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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The following table sets out the weighted average assumptions used to estimate the fair value of the SSARs granted using the Black-Scholes option-pricing model:
 
2017
 
2016
 
2015
Expected stock price volatility
41
%
 
45
%
 
54
%
Expected dividend yield
—
%
 
—
%
 
—
%
Risk-free interest rate
2.1
%
 
1.4
%
 
1.5
%
Expected life of options (in years)
6.0 years

 
6 years

 
6 years

Weighted average fair value of options and SSARs granted
$
8.02

 
$
6.99

 
$
8.80
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes stock options and SSARs outstanding as of December 31, 2017 as well as activity during the last year. 
 
Options/
SSARs
 
Weighted
Average
Exercise Price
 
Weighted
Average
Contractual
Term (in years)
 
Aggregate
Intrinsic
Value
(in millions)
Outstanding at December 31, 2016
4,229,247

 
$
15.84

 
 
 
 
Granted
285,934

 
$
19.14

 
 
 
 
Exercised
(1,093,553
)
 
$
12.79

 
 
 
 
Expired
(993,752
)
 
$
22.94

 
 
 
 
Forfeited
(23,068
)
 
$
16.54

 
 
 
 
Outstanding at December 31, 2017
2,404,808

 
$
14.76

 
5.8
 
$
27.7

Vested and expected to vest at December 31, 2017(1)
2,284,568

 
$
14.76

 
5.8
 
$
27.5

Exercisable at December 31, 2017
1,703,031

 
$
13.70

 
4.8
 
$
21.4

 _______________
(1) 
Expected to vest based upon historical forfeiture rate
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table summarizes restricted awards outstanding as of December 31, 2017 as well as activity during the past year. 
 
Shares
 
Weighted Average Grant Date Fair Value
 
Weighted
Average
Contractual
Term (in years)
 
Aggregate
Intrinsic
Value
(in millions)
Outstanding at December 31, 2016
676,267

 
$
16.64

 
 
 
 
Granted
249,011

 
$
20.11

 
 
 
 
Vested
(207,306
)
 
$
17.17

 
 
 
 
Forfeited
(54,802
)
 
$
16.92

 
 
 
 
Outstanding at December 31, 2017
663,170

 
$
17.75

 
1.2
 
$
17.4
Restricted Stock Activity [Table Text Block]