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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Payment Arrangement, Activity [Table Text Block]
Following is a summary of stock option activity for the year ended December 31, 2024, relating to the stock options awarded under the 2018 LTIP and the 2009 LTIP:
 SharesWeighted
Average
Exercise
Price		Weighted Average Remaining Contractual Term (Years)
Aggregate Intrinsic Value(a)
(In thousands)
Options outstanding at December 31, 2023
1,521,565 $48.84 7.53$135,269 
Granted— — 
Exercised(481,665)44.20 
Forfeited(39,400)52.51 
Options outstanding at December 31, 2024
1,000,500 $50.93 6.91$82,062 
Options vested or expected to vest at December 31, 2024
971,040 $50.86 6.90$79,710 
Options exercisable at December 31, 2024
183,300 $41.82 5.40$16,704 
(a)Intrinsic value is defined as the amount by which the fair value of the underlying common shares exceeds the exercise price of the option.
Share-Based Payment Arrangement, Restricted Stock Unit, Activity
The following table summarizes employee restricted share units activity for the year ended December 31, 2024, relating to the restricted share units awarded to employees under the 2018 LTIP:

 Shares
Weighted Average Grant price
Employee RSUs outstanding at December 31, 2023
— $— 
Granted133,149 124.66
Vested
— $— 
Forfeited(3,208)124.66
Employee RSUs outstanding at December 31, 2024
129,941 $124.66 
Share-Based Payment Arrangement, Nonemployee Director Award Plan, Activity
The following table summarizes director restricted stock units activity for the year ended December 31, 2024, relating to the restricted stock units awarded to directors under the 2018 LTIP:
 Shares
Weighted Average Grant price
Director RSUs outstanding at December 31, 2023
68,342 $57.79 
Granted11,354 123.23
Exercised
— — 
Forfeited— — 
Director RSUs outstanding at December 31, 2024
79,696 $67.11 
Vested or expected to vest at December 31, 2024
68,342 $57.79 
Share-Based Payment Arrangement, Performance Shares, Activity
The following table summarizes PSU activity for the year ended December 31, 2024, relating to the PSU’s awarded under the 2018 LTIP:
Market Conditions
Performance Conditions
 Shares
Aggregate Intrinsic Value(a)
(In thousands)
Shares
Aggregate Intrinsic Value(a)
(In thousands)
PSUs outstanding at December 31, 2023
18,345 $1,488 73,392 $6,269 
Granted4,171 16,685 
Adjustment for performance results achieved (b)
3,088 12,349 
Vested
(9,262)(37,050)
Forfeited— — 
PSUs outstanding at December 31, 2024
16,342 $1,013 65,376 $3,913 
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award
The following table summarizes deferred compensation activity under the Executive Plan for the year ended December 31, 2024:
 Shares
Weighted Average share price
Deferred Compensation Equity Units outstanding at December 31, 2023
52,552 $48.95 
Additions
846 135.93
Dividends
— — 
Distributions
(8,747)40.05 
Deferred Compensation Equity Units outstanding at December 31, 2024
44,651 $52.34 
Five Year Service Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of our five-year service-based stock options granted during the years ended December 31, 2023 and 2022 was established at the date of grant using the Black-Scholes pricing model, with the weighted average assumptions as follows:
 Year Ended December 31,
 20232022
Risk-free interest rate4.02 %1.87%
Expected volatility38.54 %34.06%
Expected term (in years)5.55.4
Weighted average grant date fair value of options granted during the period$24.67$16.29