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Summary of Significant Accounting Policies (Tables)
3 Months Ended
Jun. 30, 2013
Accounting Policies [Abstract]  
Awards outstanding [Table Text Block]

The following table presents the number of shares or units outstanding for each award type as of June 30, 2013 and December 31, 2012, respectively.
 
Award type
 
June 30, 2013

 
December 31, 2012

Stock options
 
1,214,690

 
1,474,828

Restricted stock units
 
1,596,935

 
1,182,726

Stock appreciation rights
 
736,717

 
789,637

Market share units
 
469,000

 
205,000

    
St
Market Stock Units Valuation Assumptions [Table Text Block]
The assumptions used to value the MSUs granted during the six months ended June 30, 2013 were as follows:
 
 
 
For the Three Months Ended June 30, 2013
Volatility
 
57%
Risk-free interest rate
 
0.35%
Expected option life in years
 
2.84
Dividend yield