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Stock Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Weighted Average Assumptions | The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions used:
Grant Year |  | Dividend Yield |  | Expected Volatility |  | Risk Free Interest Rate |  | Expected Lives
2024 |  | 5% |  | 45% |  | 4% |  | 6
2023 |  | 5% |  | 45% |  | 4% |  | 6
2022 |  | 5% |  | 45% |  | 2% |  | 6
Stock Option Transactions under Various Stock-Based Employee Compensation Plans | Information regarding stock options under the 1996 Plan for the year ended December 31, 2024 is as follows:
| Shares |  | Weighted Average Exercise Price |  | Weighted Average Contractual Life
Outstanding, beginning of year | 391,015 |  |  | $ | 85.81 |  |  |
Granted | 45,000 |  |  | 122.37 |  |  |
Exercised | (112,575) |  |  | 80.74 |  |  |
Forfeited | — |  |  | — |  |  |
Expired | — |  |  | — |  |  |
Outstanding, end of year | 323,440 |  |  | $ | 92.67 |  |  | 6.32
Exercisable at end of year | 211,640 |  |  | $ | 85.35 |  |  | 5.31
Summary of LTIP Under 1996 Plan | Information regarding LTIP Units under the 1996 Plan for the year ended December 31, 2024 is as follows:
| Shares |  | Weighted Average Grant Date Fair Value
Outstanding, beginning of year | 176,000 |  |  | $ | 95.50 |
Granted | 120,000 |  |  | 117.29 |
Exercised | — |  |  | — |
Forfeited | (35,200) |  |  | 102.03 |
Outstanding, end of year | 260,800 |  |  | $ | 104.64 |
Vested at end of year | 140,800 |  |  | $ | 93.87 |
Summary of ESPP Share Activity | The following is a summary of 2019 ESPP share activity for the year ended December 31, 2024:
| Shares
Available for future purchases, January 1, 2024 | 242,292 |
Additional shares reserved under 2019 ESPP | 87,645 |
Purchases | (125,409) |
Available for future purchases, December 31, 2024 | 204,528 |

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, 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)(2) -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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- Definition Tabular disclosure of employee stock purchase plan activity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -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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