Mortgages and Notes Receivable (Details) (USD $)	12 Months Ended					12 Months Ended
	Dec. 31, 2013 acre	Dec. 31, 2012	Dec. 31, 2010 Seller Financing [Member] transactions	Dec. 31, 2013 Seller Financing [Member]	Dec. 31, 2012 Seller Financing [Member]	Dec. 31, 2013 Mortgage Receivable [Member]	Dec. 31, 2012 Mortgage Receivable [Member] acre	Dec. 31, 2013 Promissory Notes [Member]	Dec. 31, 2012 Promissory Notes [Member]
Mortgages and Notes Receivable, Net [Abstract]
Mortgages and notes receivable, gross				$ 16,454,000	$ 15,853,000	$ 9,435,000	$ 8,648,000	$ 822,000	$ 1,153,000
Mortgages and notes receivable, allowance	(302,000)	(182,000)		0	0	0	0	(302,000)	(182,000)
Mortgages and notes receivable, net	26,409,000	25,472,000		16,454,000	15,853,000	9,435,000	8,648,000	520,000	971,000
Number of transactions with seller financing			2
Acquisition of development land (in acres)							77
Undeveloped land suitable for future development (in acres)	600						68
Mortgage receivable, maturity date							Dec. 01, 2015
Mortgage receivable, current interest rate (in hundredths)							5.00%
Term of optional extension							3 years
Additional loan commitment to third party							8,400,000
Cumulative funds for future infrastructure disbursed to third party						300,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning notes receivable allowance	182,000	61,000		0	0	0		302,000	182,000
Bad debt expense	0	186,000
Recoveries/write-offs/other	120,000	(65,000)
Total notes receivable allowance	$ 302,000	$ 182,000		$ 0	$ 0	$ 0	$ 0	$ 302,000	$ 182,000