Income Taxes (Details Textual) (USD $)	12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011
Income Tax Contingency [Line Items]
Accumulated Deferred Investment Tax Credit	$ 7,800,000
Income Taxes (Textual) [Abstract]
Income tax benefit	1,600,000	20,100,000	2,400,000
Income Taxes Receivable, Current	1,400,000
Provision for deferred income taxes	0	1,152,000	0
Deferred Tax Assets, Net	0	0
Reversal of liability for Unrecognized tax benefits	1,000,000		2,600,000
State and Local Income Tax Expense (Benefit), Continuing Operations	800,000
Net Increase in valuation allowance recorded against net deferred tax assets	20,700,000	(32,300,000)	(76,700,000)
Period for Carry forward of tax benefits related to deferred tax assets	20 years
Deferred tax assets, operating loss carryforwards, federal	329,000,000
Deferred tax assets, operating loss carryforwards, state and local	130,900,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local, Expired	3,500,000
Deferred Tax Assets, Tax Credit Carryforwards	84,400,000
Valuation allowance	(859,440,000)	(880,113,000)
Unrecognized tax benefits that if recognized would affect the Company's annual effective tax rate	300,000	1,300,000	1,800,000
Total accrued interest and penalties related to unrecognized income tax benefits	300,000	600,000
Uncertain tax positions	200,000	1,000,000
Income taxes refunded	61,000	22,342,000	213,000
Valuation allowance against net deferred tax assets	859,440,000	880,113,000
Total deferred tax assets	150,991,000	140,907,000
Unrecognized Tax Benefits	500,000
Maximum
Income Tax Contingency [Line Items]
Anticipated Decrease in unrecognized tax benefit during 12 months following current reporting date	300,000
Income Taxes (Textual) [Abstract]
Minimum expiration period for state NOLs	2033
Tax Credit Expiration Date Minimum	2033
Minimum
Income Tax Contingency [Line Items]
Anticipated Decrease in unrecognized tax benefit during 12 months following current reporting date	100,000
Income Taxes (Textual) [Abstract]
Minimum expiration period for state NOLs	2014
Tax Credit Expiration Date Minimum	2015
Investment Tax Credit Carryforward, Expiration in 2026 [Member]
Income Tax Contingency [Line Items]
Accumulated Deferred Investment Tax Credit	7,000,000
Investment Tax Credit Carryforward, Expiration in 2027 [Member]
Income Tax Contingency [Line Items]
Accumulated Deferred Investment Tax Credit	$ 800,000