Business Segments - Revenue Components of Real Estate Segments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue from External Customer [Line Items]
Commercial/industrial revenues	$ 6,849	$ 7,000	$ 19,802	$ 23,633
Equity in earnings of unconsolidated joint ventures, net	1,842	1,656	3,297	2,806
Net income from commercial/industrial and unconsolidated joint ventures	(1,108)	413	699	2,876
Operating Segments \| Real estate - commercial/industrial
Revenue from External Customer [Line Items]
Commercial/industrial revenues	2,159	1,810	4,313	4,089
Equity in earnings of unconsolidated joint ventures, net		1,656		2,806
Total commercial/industrial revenues and equity in earnings from unconsolidated joint ventures	4,001	3,466	7,610	6,895
Net income from commercial/industrial and unconsolidated joint ventures	2,287	1,790	4,217	3,610
Operating Segments \| Real estate - commercial/industrial \| Pastoria Energy Facility Lease
Revenue from External Customer [Line Items]
Commercial/industrial revenues	860	894	1,731	1,792
Operating Segments \| Real estate - commercial/industrial \| Commercial leases
Revenue from External Customer [Line Items]
Commercial/industrial revenues	912	717	1,806	1,401
Operating Segments \| Real estate - commercial/industrial \| Communication leases
Revenue from External Customer [Line Items]
Commercial/industrial revenues	198	187	394	392
Operating Segments \| Real estate - commercial/industrial \| Landscaping and other
Revenue from External Customer [Line Items]
Commercial/industrial revenues	$ 189	$ 12	$ 382	$ 504

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No definition available.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=51673353&loc=d3e41242-110953

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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-Paragraph 10
-Article 5

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.12)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 11
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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