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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019, relating to the stock options awarded under the 2018 LTIP and the 2009 LTIP:
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted Average Remaining Contractual Term (Years)
 
Aggregate Intrinsic Value(a)
(In thousands)
Options outstanding at December 31, 2018
2,212,690

 
$
22.82

 
6.58
 
$
3,123

Granted
423,500

 
27.99

 
 
 
 
Exercised
(954,370
)
 
20.60

 
 
 
 
Forfeited
(58,100
)
 
27.37

 
 
 
 
Options outstanding at December 31, 2019
1,623,720

 
$
25.30

 
7.22
 
$
22,836

Options vested or expected to vest at December 31, 2019
1,571,685

 
$
25.25

 
7.19
 
$
22,198

Options exercisable at December 31, 2019
741,520

 
$
22.90

 
5.97
 
$
12,198

(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, 2019, 2018 and 2017 was established at the date of grant using the Black-Scholes pricing model, with the weighted average assumptions as follows:
 
Year Ended December 31,
 
2019
 
2018
 
2017
Risk-free interest rate
2.51
%
 
2.72
%
 
1.96
%
Expected volatility
28.81
%
 
32.01
%
 
39.49
%
Expected term (in years)
5.9

 
5.7

 
5.9

Weighted average grant date fair value of options granted during the period
$
9.06

 
$
11.31

 
$
9.45