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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015, 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, 2014
2,016,368

 
$
24.47

 
5.71
 
$
7,470

Granted
386,500

 
21.28

 
 
 
 
Exercised
(72,640
)
 
14.24

 
 
 
 
Forfeited
(221,600
)
 
43.78

 
 
 
 
Options outstanding at December 31, 2015
2,108,628

 
$
22.21

 
5.83
 
$
6,300

Options vested or expected to vest at December 31, 2015
2,084,208

 
$
22.07

 
5.72
 
$
6,544

Options exercisable at December 31, 2015
1,453,728

 
$
22.19

 
4.65
 
$
5,884

(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-based stock options granted during the years ended December 31, 2015, 2014 and 2013 was established at the date of grant using the Black-Scholes pricing model, with the weighted average assumptions as follows:
 
Year Ended December 31,
 
2015
 
2014
 
2013
Risk-free interest rate
1.72
%
 
1.75
%
 
0.88
%
Expected volatility
56.37
%
 
57.99
%
 
56.70
%
Expected term (in years)
5.6

 
5.6

 
5.5

Weighted average grant date fair value of options granted during the period
$
11.07

 
$
12.64

 
$
11.97