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Business Segments - Revenue Components of Real Estate Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Revenue from External Customer [Line Items] |  |
Segment revenues | $ 12,953 | $ 16,633
Equity in earnings of unconsolidated joint ventures, net | 1,455 | 1,150
Real estate - commercial/industrial |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | 2,154 | 2,279
Operating Segments | Real estate - commercial/industrial |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | 2,154 | 2,279
Equity in earnings of unconsolidated joint ventures, net | 1,455 | 1,150
Income from commercial/industrial and unconsolidated joint ventures | 1,930 | 1,820
Operating Segments | Real estate - commercial/industrial | Pastoria Energy Facility Lease |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | 871 | 898
Operating Segments | Real estate - commercial/industrial | Commercial leases |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | 894 | 684
Operating Segments | Real estate - commercial/industrial | Communication leases |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | 196 | 205
Operating Segments | Real estate - commercial/industrial | Landscaping and other |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | $ 193 | $ 492

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