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Stock-Based Compensation (Tables)
 6 Months Ended
May 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Outstanding and Exercisable Stock Options
The following table summarizes stock option transactions for the six months ended May 31, 2014:
 
Options
 
Weighted
Average Exercise
Price
Options outstanding at beginning of period
10,531,938

 
$
21.11

Granted
—

 
—

Exercised
(10,000
)
 
6.32

Cancelled
(5,747
)
 
35.39

Options outstanding at end of period
10,516,191

 
$
21.12

Options exercisable at end of period
9,409,188

 
$
22.25