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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company has evaluated subsequent events through the date on which this Form 10-K was filed, the date on which these financial statements were issued, and identified the items below for discussion. In January and February 2018, the Company acquired four parcels of land for development for an aggregate investment of $76,758,000. In February 2018, the Company repaid $15,174,000 of 6.60% fixed rate debt secured by Avalon Oaks West in advance of its maturity date, incurring a prepayment penalty of $152,000.