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Stock-Based Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2025
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of Stock Option Activity | A summary of the Plans’ stock option activity for the six months ended June 30, 2025 and June 30, 2024 is presented below:
Stock Options | Common Shares |  | Weighted Average Strike Price |  | Remaining Contractual Term (1) |  | Intrinsic Value (2) (in thousands)
Outstanding at January 1, 2025 | 10,825 |  |  | $ | 43.76 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (5,150) |  |  | 42.61 |  |  |  |  |
Forfeited or canceled | — |  |  | — |  |  |  |  |
Outstanding at June 30, 2025 | 5,675 |  |  | $ | 44.81 |  |  | 3.2 |  | $ | 449 |
Exercisable at June 30, 2025 | 5,675 |  |  | $ | 44.81 |  |  | 3.2 |  | $ | 449 |
Stock Options | Common Shares |  | Weighted Average Strike Price |  | Remaining Contractual Term (1) |  | Intrinsic Value (2) (in thousands)
Outstanding at January 1, 2024 | 13,100 |  |  | $ | 42.76 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (775) |  |  | 32.26 |  |  |  |  |
Forfeited or canceled | — |  |  | — |  |  |  |  |
Outstanding at June 30, 2024 | 12,325 |  |  | $ | 43.42 |  |  | 4.0 |  | $ | 680 |
Exercisable at June 30, 2024 | 12,325 |  |  | $ | 43.42 |  |  | 4.0 |  | $ | 680 |
(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 six months ended June 30, 2025 and June 30, 2024 is presented below:
| Six months ended June 30, 2025 |  | Six months ended June 30, 2024
Restricted Shares | Common Shares |  | Weighted Average Grant-Date Fair Value |  | Common Shares |  | Weighted Average Grant-Date Fair Value
Outstanding at January 1 | 880,866 |  |  | $ | 90.95 |  |  | 746,123 |  |  | $ | 79.60 |
Granted | 254,059 |  |  | 133.14 |  |  | 389,198 |  |  | 99.50 |
Vested and issued | (201,993) |  |  | 94.27 |  |  | (228,719) |  |  | 69.54 |
Forfeited or canceled | (17,703) |  |  | 106.93 |  |  | (7,893) |  |  | 91.47 |
Outstanding at June 30 | 915,229 |  |  | $ | 101.62 |  |  | 898,709 |  |  | $ | 90.68 |
Vested, but deferred, at June 30 | 101,426 |  |  | $ | 55.02 |  |  | 99,844 |  |  | $ | 53.98 |
A summary of the Plans’ performance-based stock award activity, based on the target level of the awards, for the six months ended June 30, 2025 and June 30, 2024 is presented below:
| Six months ended June 30, 2025 |  | Six months ended June 30, 2024
Performance-based Stock | Common Shares |  | Weighted Average Grant-Date Fair Value |  | Common Shares |  | Weighted Average Grant-Date Fair Value
Outstanding at January 1 | 454,017 |  |  | $ | 93.57 |  |  | 553,026 |  |  | $ | 79.69 |
Granted | 87,844 |  |  | 134.58 |  |  | 96,952 |  |  | 58.78 |
Added by performance factor at vesting | 75,461 |  |  | 96.51 |  |  | 111,304 |  |  | 100.44 |
Vested and issued | (230,957) |  |  | 95.26 |  |  | (295,644) |  |  | 58.69 |
Forfeited or canceled | (7,376) |  |  | 104.88 |  |  | (3,154) |  |  | 95.94 |
Outstanding at June 30 | 378,989 |  |  | $ | 102.41 |  |  | 462,484 |  |  | $ | 93.61 |
Vested, but deferred, at June 30 | 13,231 |  |  | $ | 40.53 |  |  | 21,593 |  |  | $ | 43.95 |

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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -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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