Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011
Income tax benefit computed at the statutory U.S. federal income tax rate and income tax benefit (expense) provided in the consolidated statements of operations
Income tax benefit computed at statutory rate	$ (13,427)	$ 27,672	$ 63,397
Increase (decrease) resulting from
State taxes, net of federal income tax benefit	(1,947)	9,948	4,691
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Amount	1,808	9,146	1,161
Capitalized expenses	0	7,960	(3,501)
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount	9,598	(42,503)	(4,401)
NOLs reconciliation	(3,806)	(5,345)	715
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount	2,827	(59,401)	(1,852)
Recognition of federal tax benefits	1,600	17,650	2,600
Tax credits	2,675	17,889	5,477
Valuation allowance for deferred tax assets	20,673	(32,286)	(76,747)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation, Amount	4,523	2,482	0
Other, net	(112)	174	4,380
Income tax benefit	1,600	20,100	2,400
Reconciliation of the beginning and ending balances of the gross unrecognized benefits
Balance at beginning of year	1,671	1,899	11,308
Additions for tax positions related to prior years	0	0	5
Reductions for tax positions related to prior years	0	(165)	0
Reductions due to lapse of statute of limitations	(1,465)	(63)	(2,476)
Reductions due to resolution of federal and state audits	0	0	(6,938)
Balance at the end of year	$ 206	$ 1,671	$ 1,899