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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation, Activity [Table Text Block]
Following is a summary of stock option activity for the year ended December 31, 2017, relating to the stock options awarded under the 2009 LTIP and the 1993 Plan:
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted Average Remaining Contractual Term (Years)
 
Aggregate Intrinsic Value(a)
(In thousands)
Options outstanding at December 31, 2016
2,309,128

 
$
19.96

 
5.93
 
$
13,773

Granted
408,000

 
23.34

 
 
 
 
Exercised
(678,781
)
 
16.54

 
 
 
 
Forfeited
(215,529
)
 
32.74

 
 
 
 
Options outstanding at December 31, 2017
1,822,818

 
$
20.48

 
6.88
 
$
25,376

Options vested or expected to vest at December 31, 2017
1,762,478

 
$
20.46

 
6.83
 
$
24,572

Options exercisable at December 31, 2017
1,054,418

 
$
20.05

 
5.93
 
$
15,127

(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, 2017, 2016 and 2015 was established at the date of grant using the Black-Scholes pricing model, with the weighted average assumptions as follows:
 
Year Ended December 31,
 
2017
 
2016
 
2015
Risk-free interest rate
1.96
%
 
1.34
%
 
1.72
%
Expected volatility
39.49
%
 
47.20
%
 
56.37
%
Expected term (in years)
5.9

 
5.7

 
5.6

Weighted average grant date fair value of options granted during the period
$
9.45

 
$
7.57

 
$
11.07