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Earnings (Loss) Per Share (Basic and Diluted Earnings (Loss) Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Numerator:    
Net income (loss) $ 10,563 $ (12,458)
Less: Distributed earnings allocated to nonvested restricted stock (5) 0
Less: Undistributed earnings allocated to nonvested restricted stock (22) 0
Numerator for basic earnings (loss) per share 10,536 (12,458)
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes 667 0
Add: Undistributed earnings allocated to nonvested restricted stock 22 0
Less: Undistributed earnings reallocated to nonvested restricted stock (20) 0
Numerator for diluted earnings (loss) per share $ 11,205 $ (12,458)
Denominator:    
Weighted Average Number of Shares Outstanding, Basic 83,745 79,401
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 1,799 0
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 8,402 0
Weighted Average Number of Shares Outstanding, Diluted 93,946 79,401
Earnings Per Share, Basic, in dollars per share $ 0.13 $ (0.16)
Earnings Per Share, Diluted, in dollars per share $ 0.12 $ (0.16)