Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Line of Credit Facility [Line Items]
Debt	$ 157,490,000	$ 135,451,000
Long-term Debt, Fiscal Year Maturity [Abstract]
2016	42,419,000
2017	111,071,000
2018	4,000,000
Total	157,490,000
Interest	11,600,000	4,000,000	$ 4,000,000
Interest costs capitalized related to construction and real estate development costs	11,600,000	3,800,000	$ 2,900,000
Restricted net assets	131,200,000
Real Estate Operations
Line of Credit Facility [Line Items]
Maximum borrowing capacity	232,600,000	134,500,000
Remaining borrowing capacity	$ 75,100,000	$ 87,300,000
Mortgages
Line of Credit Facility [Line Items]
Weighted average interest rate	6.40%	6.60%
No stated interest, payments through 2017 | Mortgages
Line of Credit Facility [Line Items]
Total mortgage debt	$ 1,935,000
Interest rate	0.00%
3% to 4.75% payments through 2017 | Mortgages
Line of Credit Facility [Line Items]
Total mortgage debt	$ 67,602,000	$ 52,379,000
3% to 4.75% payments through 2017 | Mortgages | Minimum
Line of Credit Facility [Line Items]
Interest rate	3.00%
3% to 4.75% payments through 2017 | Mortgages | Maximum
Line of Credit Facility [Line Items]
Interest rate	4.75%
5% to 5.5% payments through 2017 | Mortgages
Line of Credit Facility [Line Items]
Total mortgage debt	$ 7,639,000	$ 6,918,000
5% to 5.5% payments through 2017 | Mortgages | Minimum
Line of Credit Facility [Line Items]
Interest rate	5.00%
5% to 5.5% payments through 2017 | Mortgages | Maximum
Line of Credit Facility [Line Items]
Interest rate	5.50%
8% payments through 2018 | Mortgages
Line of Credit Facility [Line Items]
Total mortgage debt	$ 4,000,000
Interest rate	8.00%
8.5% payments through 2017 | Mortgages
Line of Credit Facility [Line Items]
Total mortgage debt	$ 74,710,000	$ 74,550,000
Interest rate	8.50%
8.5% payments through 2017 | Senior Notes
Line of Credit Facility [Line Items]
Debt issued		75,000,000
8.5% payments through 2017 | Senior Notes | Subsidiaries
Line of Credit Facility [Line Items]
Maximum allowed debt to tangible assets	45.00%
Maximum secured debt allowed	$ 75,000,000
Maximum secured debt to tangible assets ratio	30.00%
Maximum annual acquisition of unimproved real property allowed	$ 75,000,000
Maximum acquisition of unimproved real property over term of debt allowed	150,000,000
10% payments through 2017 | Mortgages
Line of Credit Facility [Line Items]
Total mortgage debt	$ 1,604,000	$ 1,604,000
Interest rate	10.00%