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Basis of Presentation and Significant Accounting Policies (Basic and Diluted Earnings (Loss) Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Numerator:    
Net loss $ (12,458) $ (45,802)
Denominator:    
Basic and diluted average shares outstanding 79,401 77,090
Basic and diluted loss per share $ (0.16) $ (0.59)