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Stock option and award plan: (Tables) | 12 Months Ended
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Dec. 31, 2025
Stock option and award plan: |
Schedule of assumptions used for determining the fair value of options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended |
​ | ​ | December 31, | ​
Black-Scholes Assumptions | ​ ​ ​ | 2025 | ​ ​ ​ | 2024 | ​ ​ ​ | 2023 |
Dividend yield |  | 7.1 | % | 6.0 | % | 5.8 | %
Expected volatility |  | 30.4 | % | 34.9 | % | 33.4 | %
Risk-free interest rate |  | 4.3 | % | 4.1 | % | 3.8 | %
Expected life of the option term (in years) |  | 4.1 | ​ | 4.1 | ​ | 4.1 | ​
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | Number of | ​ ​ ​ | Weighted-Average
​ | ​ ​ ​ | Options | ​ ​ ​ | Exercise Price
Outstanding at December 31, 2024 |  | 220,956 | ​ | $ | 65.58
Granted |  | 103,960 | ​ | $ | 52.63
Cancelled and expired |  | (75,071) | ​ | $ | 65.09
Exercised—intrinsic value $0.1 million; cash received $0.2 million |  | (3,766) | ​ | $ | 46.70
Outstanding at December 31, 2025—$0 million intrinsic value and 7.3 years weighted-average remaining contractual term |  | 246,079 | ​ | $ | 60.55
Exercisable at December 31, 2025—$0 million intrinsic value and 6.0 years weighted-average remaining contractual term |  | 129,153 | ​ | $ | 62.56
Expected to vest—$0 million intrinsic value and 7.1 years weighted-average remaining contractual term |  | 211,914 | ​ | $ | 61.31
Schedule of non-vested restricted stock awards | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average
​ | ​ | ​ | ​ | Grant Date
Non-vested awards | ​ ​ ​ | Shares | ​ ​ ​ | Fair Value
Non-vested at December 31, 2024 |  | 1,489,277 | ​ | $ | 64.45
Granted |  | 1,497,592 | ​ | $ | 35.48
Vested |  | (505,687) | ​ | $ | 61.97
Forfeited |  | (132,307) | ​ | $ | 63.93
Non-vested at December 31, 2025 |  | 2,348,875 | ​ | $ | 46.55
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | Years Ended
​ |  | December 31,
Additional Award Plan Information – Related to Stock Options & Restricted Stock (thousands) |  | 2025 | ​ ​ | 2024 | ​ ​ ​ | 2023
Equity-based compensation expense | ​ | $ | 26,417 | ​ | $ | 25,738 | ​ | $ | 26,924
Income tax benefit related to stock options and restricted stock | ​ |  | 2,412 | ​ |  | 2,469 | ​ |  | 3,307
Capitalized compensation expense related to stock options and restricted stock | ​ |  | 3,521 | ​ |  | 3,100 | ​ |  | 3,541
Intrinsic value of stock options exercised | ​ |  | 52 | ​ |  | 573 | ​ |  | 456
Fair value of shares of restricted stock vested | ​ |  | 25,525 | ​ |  | 22,489 | ​ |  | 30,113

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