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Reporting Segments and Related Information - Revenue Components of Real Estate Segments (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue from External Customer [Line Items]        
Segment revenues   $ 35,657 $ 45,577 $ 51,147
Equity in earnings of unconsolidated joint ventures, net   4,227 7,098 6,324
Proceeds from sale of building and land $ 4,700      
Gain recognized on sale of building and land $ 1,044      
Segment profits   7,544 7,906 3,196
Operating Segments        
Revenue from External Customer [Line Items]        
Segment revenues   35,657 45,577 51,147
Segment profits   (2,597) (4,644) (9,612)
Operating Segments | Real estate - commercial/industrial        
Revenue from External Customer [Line Items]        
Segment revenues   9,403 9,438 8,272
Revenues and Income (Loss) from Equity Method Investments   13,630 16,536 14,596
Segment profits   (2,874) (2,338) (1,578)
Operating Segments | Real estate - commercial/industrial | Pastoria Energy Facility Lease        
Revenue from External Customer [Line Items]        
Segment revenues   3,854 3,612 3,694
Operating Segments | Real estate - commercial/industrial | TRCC Leasing        
Revenue from External Customer [Line Items]        
Segment revenues   1,748 1,647 1,421
Operating Segments | Real estate - commercial/industrial | TRCC management fees and reimbursements        
Revenue from External Customer [Line Items]        
Segment revenues   1,083 955 786
Operating Segments | Real estate - commercial/industrial | Commercial leases        
Revenue from External Customer [Line Items]        
Segment revenues   652 917 851
Operating Segments | Real estate - commercial/industrial | Communication leases        
Revenue from External Customer [Line Items]        
Segment revenues   808 806 784
Operating Segments | Real estate - commercial/industrial | Landscaping and other        
Revenue from External Customer [Line Items]        
Segment revenues   783 791 736
Operating Segments | Real estate - commercial/industrial | Land Sale        
Revenue from External Customer [Line Items]        
Segment revenues   475 710 0
Operating Segments | Real estate - resort/residential        
Revenue from External Customer [Line Items]        
Segment profits   $ 1,955 $ 1,630 $ 2,349