited/expired |  |  | (840 | ) |  |  | 59.84 |  |  |  |  |
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 |  |  | $ | 15.2 |

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