Proposed Land Sale (Details) (USD $)		0 Months Ended		0 Months Ended
	Sep. 30, 2013 acre	Nov. 06, 2013 Subsequent event acre	Oct. 31, 2013 Subsequent event	Nov. 06, 2013 Subsequent event Maximum
Subsequent Event [Line Items]
Proposed land sale, area of land (in acres)	567,000	382,834
Proposed land sale, purchase price		$ 565,000,000
Proposed land sale, deposit amount		37,500,000.0
Proposed land sale, period to secure line of credit		20 days
Proposed land sale, carrying amount of assets to be sold, net			54,000,000
Proposed land sale, area of land remaining aer sale (in acres)		184,000
Proposed land sale, purchase price reduction				40,000,000
Proposed land sale, termination fee		21,000,000
Proposed land sale, reimburseable costs and expenses upon termination				$ 1,500,000.0