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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2023
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, 2023, 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, 2022
2,018,700 $40.33 7.06$15,241 
Granted495,500 58.90 
Exercised(944,135)35.79 
Forfeited(48,500)51.40 
Options outstanding at December 31, 2023
1,521,565 $48.84 7.53$135,269 
Options vested or expected to vest at December 31, 2023
1,476,245 $48.76 7.52$131,357 
Options exercisable at December 31, 2023
279,965 $38.49 5.58$27,786 
(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.
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, 2022 and 2021 was established at the date of grant using the Black-Scholes pricing model, with the weighted average assumptions as follows:
 Year Ended December 31,
 202320222021
Risk-free interest rate4.02 %1.87 %0.66%
Expected volatility38.54 %34.06 %31.66%
Expected term (in years)5.55.45.5
Weighted average grant date fair value of options granted during the period$24.67$16.29$15.69