Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2009
Component of income tax benefit (expense) in the consolidated statement of operations
Current Federal income tax expense	$ 2,600	$ 6,500	$ 207,900
Current State income tax expense	(200)	500	1,500
Current Income Tax Expense	2,400	7,000	209,400
Deferred federal income tax expense	0	0	0
Deferred state income tax expense	0	0	0
Deferred Income Tax Expense	0	0	0
Federal Income Tax Expense	2,600	6,500	207,900
State and Local Income Tax Expense	(200)	500	1,500
Income tax benefit	$ 2,400	$ 7,000	$ 209,400