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Stock-Based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of Stock Option Activity | A summary of the Plans’ stock option activity for the nine months ended September 30, 2023 and September 30, 2022 is presented below:
Stock Options | Common Shares |  | Weighted Average Strike Price |  | Remaining Contractual Term (1) |  | Intrinsic Value (2) (in thousands)
Outstanding at January 1, 2023 | 68,093 |  |  | $ | 41.14 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (54,218) |  |  | 40.87 |  |  |  |  |
Forfeited or canceled | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2023 | 13,875 |  |  | $ | 42.18 |  |  | 4.2 |  | $ | 462 |
Exercisable at September 30, 2023 | 13,875 |  |  | $ | 42.18 |  |  | 4.2 |  | $ | 462 |
Stock Options | Common Shares |  | Weighted Average Strike Price |  | Remaining Contractual Term (1) |  | Intrinsic Value (2) (in thousands)
Outstanding at January 1, 2022 | 193,447 |  |  | $ | 41.62 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (88,355) |  |  | 42.30 |  |  |  |  |
Forfeited or canceled | (1,430) |  |  | 40.87 |  |  |  |  |
Outstanding at September 30, 2022 | 103,662 |  |  | $ | 41.04 |  |  | 1.0 |  | $ | 4,199 |
Exercisable at September 30, 2022 | 103,662 |  |  | $ | 41.04 |  |  | 1.0 |  | $ | 4,199 |
(1)Represents the remaining weighted average contractual life in years. (2)Aggregate intrinsic value represents the total pre-tax intrinsic value (i.e., the difference between the Company’s stock price on the last trading day of the quarter and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the quarter. Options with exercise prices above the stock price on the last trading day of the quarter are excluded from the calculation of intrinsic value. The intrinsic value will change based on the fair market value of the Company’s stock.
Schedule of Plans' Restricted and Performance Share Award Activity | A summary of the Plans’ restricted share activity for the nine months ended September 30, 2023 and September 30, 2022 is presented below:
| Nine months ended September 30, 2023 |  | Nine months ended September 30, 2022
Restricted Shares | Common Shares |  | Weighted Average Grant-Date Fair Value |  | Common Shares |  | Weighted Average Grant-Date Fair Value
Outstanding at January 1 | 610,155 |  |  | $ | 73.21 |  |  | 476,813 |  |  | $ | 61.33 |
Granted | 268,142 |  |  | 88.18 |  |  | 223,559 |  |  | 95.98 |
Vested and issued | (117,365) |  |  | 65.51 |  |  | (61,333) |  |  | 63.85 |
Forfeited or canceled | (12,491) |  |  | 83.47 |  |  | (18,632) |  |  | 75.26 |
Outstanding at September 30 | 748,441 |  |  | $ | 79.61 |  |  | 620,407 |  |  | $ | 73.15 |
Vested, but deferred, at September 30 | 98,747 |  |  | $ | 53.46 |  |  | 96,554 |  |  | $ | 52.94 |
A summary of the Plans’ performance-based stock award activity, based on the target level of the awards, for the nine months ended September 30, 2023 and September 30, 2022 is presented below:
| Nine months ended September 30, 2023 |  | Nine months ended September 30, 2022
Performance-based Stock | Common Shares |  | Weighted Average Grant-Date Fair Value |  | Common Shares |  | Weighted Average Grant-Date Fair Value
Outstanding at January 1 | 545,379 |  |  | $ | 70.30 |  |  | 557,255 |  |  | $ | 62.94 |
Granted | 189,219 |  |  | 92.37 |  |  | 160,463 |  |  | 97.15 |
Added by performance factor at vesting | 23,161 |  |  | 63.64 |  |  | — |  |  | — |
Vested and issued | (178,203) |  |  | 63.64 |  |  | — |  |  | — |
Forfeited or canceled | (19,289) |  |  | 82.14 |  |  | (172,001) |  |  | 71.51 |
Outstanding at September 30 | 560,267 |  |  | $ | 79.18 |  |  | 545,717 |  |  | $ | 70.30 |
Vested, but deferred, at September 30 | 36,465 |  |  | $ | 45.08 |  |  | 35,561 |  |  | $ | 44.21 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -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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