Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010
Component of income tax benefit (expense) in the consolidated statement of operations
Current federal income tax benefit	$ 16,500	$ 2,600	$ 6,500
Current state income tax benefit (expense)	3,600	(200)	500
Current income tax benefit	20,100	2,400	7,000
Deferred federal income tax benefit	0	0	0
Deferred state income tax benefit	0	0	0
Deferred income tax benefit	0	0	0
Federal income tax benefit	16,500	2,600	6,500
State income tax benefit	3,600	(200)	500
Income tax benefit	$ 20,100	$ 2,400	$ 7,000