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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
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:
 
 
2015
 
2014
 
2013
Expected stock price volatility
54
%
 
57
%
 
69
%
Expected dividend yield
—
%
 
—
%
 
—
%
Risk-free interest rate
1.5
%
 
1.5
%
 
0.9
%
Expected life of options (in years)
6.0 years

 
5.0 years

 
5.0 years

Weighted average fair value of options and SSARs granted
$
8.80

 
$
9.03

 
$
11.68
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes stock options and SSARs outstanding as of December 31, 2015 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)
Options / SSARS outstanding at January 1, 2013
8,475

 
$
12.88

 
 
 
 
Options granted
343

 
$
20.49

 
 
 
 
Options / SSARS exercised
(1,861
)
 
$
9.06

 
 
 
 
Options / SSARS canceled
(20
)
 
$
22.23

 
 
 
 
Options / SSARS outstanding at December 31, 2013
6,937

 
$
14.26

 
 
 
 
Options granted
494

 
$
18.09

 
 
 
 
Options / SSARS exercised
(43
)
 
$
9.92

 
 
 
 
Options / SSARS canceled
(384
)
 
$
21.14

 
 
 
 
Options / SSARS outstanding at December 31, 2014
7,004

 
$
14.19

 
 
 
 
Options granted
378

 
$
17.04

 
 
 
 
Options / SSARS exercised
(1,334
)
 
$
10.76

 
 
 
 
Options / SSARS canceled
(309
)
 
$
25.83

 
 
 
 
Options / SSARS outstanding at December 31, 2015
5,739

 
$
14.54

 
4.2
 
$
29.8

Vested and expected to vest at December 31, 2015(1)
5,714

 
$
14.54

 
4.2
 
$
29.8

Options / SSARS exercisable at December 31, 2015
4,987

 
$
14.04

 
3.6
 
$
29.5

 _______________
(1) 
Options or SSARS 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, 2015 as well as activity during the three-year period then ended. 
 
Shares
 
Weighted
Average
Contractual
Term (in years)
 
Aggregate
Intrinsic
Value
(in millions)
Incentive share awards outstanding at January 1, 2013
960,388

 
 
 
 
Incentive shares awards granted
166,474

 
 
 
 
Incentive share awards vested
(350,107
)
 
 
 
 
Incentive share awards canceled
(24,160
)
 
 
 
 
Incentive share awards outstanding at December 31, 2013
752,595

 
 
 
 
Incentive shares awards granted
123,982

 
 
 
 
Incentive share awards vested
(253,834
)
 
 
 
 
Incentive share awards canceled
(29,130
)
 
 
 
 
Incentive share awards outstanding at December 31, 2014
593,613

 
 
 
 
Incentive shares awards granted
252,629

 
 
 
 
Incentive share awards vested
(285,495
)
 
 
 
 
Incentive share awards canceled
(24,765
)
 
 
 
 
Incentive share awards outstanding at December 31, 2015
535,982

 
1.3

 
$
9.7

Vested and expected to vest at December 31, 2015(1)
503,552

 
1.3

 
$
9.1

Incentive share awards exercisable at December 31, 2015
—

 
—

 
—

 _______________
(1) 
Incentive shares expected to vest based upon historical forfeitures rate
Restricted Stock Activity [Table Text Block]
The following table summarizes restricted stock awards outstanding as of December 31, 2015 as well as activity during the three year period then ended. 
 
Number
of Shares
 
Weighted Average
Grant Date
Fair Value
Restricted stock awards outstanding at January 1, 2013
625,049

 
$
8.46

Restricted stock awards granted
108,174

 
20.49

Restrictions lapsing
(221,138
)
 
7.37

Restricted stock awards canceled
—

 
—

Restricted stock awards at December 31, 2013
512,085

 
11.48

Restricted stock awards granted
122,649

 
17.93

Restrictions lapsing
(170,567
)
 
9.54

Restricted stock awards canceled
(11,021
)
 
12.35

Restricted stock awards at December 31, 2014
453,146

 
13.93

Restricted stock awards granted
69,744

 
17.04

Restrictions lapsing
(225,645
)
 
8.71

Restricted stock awards canceled
(14,544
)
 
19.29

Restricted stock awards at December 31, 2015
282,701

 
$
18.59