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Compensation Related Costs, Share Based Payments (Tables)
 12 Months Ended
Dec. 31, 2024
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, 2023
126,948 $77.50 
Granted67,432 60.74 
Vested(41,168)72.46 
Forfeited(4,175)71.40 
Nonvested at December 31, 2024
149,037 $68.79 

 202420232022
Weighted-average grant date fair value (per share)
$60.74 $81.79 $76.96 
Fair value of shares granted (thousands of dollars)
$4,096 $3,995 $4,342 
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 2024, 2023 and 2022 grants at the grant date:
Number of
Units		Weighted-
Average Grant Date Fair Value
Nonvested at December 31, 2023
247,326 $95.23 
Granted139,727 67.83 
Vested— — 
Forfeited(81,568)82.85 
Nonvested at December 31, 2024
305,485 $86.00 
202420232022
Volatility (a)26.63% 29.20%34.00%
Dividend yield4.35%3.18%3.22%
Risk-free interest rate (b)4.46%4.37%1.65%
(a) - Volatility based on historical volatility over three years using daily stock price observations of our peer utilities.
(b) - Using 3-year treasury rate.

202420232022
Weighted-average grant date fair value (per share)
$67.83 $105.74 $95.80 
Fair value of shares granted (thousands of dollars)
$9,478 $10,095 $8,360