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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation [Abstract]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]
he fair value of share-based payment awards was estimated using the Black-Scholes option pricing model with the following assumptions and weighted average fair values:
 
 
December 31,
 
 
2012
 
2011
Weighted average fair value of grants
 
$
14.58

 
$
20.47

Risk-free interest rate
 
0.73
%
 
1.61
%
Expected dividend yield
 
1.18
%
 
0.82
%
Expected forfeiture rate
 
2.00
%
 
2.00
%
Expected volatility
 
54.80
%
 
55.10
%
Expected term in years
 
4.40

 
4.26
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of the status of stock options granted is presented below:
 
 
 
 
 
 
Weighted
 
 
 
 
 
 
 
 
Average
 
 
 
 
 
 
Weighted
 
Remaining
 
Aggregate
 
 
 
 
Average
 
Contractual
 
Intrinsic
 
 
 
 
Exercise
 
Term (in
 
Value (in
 
 
Shares
 
Price
 
years)
 
thousands)
Balance at December 31, 2012
 
5,111,214

 
$
36.54

 
 
 
 
Granted
 
—

 
$
—

 
 
 
 
Exercised
 
(310,376
)
 
$
11.99

 
 
 
 
Forfeited
 
(23,612
)
 
$
38.64

 
 
 
 
Balance at December 31, 2013
 
4,777,226

 
$
38.12

 
4.20

 
$
28,398

Vested and expected to vest
 
4,765,963

 
$
38.13

 
4.19

 
$
28,398

Exercisable at December 31, 2013
 
4,344,749

 
$
38.45

 
3.76

 
$
28,839
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
 
 
Number of
 
Weighted Average
 
 
Shares
 
Grant Date Fair Value
Nonvested at December 31, 2012
 
1,326,953

 
$40.39
Granted
 
654,656

 
$31.60
Vested
 
(930,390
)
 
$39.77
Forfeited
 
(169,649
)
 
$32.93
Nonvested at December 31, 2013
 
881,570

 
$35.95
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
The following represents the unvested performance share unit awards and their corresponding fair value (based upon the closing share price) at the date of grant:
 
 
Number of
 
Weighted Average
 
 
Shares
 
Grant Date Fair Value
Nonvested at December 31, 2012
 
702,194

 
$50.76
Granted
 
40,514

 
$31.35
Vested
 
(159,228
)
 
$68.45
Nonvested at December 31, 2013
 
583,480

 
$38.19
Schedule of Other Share-based Compensation, Activity [Table Text Block]
The following represents the unvested performance options and their corresponding fair value (based upon the closing share price) at the date of grant:
 
 
Number of
 
Weighted Average
 
 
Shares
 
Grant Date Fair Value
Nonvested at December 31, 2012
 
401,392

 
$16.44
Vested
 
(100,349
)
 
$16.44
Nonvested at December 31, 2013
 
301,063

 
$16.44