Commitments and Contingencies Commitments and Contingencies (Narrative) (Details) (District of Maryland [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	80 Months Ended
	Feb. 28, 2015	Jan. 22, 2015	Nov. 30, 2008	Nov. 30, 2005
Land [Member]
Loss Contingencies [Line Items]
Land purchase commitment	$ 114,000		$ 134,000	$ 200,000
Land purchase commitment, deposit				20,000
Loss Contingency, Damages Sought, Interest Rate		12.00%
Interest Expense [Domain]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value		91,100
Loss Contingency, Annual Interest Amount	13,680
Real estate property taxes [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value		$ 1,600