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Reporting Segments and Related Information - Reconciliation of Revenues, Segment Profits (Losses) and Net Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues |  |  |
Segment revenues | $ 35,657 | $ 45,577 | $ 51,147
Equity in earnings (losses) | 4,227 | 7,098 | 6,324
Gain on sale of real estate | 0 | 1,044 | 0
Investment income | 462 | 457 | 528
Other income | 153 | 158 | 381
Total revenues and other income | 40,499 | 54,334 | 58,380
Segment profits (losses) and net income (loss) |  |  |
Segment profits | (7,544) | (7,906) | (3,196)
Costs and expenses | (43,201) | (53,483) | (54,343)
(Loss) income before income taxes | (2,702) | 851 | 4,037
Ranch operations |  |  |
Segment profits (losses) and net income (loss) |  |  |
Costs and expenses | (5,411) | (5,734) | (6,112)
Operating Segments |  |  |
Revenues |  |  |
Segment revenues | 35,657 | 45,577 | 51,147
Segment profits (losses) and net income (loss) |  |  |
Segment profits | 2,597 | 4,644 | 9,612
Operating Segments | Real estate - commercial/industrial |  |  |
Revenues |  |  |
Segment revenues | 9,403 | 9,438 | 8,272
Segment profits (losses) and net income (loss) |  |  |
Segment profits | 2,874 | 2,338 | 1,578
Costs and expenses | (6,529) | (7,100) | (6,694)
Operating Segments | Real estate - resort/residential |  |  |
Segment profits (losses) and net income (loss) |  |  |
Segment profits | (1,955) | (1,630) | (2,349)
Operating Segments | Mineral resources |  |  |
Revenues |  |  |
Segment revenues | 5,983 | 14,153 | 15,116
Segment profits (losses) and net income (loss) |  |  |
Segment profits | 3,019 | 6,357 | 7,720
Costs and expenses | (2,964) | (7,796) | (7,396)
Operating Segments | Farming |  |  |
Revenues |  |  |
Segment revenues | 16,434 | 18,648 | 23,836
Segment profits (losses) and net income (loss) |  |  |
Segment profits | 233 | (25) | 4,852
Costs and expenses | (16,201) | (18,673) | (18,984)
Operating Segments | Ranch operations |  |  |
Revenues |  |  |
Segment revenues | 3,837 | 3,338 | 3,923
Segment profits (losses) and net income (loss) |  |  |
Segment profits | (1,574) | (2,396) | (2,189)
Corporate |  |  |
Segment profits (losses) and net income (loss) |  |  |
Costs and expenses | $ (10,141) | $ (12,550) | $ (12,808)

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