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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
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:
 
 
2016
 
2015
 
2014
Expected stock price volatility
45
%
 
54
%
 
57
%
Expected dividend yield
—
%
 
—
%
 
—
%
Risk-free interest rate
1.4
%
 
1.5
%
 
1.5
%
Expected life of options (in years)
6.0 years

 
6.0 years

 
5.0 years

Weighted average fair value of options and SSARs granted
$
6.99

 
$
8.80

 
$
9.03
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes stock options and SSARs outstanding as of December 31, 2016 as well as activity during the three year period then ended. 
Share amounts in thousands
Options/
SSARs
 
Weighted
Average
Exercise Price
 
Weighted
Average
Contractual
Term (in years)
 
Aggregate
Intrinsic
Value
(in millions)
Outstanding at January 1, 2014
6,937

 
$
14.26

 
 
 
 
Granted
494

 
$
18.09

 
 
 
 
Exercised
(43
)
 
$
9.92

 
 
 
 
Canceled
(384
)
 
$
21.14

 
 
 
 
Outstanding at December 31, 2014
7,004

 
$
14.19

 
 
 
 
Granted
378

 
$
17.04

 
 
 
 
Exercised
(1,334
)
 
$
10.76

 
 
 
 
Canceled
(309
)
 
$
25.83

 
 
 
 
Outstanding at December 31, 2015
5,739

 
$
14.54

 
 
 
 
Granted
509

 
$
15.74

 
 
 
 
Exercised
(1,593
)
 
$
7.84

 
 
 
 
Canceled
(426
)
 
$
28.18

 
 
 
 
Outstanding at December 31, 2016
4,229

 
$
15.84

 
4.3
 
$
17.4

Vested and expected to vest at December 31, 2016(1)
4,181

 
$
15.84

 
4.3
 
$
17.3

Exercisable at December 31, 2016
3,352

 
$
15.68

 
3.3
 
$
15.3

 _______________
(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 incentive share awards outstanding as of December 31, 2016 as well as activity during the three-year period then ended. 
 
Shares
 
Weighted
Average
Contractual
Term (in years)
 
Aggregate
Intrinsic
Value
(in millions)
Outstanding at January 1, 2014
752,595

 
 
 
 
Granted
123,982

 
 
 
 
Vested
(253,834
)
 
 
 
 
Canceled
(29,130
)
 
 
 
 
Outstanding at December 31, 2014
593,613

 
 
 
 
Granted
252,629

 
 
 
 
Vested
(285,495
)
 
 
 
 
Canceled
(24,765
)
 
 
 
 
Outstanding at December 31, 2015
535,982

 
 
 
 
Granted
297,173

 
 
 
 
Vested
(147,676
)
 
 
 
 
Canceled
(9,212
)
 
 
 
 
Outstanding at December 31, 2016
676,267

 
1.1
 
$
12.8
Restricted Stock Activity [Table Text Block]
The following table summarizes restricted stock awards outstanding as of December 31, 2016 as well as activity during the three year period then ended. 
 
Number
of Shares
 
Weighted Average
Grant Date
Fair Value
Outstanding at January 1, 2014
512,085

 
$
11.48

Granted
122,649

 
17.93

Restrictions lapsing
(170,567
)
 
9.54

Canceled
(11,021
)
 
12.35

Outstanding at December 31, 2014
453,146

 
13.93

Granted
69,744

 
17.04

Restrictions lapsing
(225,645
)
 
8.71

Canceled
(14,544
)
 
19.29

Outstanding at December 31, 2015
282,701

 
18.59

Granted
160,441

 
15.74

Restrictions lapsing
(97,605
)
 
20.49

Canceled
—

 
—

Outstanding at December 31, 2016
345,537

 
$
16.73