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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Activity [Table Text Block]
Following is a summary of stock option activity for the year ended December 31, 2012, relating to the stock options awarded under the 2009 LTIP and the 1993 Plan:
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average Remaining Contractual Term (Years)
 
Aggregate
Intrinsic Value (a) (In thousands)
Options outstanding at December 31, 2011
1,976,224

 
$
23.76

 
5.99
 
$
493

Granted
310,500

 
12.23

 
 
 
 
Exercised
(378,674
)
 
12.58

 
 
 
 
Forfeited
(123,841
)
 
23.24

 
 
 
 
Options outstanding at December 31, 2012
1,784,209

 
$
24.17

 
5.59
 
$
14,495

Options vested or expected to vest at December 31, 2012
1,761,563

 
$
24.33

 
5.56
 
$
14,169

Options exercisable at December 31, 2012
1,236,789

 
$
29.27

 
4.43
 
$
5,450


(a)Intrinsic value is defined as the amount by which the fair value of the underlying common shares exceeds the exercise price of the option.
Five Year Service Stock Options [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of our five-year service stock options granted during the years ended December 31, 2012, 2011 and 2010 was established at the date of grant using the Black-Scholes pricing model, with the weighted average assumptions as follows:
 
Year Ended December 31,
 
2012
 
2011
 
2010
Risk-free interest rate
0.82
%
 
2.39
%
 
2.29
%
Expected volatility
53.08
%
 
48.00
%
 
45.70
%
Expected term (in years)
5.5

 
5.5

 
5.5

Weighted average grant date fair value of options granted during the period
$
5.85

 
$
6.58

 
$
5.84
Two-Year Bonus Stock Options [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of our two-year bonus stock options granted during the year ended December 31, 2010 was established at the date of grant using the Black-Scholes pricing model, with the weighted average assumptions as follows:
 
Year Ended December 31,
 
2010
Risk-free interest rate
2.29
%
Expected volatility
45.70
%
Expected term (in years)
4.5

Weighted average grant date fair value of options granted during the period
$
5.31