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Compensation Related Costs, Share Based Payments (Tables)
 12 Months Ended
Dec. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity The following tables set forth activity and various statistics for restricted stock unit awards outstanding under the respective plans for the period indicated:
Number of
Units		Weighted-
Average Grant Date Fair Value
Nonvested at December 31, 2024
149,037 $68.79 
Granted105,538 71.56 
Vested(43,094)68.19 
Forfeited(9,073)69.34 
Nonvested at December 31, 2025
202,408 $70.32 

 202520242023
Weighted-average grant date fair value (per share)
$71.56 $60.74 $81.79 
Fair value of shares granted (thousands of dollars)
$7,553 $4,096 $3,995 
Schedule of Nonvested Performance-Based Units Activity The following tables set forth activity and various statistics related to our performance stock unit awards and the assumptions used by us in the valuations of the 2025, 2024, and 2023 grants at the grant date:
Number of
Units		Weighted-
Average Grant Date Fair Value
Nonvested at December 31, 2024
305,485 $86.00 
Granted88,532 78.60 
Vested(78,840)95.80 
Forfeited(11,960)76.38 
Nonvested at December 31, 2025
303,217 $81.68 

202520242023
Volatility (a)26.13% 26.63%29.20%
Dividend yield3.75%4.35%3.18%
Risk-free interest rate (b)4.26%4.46%4.37%
(a) - Volatility based on historical volatility over three years using daily stock price observations of our peer utilities.
(b) - Using 3-year treasury rate.

202520242023
Weighted-average grant date fair value (per share)
$78.60 $67.83 $105.74 
Fair value of shares granted (thousands of dollars)
$6,959 $9,478 $10,095