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Subsequent Events (Details) (Land, USD $)
In Millions, unless otherwise specified
Aug. 31, 2013
acre
Sep. 06, 2013
Subsequent events
Windsor undeveloped land sale
Scenario forecast
acre
Subsequent events    
Area of land for sale (in acres)   90
Sale price   $ 9.0
Area of land portion of which is to be sold (in acres) 268