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Basis of Presentation and Significant Accounting Policies (Basic and Diluted Loss Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Nov. 30, 2013
Aug. 31, 2013
May 31, 2013
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2012
May 31, 2012
Feb. 29, 2012
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2011
Numerator:                      
Net loss $ 28,116 $ 27,278 $ (2,973) $ (12,458) $ 7,724 $ 3,261 $ (24,136) $ (45,802) $ 39,963 $ (58,953) $ (178,768)
Less: Distributed earnings allocated to nonvested restricted stock                 24 0 0
Less: Undistributed earnings allocated to nonvested restricted stock                 90 0 0
Net Income (Loss) Available to Common Stockholders, Basic                 39,849 (58,953) (178,768)
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes                 2,230 0 0
Undistributed Earnings Reallocated to Participating Securities                 81 0 0
Net Income (Loss) Available to Common Stockholders, Diluted                 $ 42,088 $ (58,953) $ (178,768)
Weighted Average Number of Shares Outstanding, Basic                 82,630 77,106 77,043
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements                 1,885 0 0
Convertible senior notes, shares                 7,044 0 0
Weighted Average Number of Shares Outstanding, Diluted                 91,559 77,106 77,043
Earnings (Loss) Per Share, Basic, in dollars per share $ 0.33 $ 0.32 $ (0.04) $ (0.16) $ 0.10 $ 0.04 $ (0.31) $ (0.59) $ 0.48 $ (0.76) $ (2.32)
Earnings (Loss) Per Share, Diluted, in dollars per share $ 0.31 $ 0.30 $ (0.04) $ (0.16) $ 0.10 $ 0.04 $ (0.31) $ (0.59) $ 0.46 $ (0.76) $ (2.32)