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Stock-Based Compensation (Details) (USD $)
 6 Months Ended
May 31, 2012
Stock options outstanding and stock options exercisable  
Options outstanding at beginning of period, Options 10,160,396
Options outstanding at beginning of period, Weighted Average Exercise Price $ 21.27
Granted, Options 30,000
Granted, Weighted Average Exercise Price $ 9.08
Exercised, Options 0
Exercised, Weighted Average Exercise Price $ 0.00
Cancelled, Options (7,000)
Cancelled, Weighted Average Exercise Price $ 20.95
Options outstanding at end of period, Options 10,183,396
Options outstanding at end of period, Weighted Average Exercise Price $ 21.24
Options exercisable at end of period, options 7,240,732
Options exercisable at end of period, Weighted Average Exercise Price $ 26.27