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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2024
Schedule of nonvested restricted stock and deferred shares activity and related information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ | ​ | 2024 | ​ | 2023 | ​ | 2022
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date
​ |  | Shares |  | Fair Value |  | Shares |  | Fair Value |  | Shares |  | Fair Value
​ | ​ | (Shares in thousands)
Unvested at beginning of year | ​ | 93 | ​ | $ | 149.96 | ​ | 121 | ​ | $ | 121.39 | ​ | 138 | ​ | $ | 97.43
Granted |  | 44 | ​ |  | 202.03 |  | 51 | ​ |  | 167.39 |  | 64 | ​ |  | 143.86
Vested |  | (47) | ​ |  | 144.02 |  | (76) | ​ |  | 112.65 |  | (78) | ​ |  | 94.33
Cancelled/Forfeitures |  | (4) | ​ |  | 169.90 |  | (3) | ​ |  | 139.46 |  | (3) | ​ |  | 120.31
Unvested at end of year |  | 86 | ​ | $ | 179.08 | ​ | 93 | ​ | $ | 149.96 |  | 121 | ​ | $ | 121.39
Schedule of the Company's RSU activity and related information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ | ​ | 2024 | ​ | 2023 | ​ | 2022
​ | ​ | ​ | ​ | Weighted | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Purchase | ​ | Intrinsic | ​ | ​ | ​ | Purchase | ​ | ​ | ​ | Purchase
​ |  | RSUs |  | Price |  | Value |  | RSUs |  | Price | ​ | RSUs |  | Price
​ | ​ | (RSUs in thousands)
Outstanding at beginning of year | ​ | 77 | ​ | $ | 114.93 | ​ | ​ | ​ | 77 | ​ | $ | 94.78 | ​ | 85 | ​ | $ | 75.34
Granted |  | 20 | ​ |  | 163.23 | ​ | ​ | ​ | 26 | ​ |  | 130.27 | ​ | 29 | ​ |  | 115.14
Settled |  | (23) | ​ |  | 97.80 | ​ | ​ | ​ | (25) | ​ |  | 66.94 | ​ | (35) | ​ |  | 64.15
Cancelled/Forfeitures |  | (2) | ​ |  | 139.60 | ​ | ​ | ​ | (1) | ​ |  | 124.04 | ​ | (2) | ​ |  | 92.09
Outstanding at end of year |  | 72 | ​ | $ | 133.34 | $ | 69.96 | ​ | 77 | ​ | $ | 114.93 | ​ | 77 | ​ | $ | 94.78
Vested at end of year |  | 25 | ​ | $ | 119.73 | $ | 83.57 | ​ | 23 | ​ | $ | 104.17 | ​ | 24 | ​ | $ | 77.69
Schedule of stock-based compensation fair value assumptions | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2024 |  | 2023 |
Expected life (years) | ​ | 3.0 | ​ | 3.0 | ​
Expected stock price volatility |  | 28.9 | % | 33.7 | %
Expected dividend yield |  | 0.80 | % | 0.80 | %
Risk-free interest rate |  | 4.5 | % | 4.1 | %
Performance stock units |
Schedule of unvested performance shares activity and related information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ | ​ | 2024 | ​ | 2023 | ​ | 2022
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date
​ |  | Shares |  | Fair Value |  | Shares |  | Fair Value |  | Shares |  | Fair Value
​ | ​ | (Shares in thousands)
Unvested at beginning of year | ​ | 113 |  | $ | 142.53 | ​ | 146 |  | $ | 107.29 | ​ | 178 |  | $ | 88.32
Granted |  | 79 | ​ | ​ | 162.23 | ​ | 99 | ​ | ​ | 106.37 | ​ | 108 | ​ | ​ | 102.98
Vested |  | (80) | ​ |  | 122.88 | ​ | (125) | ​ |  | 73.62 | ​ | (136) | ​ |  | 78.82
Cancelled/Forfeitures |  | (6) | ​ | ​ | 174.85 | ​ | (7) | ​ | ​ | 132.14 | ​ | (4) | ​ | ​ | 110.43
Unvested at end of year |  | 106 | ​ | $ | 170.42 | ​ | 113 | ​ | $ | 142.53 | ​ | 146 | ​ | $ | 107.29
Restricted stock and deferred shares |
Schedule of information about RSUs outstanding | The following table summarizes information about RSUs outstanding at December 31, 2024: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | RSUs Outstanding | ​ | RSUs Vested
​ | ​ | ​ | ​ | Weighted Average | ​ | ​ | ​ | Weighted Average
​ | ​ | Number | ​ | Purchase | ​ | Number | ​ | Purchase
Range of Purchase Prices |  | Outstanding |  | Price |  | Vested |  | Price
​ | ​ | (RSUs in thousands)
$97.28-$115.14 |  | 28 | ​ | $ | 115.14 |  | 17 | ​ | $ | 115.14
$115.15-$130.27 |  | 25 | ​ |  | 130.27 |  | 8 | ​ |  | 130.27
$130.28-$163.23 | ​ | 19 | ​ | ​ | 163.23 | ​ | — | ​ | ​ | —
​ |  | 72 | ​ | $ | 133.34 |  | 25 | ​ | $ | 119.73

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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