Mortgages and Notes Receivable (Details) (USD $)	3 Months Ended			3 Months Ended	12 Months Ended		3 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Seller Financing [Member]	Dec. 31, 2010 Seller Financing [Member] transactions	Dec. 31, 2013 Seller Financing [Member]	Mar. 31, 2014 Mortgage Receivable [Member]	Dec. 31, 2013 Mortgage Receivable [Member]	Dec. 31, 2012 Mortgage Receivable [Member]	Mar. 31, 2014 Promissory Notes [Member]	Mar. 31, 2013 Promissory Notes [Member]	Dec. 31, 2013 Promissory Notes [Member]
Schedule of mortgages and notes receivable [Abstract]
Mortgages and notes receivable, gross				$ 0		$ 16,454,000	$ 9,658,000	$ 9,435,000		$ 670,000		$ 822,000
Mortgages and notes receivable, allowance	(300,000)			0			0			(300,000)	(437,000)
Mortgages and notes receivable, net	10,028,000		26,409,000	0		16,454,000	9,658,000	9,435,000		370,000		520,000
Number of transactions with seller financing					2
Repayment of seller financing	16,604,000	0		16,500,000
Deferred gain on sale of real estate				400,000
Additional loan commitment to third party									8,400,000
Cumulative funds for future infrastructure disbursed to third party							400,000
Notes receivable allowance, promissory notes [Roll Forward]
Beginning notes receivable allowance	302,000			0			0			302,000	182,000
Recoveries/write-offs/other										(2,000)	255,000
Total notes receivable allowance	$ 300,000			$ 0			$ 0			$ 300,000	$ 437,000