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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021, 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, 2020
1,625,400 $30.21 7.28$22,882 
Granted435,500 52.54 
Exercised(452,100)24.85 
Forfeited(14,200)37.94 
Options outstanding at December 31, 2021
1,594,600 $37.76 7.34$39,016 
Options vested or expected to vest at December 31, 2021
1,556,535 $37.63 7.32$38,214 
Options exercisable at December 31, 2021
576,500 $28.69 5.79$19,308 
(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, 2021, 2020 and 2019 was established at the date of grant using the Black-Scholes pricing model, with the weighted average assumptions as follows:
 Year Ended December 31,
 202120202019
Risk-free interest rate0.66 %1.42 %2.51%
Expected volatility31.66 %29.15 %28.81%
Expected term (in years)5.55.65.9
Weighted average grant date fair value of options granted during the period$15.69$12.65$9.06