Business Segments - Revenue Components of Real Estate Segments (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue from External Customer [Line Items]
Segment revenues	$ 51,147	$ 51,069	$ 45,000
Equity in earnings of unconsolidated joint ventures, net	6,324	5,294	4,006
Segment losses	54,343	49,126	44,162
Operating Segments \| Real estate - commercial/industrial
Revenue from External Customer [Line Items]
Segment revenues	8,272	7,845	7,455
Equity in earnings of unconsolidated joint ventures, net	6,324	5,294	4,006
Revenues and Income (Loss) from Equity Method Investments	14,596	13,139	11,461
Segment losses	6,694	7,206	6,853
Operating Segments \| Real estate - commercial/industrial \| PEF lease
Revenue from External Customer [Line Items]
Segment revenues	3,694	3,445	4,195
Operating Segments \| Real estate - commercial/industrial \| Commercial leases
Revenue from External Customer [Line Items]
Segment revenues	2,830	1,845	1,770
Operating Segments \| Real estate - commercial/industrial \| Communication leases
Revenue from External Customer [Line Items]
Segment revenues	784	782	787
Operating Segments \| Real estate - commercial/industrial \| Other leases
Revenue from External Customer [Line Items]
Segment revenues	105	84	46
Operating Segments \| Real estate - commercial/industrial \| Landscaping and other
Revenue from External Customer [Line Items]
Segment revenues	859	1,181	657
Operating Segments \| Real estate - commercial/industrial \| Land Sale
Revenue from External Customer [Line Items]
Segment revenues	0	508	0
Operating Segments \| Real estate - resort/residential
Revenue from External Customer [Line Items]
Segment losses	$ 2,349	$ 2,608	$ 2,231

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Total costs of sales and operating expenses for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 225
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