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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
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 options and SSARs granted using the Black-Scholes option-pricing model:
 
 
2012
 
2011
 
2010
Expected stock price volatility
64
%
 
64
%
 
59
%
Expected dividend yield
—
%
 
—
%
 
—
%
Risk-free interest rate
0.7
%
 
2.1
%
 
2.4
%
Expected life of options (in years)
5.1

 
5.2

 
5.1

Weighted average fair value of options and SSARs granted
$
4.75

 
$
5.59

 
$
3.73
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes stock options and SSARs outstanding as of December 31, 2012 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 outstanding at January 1, 2010
6,611

 
$
13.99

 
 
 
 
Options granted
1,160

 
$
7.05

 
 
 
 
Options exercised
(83
)
 
$
2.17

 
 
 
 
Options canceled
(108
)
 
$
11.36

 
 
 
 
Options outstanding at December 31, 2010
7,580

 
$
13.10

 
 
 
 
Options granted
834

 
$
10.06

 
 
 
 
Options exercised
(18
)
 
$
4.93

 
 
 
 
Options canceled
(81
)
 
$
15.88

 
 
 
 
Options outstanding at December 31, 2011
8,315

 
$
12.78

 
 
 
 
Options granted
971

 
$
8.85

 
 
 
 
Options exercised
(751
)
 
$
6.24

 
 
 
 
Options canceled
(60
)
 
$
16.69

 
 
 
 
Options outstanding at December 31, 2012
8,475

 
$
12.88

 
5.8

 
$
64.7

Vested and expected to vest at December 31, 2012(1)
8,051

 
$
—

 
—

 
$
61.4

Options exercisable at December 31, 2012
6,622

 
$
14.01

 
5.0

 
$
45.3

 _______________
(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, 2012 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, 2010
570,569

 
 
 
 
Incentive shares awards granted
400,907

 
 
 
 
Incentive share awards vested
(4,236
)
 
 
 
 
Incentive share awards canceled
(11,304
)
 
 
 
 
Incentive share awards outstanding at December 31, 2010
955,936

 
 
 
 
Incentive shares awards granted
336,816

 
 
 
 
Incentive share awards vested
(121,500
)
 
 
 
 
Incentive share awards canceled
(58,384
)
 
 
 
 
Incentive share awards outstanding at December 31, 2011
1,112,868

 
 
 
 
Incentive shares awards granted
330,426

 
 
 
 
Incentive share awards vested
(407,909
)
 
 
 
 
Incentive share awards canceled
(74,997
)
 
 
 
 
Incentive share awards outstanding at December 31, 2012
960,388

 
1.1

 
$
18.6

Vested and expected to vest at December 31, 2012(1)
912,369

 
1.1

 
$
17.6

Incentive share awards exercisable at December 31, 2012
—

 
—

 
—

 _______________
(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, 2012 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, 2010
665,521

 
$
8.02

Restricted stock awards granted
210,536

 
7.00

Restrictions lapsing
(77,320
)
 
22.99

Restricted stock awards canceled
(15,448
)
 
5.93

Restricted stock awards at December 31, 2010
783,289

 
6.31

Restricted stock awards granted
149,239

 
10.14

Restrictions lapsing
(171,800
)
 
15.27

Restricted stock awards canceled
—

 
—

Restricted stock awards at December 31, 2011
760,728

 
5.04

Restricted stock awards granted
202,009

 
8.85

Restrictions lapsing
(405,750
)
 
2.17

Restricted stock awards canceled
—

 
—

Restricted stock awards at December 31, 2012
556,987

 
$
8.51