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Earnings Per Share (Basic and Diluted Loss Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Nov. 30, 2015	Aug. 31, 2015	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2013
Numerator:
Net income (loss)	$ 44,017	$ 23,254	$ 9,573	$ 7,799	$ 852,801	$ 28,361	$ 26,624	$ 10,563	$ 84,643	$ 918,349	$ 39,963
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic									(33)	(26)	(24)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic									(273)	(2,667)	(90)
Numerator for basic earnings per share									84,337	915,656	39,849
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes									2,667	2,667	2,230
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted									273	2,667	90
Less: Undistributed earnings reallocated to nonvested restricted stock									(244)	(2,398)	(81)
Numerator for diluted earnings per share									$ 87,033	$ 918,592	$ 42,088
Denominator:
Weighted average shares outstanding — basic									92,054	89,265	82,630
Share-based payments, shares									2,401	1,647	1,885
Convertible senior notes, shares									8,402	8,402	7,044
Weighted average shares outstanding — diluted									102,857	99,314	91,559
Basic earnings (loss) per share, in dollars per share	$ 0.48	$ 0.25	$ 0.10	$ 0.08	$ 9.25	$ 0.31	$ 0.30	$ 0.13	$ 0.92	$ 10.26	$ 0.48
Diluted earnings (loss) per share, in dollars per share	$ 0.43	$ 0.23	$ 0.10	$ 0.08	$ 8.36	$ 0.28	$ 0.27	$ 0.12	$ 0.85	$ 9.25	$ 0.46

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